Journal articles: 'Nanophosphors'

1

Das, Antika, Subhajit Saha, Karamjyoti Panigrahi, Uttam Kumar Ghorai, and Kalyan Kumar Chattopadhyay. "Enhanced Photoluminescence Properties of Low-Dimensional Eu3+-Activated Y4Al2O9 Phosphor Compared to Bulk for Solid-State Lighting Applications and Latent Fingerprint Detection-Based Forensic Applications." Microscopy and Microanalysis 25, no. 6 (April 26, 2019): 1422–30. http://dx.doi.org/10.1017/s143192761900028x.

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AbstractIn recent years, nanoscale phosphors have become vital in optoelectronic applications and to understand the improved performance of nanophosphors over bulk material, detailed investigation is essential. Herein, trivalent europium-activated Y4Al2O9 phosphors were developed by solid-state reaction and solvothermal reaction methods and their performance as a function of their dimension was studied for various applications. Under 394 nm optical excitation, the photoluminescence (PL) emission, excited state lifetime of the nanophosphor, exhibits greater performance than its bulk counterpart. The homogeneous spherical structure of the nanophosphors as compared with solid lumps of bulk phosphors is the basis for almost 40% of the enhancement in nanophosphors' intense red emission compared to the bulk. Moreover, the thermal stability of the nanophosphor is much better than the bulk phosphor, which clearly indicates a key advantage of nanophosphor. The superior performance of Eu3+-doped Y4Al2O9 nanophosphors over their bulk counterparts has been demonstrated for industrial phosphor-converted light-emitting diodes and visualization of latent fingerprint.

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Kurrey, Manmohan Singh, and Bhoopendra Dhar Diwan. "Photo-Luminescence Properties of Novel ZnO Nano-Phosphors." Advanced Materials Research 938 (June 2014): 311–15. http://dx.doi.org/10.4028/www.scientific.net/amr.938.311.

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In this paper we have reported excellent luminescence properties of novel nanophosphors synthesized through solgel method with narrow size distribution. The size and morphology of the prepared ZnO nanophosphors has been confirmed through XRD and SEM. We have investigated their photo-luminescence (PL) intensity as a function of wavelength. We have prepared ZnO nanophosphor of size 6 nm. It is observed two different emission peaks near 375 nm in the ultraviolet (UV) and near 525 nm in the visible region. The prepared ZnO nanophosphor has enough potential for optoelectronic applications. Keywords: Dosimetry; Thermo-luminescence; Zinc oxide; Nanophosphors.

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Chatterjee, Rituparna, Subhajit Saha, Karamjyoti Panigrahi, Uttam Kumar Ghorai, Gopes Chandra Das, and Kalyan Kumar Chattopadhyay. "Blue Emitting BaAl2O4:Ce3+ Nanophosphors with High Color Purity and Brightness for White LEDs." Microscopy and Microanalysis 25, no. 6 (September 26, 2019): 1466–70. http://dx.doi.org/10.1017/s1431927619014958.

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AbstractIn this work, strongly blue emitting Ce3+-activated BaAl2O4 nanophosphors were successfully synthesized by a sol–gel technique. The crystal structure, morphology, and microstructure of the nanophosphors have been studied by X-ray powder diffraction, field emission scanning electron microscopy, and high-resolution transmission electron microscopy. The photoluminescence spectra show the impact of concentration variation of Ce3+ on the photoluminescence emission of the phosphor. These nanophosphors display intense blue emission peaking at 422 nm generated by the Ce3+ 5d → 4f transition under 350 nm excitation. Our results reveal that this nanophosphor has the capability to take part in the emergent domain of solid-state lighting and field-emission display devices.

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Polyakov, Vladimir, Zaira Gadzhimagomedova, Daria Kirsanova, and Alexander Soldatov. "Synthesis Optimization of BaGdF5:x%Tb3+ Nanophosphors for Tunable Particle Size." Materials 15, no. 23 (December 1, 2022): 8559. http://dx.doi.org/10.3390/ma15238559.

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X-ray photodynamic therapy (XPDT) is aimed at the treatment of deep-located malignant tumors thanks to the high penetration depth of X-rays. In XPDT therapy, it is necessary to use materials that effectively absorb X-rays and convert them into visible radiation-nanophosphors. Rare-earth elements, fluorides, in particular, doped BaGdF5, are known to serve as efficient nanophosphor. On the other hand, the particle size of nanophosphors has a crucial impact on biodistribution, cell uptake, and cytotoxicity. In this work, we investigated various Tb:Gd ratios in the range from 0.1 to 0.5 and optimized the terbium content to achieve the maximum luminescence under X-ray excitation. The effect of temperature, composition of the ethylene glycol/water solvent, and the synthesis technique (solvothermal and microwave) on the size of the nanophosphors was explored. It was found that the synthesis techniques and the solvent composition had the greatest influence on the averaged particle size. By varying these two parameters, it is possible to tune the size of the nanophosphor particles, which make them suitable for biomedical applications.

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Park, Je Hong, Sung Hoon Lee, Jong Su Kim, Tae Wan Kim, and Hong Lee Park. "Comparative Analysis of ZnS:Mn²⁺ Nanophosphors Prepared by Hydrothermal and Low Temperature Precipitation Methods." Solid State Phenomena 128 (October 2007): 53–58. http://dx.doi.org/10.4028/www.scientific.net/ssp.128.53.

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Manganese-doped ZnS nanophosphors were synthesized by two different methods: hydrothermal and low-temperature precipitation methods. The nanophosphors prepared by the hydrothermal precipitation and low-temperature methods had the size of 20 nm and 4 nm, respectively, and both were the cubic phase. The emission intensity of the nanophosphor prepared by the hydrothermal method was optimized at 10 mole % of Mn2+ concentration whereas that by low-temperature precipitation method was optimized at 3 mole % of Mn2+. The precipitationprepared nanophosphor, of size 4nm, showed a blueshift in the excitation spectrum and a redshift in the emission spectrum compared to the hydrothermal-prepared 20 nm nanophosphor. These phenomena can be explained in terms of the quantum confinement effect. The decay times especially were lengthened with decreasing particle size. This can be explained in terms of the variation in the transition probability induced from the quantum confinement effect.

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Hyun, Jae-Young, Ki-Hyun Kim, Jae-Pil Kim, Won-Bin Im, Kadathala Linganna, and Ju-Hyeon Choi. "Enhancement of Luminescence Efficiency of Y2O3 Nanophosphor via Core/Shell Structure." Nanomaterials 11, no. 6 (June 14, 2021): 1563. http://dx.doi.org/10.3390/nano11061563.

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We successfully fabricated Y2O3:RE3+ (RE = Eu, Tb, and Dy) core and core–shell nanophosphors by the molten salt method and sol–gel processes with Y2O3 core size of the order of 100~150 nm. The structural and morphological studies of the RE3+-doped Y2O3 nanophosphors are analyzed by using XRD, SEM and TEM techniques, respectively. The concentration and annealing temperature dependent structural and luminescence characteristics were studied for Y2O3:RE3+ core and core–shell nanophosphors. It is observed that the XRD peaks became narrower as annealing temperature increased in the core–shell nanophosphor. This indicates that annealing at higher temperature improves the crystallinity which in turn enhances the average crystallite size. The emission intensity and quantum yield of the Eu3+-doped Y2O3 core and core–shell nanoparticles increased significantly when annealing temperature is varied from 450 to 550 °C. No considerable variation was noticed in the case of Y2O3:Tb3+ and Y2O3:Dy3+ core and core–shell nanophosphors.

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7

Evstropiev, S. K., V. V. Demidov, D. V. Bulyga, R. V. Sadovnichii, G. A. Pchelkin, D. N. Shurupov, Yu F. Podrukhin, A. S. Matrosova, N. V. Nikonorov, and K. V. Dukelskii. "YAG : R³⁺ (R = Ce, Dy, Yb) nanophosphor-based luminescent fibre-optic sensors for temperature measurements in the range 20 – 500 °C." Quantum Electronics 52, no. 1 (January 1, 2022): 94–99. http://dx.doi.org/10.1070/qel17971.

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Abstract We report the development of a group of luminescent fibre-optic temperature sensors that use Ce3+-, Dy3+-, and Yb3+- doped yttrium aluminium garnet (YAG) nanophosphors as thermosensitive materials. The nanophosphors have been prepared in the form of powders with a crystallite size from 19 to 27 nm by a polymer – salt method and exhibit bright luminescence at 550 (YAG : Ce3+), 400, 480 (YAG : Dy3+), and 1030 nm (YAG : Yb3+). The sensor design includes a silica capillary, partially filled with a nanophosphor, and two large-aperture multimode optical fibres located in the capillary, which deliver excitation light and receive and transmit the photoluminescence signal. The photoluminescence signal amplitude of all the sensors decreases exponentially with increasing temperature, pointing to characteristic thermal quenching of photoluminescence and adequate operation of the devices up to 500 °C. The highest temperature sensitivity among the fibre-optic sensors is offered by the YAG : Ce3+ nanophosphor-based devices.

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8

Koneru, Girija Venkateswara, Venkata Nagendra Kumar Putta, and Sirisha Bandi. "Hydrothermal Synthesis, Structural Analysis and Photoluminescence Study of Nd3+/Ho3+ Doped Nanophosphors." Oriental Journal Of Chemistry 40, no. 1 (February 25, 2024): 49–54. http://dx.doi.org/10.13005/ojc/400106.

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Through photoluminescence (PL) investigations, this work shows that the hydrothermal technique of nanomaterial synthesis can successfully produce GdPO4:Nd3+/Ho3+ nanophosphors that display luminescence properties. Down-conversion peaks that produce green and red light arise at certain wavelengths (465, 550, and 674 nm) in response to stimulation at 300 nm. The analysis indicates the P-O CT band of Ho3+ ions and non-radiative resonance energy transfer, which boosts Ho3+ ion emission. GdPO4:Nd3+/Ho3+, an up-conversion (UC) nanophosphor, exhibits efficient luminescence output, with Ho3+ ions being attributed to distinct peaks in the up-conversion emission spectra (465 nm, 550 nm, and 674 nm). Nd3+ ions under strong 808 nm laser irradiation promote these peaks. The study produces well-crystalline nanoparticles with diameters ranging from a few nanometers to tens of nanometers by using the hydrothermal synthesis approach. Under PLE tests, the nanophosphors show an impressive quantum yield, suggesting a wide range of possible uses in the field of nanophosphor materials.

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Peng, Ling Ling, Bi Tao Liu, Ying Deng, and Tao Han. "Effects of the Sr/Si Ratio on the Photoluminescence Properties of Sr₃SiO₅:Eu²⁺ Nanophosphors." Applied Mechanics and Materials 341-342 (July 2013): 225–28. http://dx.doi.org/10.4028/www.scientific.net/amm.341-342.225.

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Sr3SiO5:Eu2+ nanophosphors for white LEDs were synthesized by solgel method. The crystalline phases were examined with X-ray diffraction (XRD). Luminescence properties were studied, and effects of the Sr/Si ratio on the emission spectra were also studied. The nanophosphor showed a broad excitation band from 300 to 500 nm and a broad band emission peaking at 593 nm due to the typical electron transition of Eu2+ 4f74f65d1. Remarkable enhancement in luminescence characteristics was observed when excesses silica was used. This phenomenon may be attributed to the improvement of Si sensitized the luminescence of Eu2+ in the Sr3SiO5 nanophosphor.

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10

Wu, Mihye, Hyemin Park, Eun Gyu Lee, Sanghun Lee, Yu Jin Hong, and Sungho Choi. "Luminescence Quenching Behavior of Hydrothermally Grown YVO4:Eu3+ Nanophosphor Excited under Low Temperature and Vacuum Ultra Violet Discharge." Materials 13, no. 15 (July 23, 2020): 3270. http://dx.doi.org/10.3390/ma13153270.

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The luminescence quenching behavior and energy transfer process in hydrothermally grown Eu3+-doped YVO4 nanophosphors were studied using low temperature photoluminescence spectroscopy. The luminescence efficiency of nanophosphor is dependent on the acidity of its solution media and the post annealing condition after hydrothermal processing. The overall results suggest that the abnormal luminescence behavior of Eu3+-doped nanocrystalline YVO4 under low temperature photoexcitation is due to the incorporated non-radiative hydroxyl groups often encountered in hydrothermal synthesis as well as to the inefficient energy transfer to luminescent ions from vanadate groups.

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11

Brini, Layla, Hanen Douiri, Marwa Abid, Alessandra Toncelli, Montasir Qasymeh, Ramzi Maalej, and Mohamed Abdelhedi. "Potential of Y2Sn2O7:Eu3+, Dy3+ Inorganic Nanophosphors in Latent Fingermark Detection." Crystals 14, no. 4 (March 24, 2024): 300. http://dx.doi.org/10.3390/cryst14040300.

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In this work, we investigated the potential of Eu3+/Dy3+-codoped Y2Sn2O7 fluorescent nanophosphors to visualize latent fingermarks. We prepared these nanophosphors with various doping concentrations by the conventional coprecipitation reaction. The crystal structure, morphology, luminescence properties, and energy transfer mechanisms were studied. The crystalline phase was characterized by X-ray diffraction and crystal structure refinement using the Rietveld method. XRD measurements showed that the samples crystallized in the pure single pyrochlore phase with few more peaks originated from secondary phases and impurities generated during phosphor production, and that Eu3+ ions occupied D3d symmetry sites. The average crystallite size after mechanical grinding was less than 100 nm for all compositions. The optical characterization showed that, when excited under 532 nm, the Eu3+/Dy3+-codoped Y2Sn2O7 samples’ main intense emission peaks were located at 580–707 nm, corresponding to the 5D0→7Fj (j = l, 2, 3, and 4) transitions of europium. In fact, the 5D0→7F2 hypersensitive transition is strongly dependent on the local environment and was quite weak in Eu3+:Y2Sn2O7 at low Eu3+ doping levels. We found that the presence of Dy3+ as a codopant permitted enhancing the emission from this transition. The calculated PL CIE coordinates for the synthesized nanophosphors were very close to those of the reddish-orange region and only slightly dependent on the doping level. Various surfaces, including difficult ones (wood and ceramic), were successfully tested for latent fingerprint development with the prepared Eu3+/Dy3+-codoped Y2Sn2O7 fluorescent nanophosphor powder. Thanks to the high contrast obtained, fingerprint ridge patterns at all three levels were highlighted: core (level 1) islands, bifurcation, and enclosure (level 2), and even sweat pores (level 3).

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12

Gadzhimagomedova, Zaira, Vladimir Polyakov, Ilia Pankin, Vera Butova, Daria Kirsanova, Mikhail Soldatov, Darya Khodakova, et al. "BaGdF5 Nanophosphors Doped with Different Concentrations of Eu3+ for Application in X-ray Photodynamic Therapy." International Journal of Molecular Sciences 22, no. 23 (December 2, 2021): 13040. http://dx.doi.org/10.3390/ijms222313040.

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X-ray photodynamic therapy (XPDT) has been recently considered as an efficient alternative to conventional radiotherapy of malignant tissues. Nanocomposites for XPDT typically consist of two components—a nanophosphor which re-emits X-rays into visible light that in turn is absorbed by the second component, a photosensitizer, for further generation of reactive oxygen species. In this study, BaGdF5 nanophosphors doped with different Eu:Gd ratios in the range from 0.01 to 0.50 were synthesized by the microwave route. According to transmission electron microscopy (TEM), the average size of nanophosphors was ~12 nm. Furthermore, different coatings with amorphous SiO2 and citrates were systematically studied. Micro-CT imaging demonstrated superior X-ray attenuation and sufficient contrast in the liver and the spleen after intravenous injection of citric acid-coated nanoparticles. In case of the SiO2 surface, post-treatment core–shell morphology was verified via TEM and the possibility of tunable shell size was reported. Nitrogen adsorption/desorption analysis revealed mesoporous SiO2 formation characterized by the slit-shaped type of pores that should be accessible for methylene blue photosensitizer molecules. It was shown that SiO2 coating subsequently facilitates methylene blue conjugation and results in the formation of the BaGdF5: 10% Eu3+@SiO2@MB nanocomposite as a promising candidate for application in XPDT.

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13

Li, Bin, Tom Hinklin, Richard Laine, and Stephen Rand. "Ultraviolet nanophosphors." Journal of Luminescence 122-123 (January 2007): 345–47. http://dx.doi.org/10.1016/j.jlumin.2006.01.174.

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14

Yagov, V. V. "Cathode Nanophosphors." Journal of Analytical Chemistry 78, no. 7 (July 2023): 945–52. http://dx.doi.org/10.1134/s1061934823070134.

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Yagov, V. V. "Cathode Nanophosphors." Журнал аналитической химии 78, no. 7 (July 1, 2023): 662–70. http://dx.doi.org/10.31857/s0044450223070149.

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High-current cathodic pulses on an aluminum electrode in solutions containing sufficiently high concentrations of Mg, Ca, Sr, Al, Sc, Y, or La nitrates in a mixture with H3BO3, HF, H3PO4, or H4P2O7 are accompanied by an intense intrinsic luminescence of a number of heavy metals, the ions of which are captured by salt nanofilms and luminescence under the action of hot electrons when are in an environment characteristic of crystal phosphors. The effect of the cathode nanophosphor (CNP) was found in more than 100 systems; photographs are presented for most of the systems. Ga, In, Tl, Ge, Sn, Pb, Mn, Cu, Ag, Cd, Ce, Tb, and Zr ions were activators. The effect of matrix composition on the spectral and kinetic characteristics of the CNP was shown on several examples; a qualitative description of the phenomenon is given, and the prospects for its application to chemical analysis are considered.

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Kamaraju, Jahnavi Rama Madhuri, Raghavendra Rao Kanchi, Rajesh Kumar Borra, Padma Suvarna Reniguntla, and Satyanarayana Rentala. "Synthesis, characterization and anti-cancer applications of ytterbium doped gadolinium molybdate nanophosphor compound." Materials Express 9, no. 8 (November 1, 2019): 882–94. http://dx.doi.org/10.1166/mex.2019.1572.

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Nanophosphor compounds with both diagnostic and therapeutic functions are potential for cancer diagnosis and treatment. Lanthanide complexes play a crucial role in cancer diagnosis and therapy. Gadolinium-complexes are commonly used as magnetic resonance imaging (MRI) contrast agents for cancer imaging. The role of a lanthanide, Ytterbium (Yb) in cancer treatment is not unknown. The present work focuses on finding the role of Yb when doped into Gadolinium complexes in cancer treatment. Our results demonstrate that Yb doped Gadolinium molybdate coated with biocompatible silica, effectively inhibited the viability of breast cancer cells after 24 and 48 h of treatment in in vitro, and in contrast the nanophosphor compounds did not affect the viability of healthy cells. Yb doped Gadolinium molybdate also up-regulated apoptotic genes in breast cancer cells. Hence we propose that Yb doped Gadolinium molybdate is a promising theranostic compound. To the best of our knowledge, this is the first report showing anti-cancer nature of Ytterbium-doped into Gadolinium nanophosphors.

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Zhou, Lei, and Bing Yan. "In-Situ Sol–Gel Synthesis of Nanophosphors M2Y8(SiO4)6O2:Eu3+(M = Ca, Sr) Derived from Novel Crosslinking Reagents as Silicon Sources." Journal of Nanoscience and Nanotechnology 8, no. 3 (March 1, 2008): 1261–65. http://dx.doi.org/10.1166/jnn.2008.18180.

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M2Y8(SiO4)6O2:Eu3+(M = Ca, Sr) nanophosphors were synthesized using sol–gel technology by adopting eight different kinds of silicon sources of novel crosslinging reagents. X-ray diffraction and scanning electronic microscopy show that these materials have sizes of 20–80 nm with different configurations due to the diversity of the silicate sources. Some nanophosphors present the regular microstructure despite high temperature thermolysis. In addition, all these nanophosphors exhibit strong emission at 618 nm.

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Nuñez, Nuria O., Fernando Cussó, Eugenio Cantelar, Beatriz Martin-Gracia, Jesús M. de la Fuente, Ariadna Corral, Marcin Balcerzyk, and Manuel Ocaña. "Bimodal Nd-Doped LuVO4 Nanoprobes Functionalized with Polyacrilic Acid for X-Ray Computed Tomography and NIR Luminescent Imaging." Nanomaterials 10, no. 1 (January 14, 2020): 149. http://dx.doi.org/10.3390/nano10010149.

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Uniform Nd3+-doped LuVO4 nanophosphors have been synthesized for the first time in literature by using a poliol-based method at 120 °C from Nd3+ and vanadate precursors. After optimizing the Nd doping level, these phosphors present intense luminescence in the near-infrared biological windows. The X-ray attenuation capacity of the optimum nanophosphor has been found to be higher than that of a commercial X-ray computed tomography contrast agent. After surface coating with polyacrylic acid, such nanoparticles present high colloidal stability in physiological pH medium and high cell viability. Because of these properties, the developed Nd3+-doped LuVO4 nanoparticles have potential applications as a bimodal probe for NIR luminescent bioimaging and X-ray computed tomography.

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Singh, Sarabjot, G. Lakshminarayana, Manoj Sharma, Thang Duy Dao, K. Chen, Yoshiki Wada, T. Takeda, and T. Nagao. "Excitation Induced Tunable Emission in Ce3+/Eu3+Codoped BiPO4Nanophosphors." Journal of Spectroscopy 2015 (2015): 1–10. http://dx.doi.org/10.1155/2015/493607.

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Ce3+, Eu3+ions singly doped, and Ce3+/Eu3+codoped bismuth phosphate (BiPO4) nanophosphors were synthesized by a simple precipitation method and their structural, morphological, and photoluminescence properties were investigated. The structural and morphological analysis confirms the pure hexagonal crystal structure of the synthesized nanophosphors. From the Fourier transform infrared (FTIR) spectra various absorption bands respective to functional groups such as PO4 and phonon vibrations including the bending modes of the PO4units are identified. The Ce3+doped nanophosphors show spectrally broad luminescence in the blue (centred at 459 nm) wavelength region under the direct optical excitation of Ce3+at 417 nm. For Eu3+doped nanophosphors, five emission bands have been observed with 394 nm excitation wavelength. Among them, 595 nm has shown bright yellowish-orange emission. These results demonstrate that by appropriately tuning the excitation wavelength of these codoped nanophosphors the emission color in the visible region (blue and orange) can be flexibly controlled in a single sample without varying its chemical composition and size. The mechanism for this excitation energy dependent tunable emission is explained on the basis of nonenergy transfer (ET) occurring among Ce3+/Eu3+dopant ions.

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Manjula, S. N., M. Chandrasekhar, M. R. Anil Kumar, Mir Waqas Alam, C. R. Ravikumar, H. C. Ananda Murthy, N. Basavaraju, and H. Nagabhushana. "Synthesis of MgAl2O4: Sm3+ Nanophosphor and Its Photoluminescence, Electrochemical Sensing, and Photocatalytic Studies." Advances in Materials Science and Engineering 2023 (October 25, 2023): 1–15. http://dx.doi.org/10.1155/2023/8818883.

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A series of MgAl2O4: Sm3+ nanophosphors were synthesized using oxalyl dihydrazide (ODH) as fuel at low temperature. The X-ray diffraction studies revealed a crystallite size of 20 nm for the nanophosphors. The energy band gap values were found to be in the range from 4.86 to 5.42 eV. Because of distinct f–f transitions from 4F7/2 ⟶ 6P3/2 of Sm3+ ions in the host stimulated at 406 nm, the PL characteristic emission peaks of Sm3+ ions were observed between 406 and 605 nm. The optimized MgAl2O4: Sm3+ phosphors exhibited 97% colour purity and lie in the orange red to yellow area of the CIE diagram. With MgAl2O4: Sm3+ nanophosphors, novel photocatalysts for the elimination of the dye Fast orange red (FOR) have been proved to function at an excited wavelength of 493 nm in UV light. The experiment showed 97.46% dye decolorization, respectively, after 120 min irradiation. Using the carbon paste electrode in the cyclic voltammetry (CV) technique, lead was detected in 0.1N HCl solution (MCPE). The MgAl2O4: Sm3+ nanophosphors are useful sensing material for an element like lead. Finally, we conclude that the synthesized MgAl2O4: Sm3+ nanophosphors are potential candidates for multifunctional applications.

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Nguyen, Vu, Thoi Nguyen Thi, Roan Pham Duc, Hung Nguyen Manh, Giang Lam Thi Kieu, and Tien Dinh Manh. "Synthesis and properties of YVO4:Ho and YVO4:Ho,Bi luminescent nanomaterials by combustion method." Vietnam Journal of Catalysis and Adsorption 10, no. 1S (October 15, 2021): 401–4. http://dx.doi.org/10.51316/jca.2021.127.

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YVO4:Ho and YVO4:Ho,Bi nanophosphors were synthesized via combustion synthesis using urea as fuel and metal nitrates as precursor. Structures, morphologies and optical properties of YVO4:Ho and YVO4:Ho,Bi nanophosphors annealed at 900 °C were studied by X-ray diffraction (XRD), scanning electron microscopy (SEM), photoluminescent (PL) and photoluminescent excitation (PLE) spectra. The clearly YVO4 tetragonal phase was obtained. The average diameters for the phosphor particles are 20-30 nm. The nanophosphors could be excited by 320 nm which correspond to the VO4 absorption and then PL spectra of YVO4:Ho and YVO4:Ho,Bi nanophosphors are described by the 5F8, 5S2 – 5I8, 5F5 – 5I8 và 5F4, 5S2 → 5I7 transitions of Ho3+ ions at 543, 655 and 755 nm. The effects of Ho3+ and Bi3+ concentrations on structure and optical properties have been investigated

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Kurrey, Manmohan Singh, and Bhoopendra Dhar Diwan. "Synthesis and Characterization of Novel ZnO Nanophosphors." Advanced Materials Research 938 (June 2014): 145–48. http://dx.doi.org/10.4028/www.scientific.net/amr.938.145.

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In this paper, the novel ZnO nanophosphors is synthesized by solgel method. The study exposed ZnO nanophosphors samples in Gamma (y) radiation to investigate their thermo-luminescence (TL) intensity as a function of temperature. The thermo-luminescence response has been studied in the dose range 0.291.16 kGy and it is observed that the thermo-luminescence response increases with increase in the dose. Moreover, the TL intensity increases with temperature and attains its maximum value near 200 Cand decreases after this temperature. Keywords: Dosimetry; Thermo-luminescence; Zinc oxide; Nanophosphors.

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Kumar, Sanjeev, Garima Jain, Kuldeep Kumar, Ashish Gupta, J. S. Tawale, B. P. Singh, S. R. Dhakate, and P. D. Sahare. "Stress-Induced Structural Phase Transition in Polystyrene/NaYF4: Eu3+ Photoluminescent Electrospun Nanofibers." Journal of Nanomaterials 2022 (April 13, 2022): 1–10. http://dx.doi.org/10.1155/2022/2173629.

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Polystyrene (PS) composite nanofibers were successfully fabricated by embedding NaYF4: Eu3+ nanophosphor into the PS matrix via electrospinning. The photoluminescence spectra, surface morphology and crystal structure of nanofibers were characterized by photoluminescence spectroscopy, scanning electron microscopy, and X-ray diffractometer, respectively. Stress-induced α-NaYF4: Eu3+ (cubic) to β-NaYF4: Eu3+(hexagonal) structural phase transformation was observed in the nanofibers. The stress-induced phase transformation provides enough space for tailoring the properties of novel nanostructures. The composite nanofibers exhibited blue emission with 239 nm excitation wavelength. The XRD pattern of espun nanofibers confirmed the successful incorporation of 5% NaYF4: Eu3+ nanophosphors into the PS matrix. Brilliant values of the chromaticity coordinates of the prepared photoluminescent nanofibers (PLNs) predict their possible use in blue solid-state lighting applications.

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Cesaria, Maura, and Baldassare Di Bartolo. "Nanophosphors-Based White Light Sources." Nanomaterials 9, no. 7 (July 22, 2019): 1048. http://dx.doi.org/10.3390/nano9071048.

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Miniaturization requests and progress in nanofabrication are prompting worldwide interest in nanophosphors as white-emission mercury-free lighting sources. By comparison with their bulk counterparts, nanophosphors exhibit reduced concentration quenching effects and a great potential to enhance luminescence efficiency and tunability. In this paper, the physics of the nanophoshors is overviewed with a focus on the impact of spatial confinement and surface-to-volume ratio on the luminescence issue, as well as rare earth-activated multicolor emission for white light (WL) output. In this respect, the prominently practiced strategies to achieve WL emission are single nanophosphors directly yielding WL by means of co-doping and superposition of the individual red, green, and blue emissions from different nanophosphors. Recently, a new class of efficient broadband WL emitting nanophosphors has been proposed, i.e., nominally un-doped rare earth free oxide (yttrium oxide, Y2O3) nanopowders and Cr transition metal-doped garnet nanocrystals. In regard to this unconventional WL emission, the main points are: it is strictly a nanoscale phenomenon, the presence of an emitting center may favor WL emission without being necessary for observing it, and, its inherent origin is still unknown. A comparison between such an unconventional WL emission and the existing literature is presented to point out its novelty and superior lighting performances.

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K, Vini, Padmakumar H., and K. M. Nissamudeen. "Luminescence Study of Red Light Emitting Y2O3:Sm3+ Nanophosphors and Enhancement by Co-doping with Gadolinium oxide." International Journal of Recent Technology and Engineering 9, no. 6 (March 30, 2021): 60–70. http://dx.doi.org/10.35940/ijrte.f5363.039621.

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This work presents the optical and structural properties of samarium oxide doped and gadolinium oxide co-doped yttrium oxide nanophosphors prepared by Combustion method. The photoluminescence emission intensity was maximum for 2wt% Sm3+ doped Y2O3 powders, that results 4G5/2 - 6H7/2 transition within Samarium, emits red light at 608 nm under the excitation of 260 nm. In the case of co-dopant, maximum intensity is obtained for 3wt% Gd3+ under the excitation of 255 nm.The Y:Sm:Gd exhibit luminescence intensity of 4.21 times more than that of Y:Sm nanophosphors. These results indicate that the prepared nanophosphors can be used in optoelectronic devices.

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Kostyukov, A. I., A. A. Nashivochnikov, Vl N. Snytnikov, M. I. Rakhmanova, and V. N. Snytnikov. "Study of t-ZrO₂ : Eu³⁺ nanophosphor obtained by laser vaporisation using a cw CO₂ laser." Quantum Electronics 52, no. 2 (February 1, 2022): 149–54. http://dx.doi.org/10.1070/qel17982.

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Abstract ZrO2 : Eu3+ nanophosphor has been fabricated by vaporisation of a ceramic target of specified composition using a CO2 laser, with subsequent vapour condensation in an argon flow. Nanoparticles with spherical morphology have been synthesised at a pressure of 0.1 atm. The t-ZrO2 phase is found to be dominant (98 %). According to the transmission electron microscopy data, the nanoparticle size is 10 ± 4 nm. The luminescence properties of fabricated nanoparticles have been studied. It is shown that the strong red luminescence of the samples is mainly due to the bands peaking at 591 and 606 nm, which are related, respectively, to the 5D0 → 7F1 and 5D0 → 7F2 transitions of Eu3+ ion in the t-ZrO2 structure. It is shown also that europium is uniformly distributed over the ZrO2 matrix during laser synthesis. A comparative study of the t-ZrO2 : Eu3+ nanophosphor and the initial coarse-grained target has been performed. It is concluded that the proposed method of laser vaporisation is promising for synthesising t-ZrO2-based nanophosphors.

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Koneru, Girija Venkateswara, Sirisha Bandi, and Venkata Nagendra Kumar Putta. "Luminescence Properties of Yb3+/Ho3+ doped GdPO4 Nanocomposites Prepared by Hydrothermal Method using PEG(6000)." Asian Journal of Chemistry 35, no. 7 (2023): 1598–602. http://dx.doi.org/10.14233/ajchem.2023.27466.

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By using hydrothermal synthesis, a novel Yb3+/Ho3+ co-doped GdPO4 nanophosphors were prepared which shows both upconversion (UC) and downconversion (DC) with excellent luminescence properties. DC peaks were observed at ~460, ~550, ~650 and ~750 nm. By excitation at 300 nm, a very faint P-O charge transfer (CT) band of Ho3+ ions, as well as a tiny non-radiative resonance energy transfer was observed. It is discovered that GdPO4: Yb3+/Ho3+, an upconversion (UC) nanophosphor, enables the production and enhancement of luminescence on a vast scale. On strong 980 nm laser illumination, the upconversion emission spectra show a conspicuous expectant peak of the Ho3+ ion at ~550 and ~650 nm. This process yields high-quality nanocrystalline materials with sizes between a few to tens of nm range. Considering the results of the study at 300 nm excitation, GdPO4: Yb3+/Ho3+ produced a high quantum yield value. The findings are useful for creating efficient phosphors and it proves applications of nanophosphor materials covered by this method are numerous.

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Peng, Lixin, Qingyu Meng, and Wenjun Sun. "Size dependent optical temperature sensing properties of Y2O3: Tb3+, Eu3+ nanophosphors." RSC Advances 9, no. 5 (2019): 2581–90. http://dx.doi.org/10.1039/c8ra10066g.

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Using urea as a precipitation agent, Tb³⁺, Eu³⁺ co-doped Y₂O₃ nanophosphors were synthesized by a homogeneous precipitation method. The size dependence-optical temperature sensing properties of nanophosphors have been studied.

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Basavaraj, R. B., H. J. Amith Yadav, H. Nagabhushana, S. C. Prashantha, K. S. Anantharaju, and Y. S. Vidya. "Synthesis, Characterization and Photoluminescence Properties of CdSiO₃:Ce³⁺ Nanophosphors." Materials Science Forum 830-831 (September 2015): 612–15. http://dx.doi.org/10.4028/www.scientific.net/msf.830-831.612.

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CdSiO3: Ce3+ (1-11mol %) nanophosphors were prepared by low temperature solution combustion method using Oxalyl di-hydrazine (ODH) as fuel. The final products were well characterized by PXRD and SEM. The optical properties of the nanophosphors were investigated by Photoluminescence studies. PXRD results evident that CdSiO3 phosphor shows pure single monoclinic structure. The average crystallite size was calculated using Debye – Scherer’s formula and was found to be in the range of 30-40 nm. The SEM micrographs show phosphors with high porosity and irregular shaped particles. Photoluminescence peaks observed at 454, 563 and 679 nm under 397 nm excitation was due to transition from 5d state to the 2F5/2 and 2F7/2 components of the ground state of Ce3+ in CdSiO3 host material. CdSiO3:Ce3+ nanophosphors show an intense yellow emission with CIE coordinates (0.47, 0.50) with average correlated color temperature value 3284 was within the range of vertical day light. The present study successfully demonstrates solution combustion synthesis of nanophosphors for display applications.

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Wang, Weili, Shihai Miao, Dongxun Chen, and Yanjie Liang. "Rapid Aqueous-Phase Synthesis and Photoluminescence Properties of K0.3Bi0.7F2.4:Ln3+ (Ln = Eu, Tb, Pr, Nd, Sm, Dy) Nanocrystalline Particles." Crystals 12, no. 7 (July 10, 2022): 963. http://dx.doi.org/10.3390/cryst12070963.

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Trivalent lanthanides (Ln3+) doped bismuth-based inorganic compounds have attracted considerable interest as promising candidates for next-generation inorganic luminescent materials. Here, a series of K0.3Bi0.7F2.4 (KBF) nanocrystalline particles with controlled morphology have been synthesized through a low-temperature aqueous-phase precipitation method. Using KBF as the host matrix, Eu3+, Tb3+, Pr3+, Nd3+, Sm3+, and Dy3+ ions are introduced to obtain K0.3Bi0.7F2.4:Ln3+ (KBF:Ln) nanophosphors. The as-prepared KBF:Ln nanophosphors exhibit commendable photoluminescence properties, in which multicolor emissions in a single host lattice can be obtained by doping different Ln3+ ions when excited by ultraviolet light. Moreover, the morphology and photoluminescence performance of these nanophosphors remain unchanged under different soaking times in water, showing good stability in a humid environment. The proposed simple and rapid synthesis route, low-cost and nontoxic bismuth-based host matrix, and tunable luminescent colors will lead the way to access these KBF:Ln nanophosphors for appealing applications such as white LEDs and optical thermometry.

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Kim, Su Yeon, Jong Seok Jeong, K. Andre Mkhoyan, and Ho Seong Jang. "Direct observation of the core/double-shell architecture of intense dual-mode luminescent tetragonal bipyramidal nanophosphors." Nanoscale 8, no. 19 (2016): 10049–58. http://dx.doi.org/10.1039/c5nr05722a.

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Intense green-emitting LiYF₄:Ce,Tb tetragonal bipyramidal nanophosphors are synthesized and the composition is applied to bright dual-mode-emitting core/double-shell nanophosphors with a tetragonal bipyramidal morphology. The core/double-shell structure is directly confirmed by energy dispersive X-ray spectroscopy.

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Zhang, Xiaoting, Tomokatsu Hayakawa, Masayuki Nogami, and Yukari Ishikawa. "Selective Synthesis and Luminescence Properties of Nanocrystalline GdF3:Eu3+with Hexagonal and Orthorhombic Structures." Journal of Nanomaterials 2010 (2010): 1–7. http://dx.doi.org/10.1155/2010/651326.

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GdF3:Eu3+nanophosphors with hexagonal or orthorhombic structure have been succeeded to be selectively synthesized at room temperature for the first time via a simple soft chemical route. The structure and morphology of GdF3:Eu3+nanophosphors were controlled by using different fluoride precursors. Hexagonal GdF3:Eu3+nanocrystals were formed when NaBF4was used as a fluoride precursor, while orthorhombic GdF3:Eu3+nanocrystals were obtained with NaF or NH4F fluoride precursor. It was also experimentally revealed that hexagonal GdF3:Eu3+nanophosphors emitted essentially stronger Eu3+luminescence than orthorhombic ones did. The formation mechanism of GdF3nanocrystals and the possible reasons of the strong PL in hexagonal were discussed.

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Savage, Nicholas, Brent Wagner, Yuelan Zhang, Brendan Lynch, Hisham Menkara, Christopher Summers, and Zhitao Kang. "Nanophosphor-Embedded Oxide Glass-Matrix Nanocomposite for X-ray Imaging." MRS Proceedings 1454 (2012): 261–66. http://dx.doi.org/10.1557/opl.2012.961.

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ABSTRACTTb doped gadolinium fluoride nanophosphors embedded in an aluminosilicate glass matrix is reported for X-ray imaging applications. The nanocomposite scintillators were prepared by a melt-quench method followed by annealing. The GdF3:Tb nanophosphors precipitated within the oxide glass matrix during the processing and their luminescence and scintillation properties were investigated.

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Kostyukov, A., A. Nashivochnikov, M. Rakhmanova, and V. Snytnikov. "Luminescence performance of laser synthesized Al₂O₃:Eu³⁺ nanophosphors depending on synthesis conditions." Journal of Physics: Conference Series 2067, no. 1 (November 1, 2021): 012008. http://dx.doi.org/10.1088/1742-6596/2067/1/012008.

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Abstract Al2O3:Eu3+ nanophosphors were prepared by laser vaporization method in a flowing mixture of Ar/He and O2. Luminescence properties of Al2O3:Eu3+ nanophosphors are predominantly determined by Eu3+ ions red emission with inhomogeneously broadened bands in the region of 550-750 nm corresponding to 5D0 →7FJ transitions of Eu3+ (J = 0 - 4). Hypersensitive electric dipole transition 5D0 →7F2 dominates in the spectrum and is responsible for the red emission. The effect of crystallite size on luminescence properties of Al2O3:Eu3+ nanocrystals was observed. It was shown that the introduction of oxygen during the synthesis improves the luminescence performance. The obtained chromaticity coordinates and high absolute QY (~ 14%) indicate the possibility of using red nanophosphors based on Al2O3:Eu3+.

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Psuja, P., D. Hreniak, and W. Strek. "Rare-Earth Doped Nanocrystalline Phosphors for Field Emission Displays." Journal of Nanomaterials 2007 (2007): 1–7. http://dx.doi.org/10.1155/2007/81350.

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The cathodoluminescence properties of rare-earth (RE = Ce, Eu, Tb) doped nanocrystalline phosphors (Y2O3,Y3Al5O12) were investigated. Their structure and morphology were determined and correlated with optical properties. The effect of grain sizes on emission yield of RE doped nanophosphors has been investigated. A possibility of application of RE doped nanophosphors for efficient field emission display (FED) devices has been discussed.

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MANJULA, S. N., M. CHANDRASEKHAR, M. R. ANIL KUMAR, N. RAGHAVENDRA, C. R. RAVIKUMAR, H. C. ANANDA MURTHY, and H. NAGABHUSHANA. "MgAl2O4:Ho3+ Nanophosphors: Electrochemical Sensor, Photoluminescence and Photocatalytic Applications." Asian Journal of Chemistry 35, no. 11 (October 31, 2023): 2659–67. http://dx.doi.org/10.14233/ajchem.2023.28287.

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Ho3+-doped MgAl2O4 nanophosphors (1-11 mol%) was synthesised via solution combustion method using oxalyl dihydrazide (ODH) as fuel. The findings revealed a range of band gap energies (Eg) between 4.86 and 5.42 eV. It was confirmed that these values correspond extremely well with the experimental data using the DFT approach. The Ho3+ ions in the host undergo f-f transitions that are triggered at 406 nm and as a result, exhibit discrete photoluminescence emission peaks between 406 and 605 nm. Enhanced MgAl2O4 have CIE coordinates from orange-red to yellow region and 97% colour purity. Photocatalytic properties of nanophosphors under UV light led to the discovery that a rapid orange-red dye is activated at 493 nm. Removal of fast orange red (F-OR) dye using the new photocatalysts and MgAl2O4:Ho3+ nanophosphors has been demonstrated. The investigation showed that 89.02% of the dye lost its colour after being exposed to radiation for 120 min. The modified MgAl2O4:Ho3+ carbon paste electrode used in the cyclic voltametric (CV) technique for lead pollution detection. Based on their electrochemical performance, it is concluded that MgAl2O4:Ho3+ nanophosphors are a viable material for lead detecting electrodes.

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El Ghoul, Jaber, and Naglaa Abdel All. "Sol–Gel Synthesis and Yellow Luminescent Properties of Zn2SiO4 :V Nanophosphor Materials." Journal of Nanoelectronics and Optoelectronics 14, no. 12 (December 1, 2019): 1796–803. http://dx.doi.org/10.1166/jno.2019.2708.

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Pure Zn2SiO4 and Vanadium doped Zn2SiO4 green nanophosphor materials were synthesized using sol–gel method and thermally annealed at 1500 °C. The structural, morphology and optical properties were characterized using various techniques; X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Scanning electron microscope (SEM), high resolution transmission electron microscopy (HTEM), and photoluminescence spectroscopy (PL). XRD results shown β-Zn2SiO4 phase with triclinic structure that obtained after the heat treatment of samples at 1500 °C. The PL spectrum of V-Zn2SiO4 shows an intensive emission band in the visible region centered at 526 nm. This band is related to presence of vanadium in the interfaces between Zn2SiO4 nanoparticles and the host matrix, SiO2. The interesting of these nanophosphors were attributed for its capability of showing color-tunable emissions in visible region under a single-wavelength excitation.

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Putta, Venkata Nagendra Kumar, Meghana Adicherla, Sirisha Bandi, Girija Venkateswara Koneru, and Phaniraja Kanuparti. "Solid State Synthesis and Characterization of Yb3+/Ho3+ Doped GdPO4 Nanophosphor for Luminescence Properties." Asian Journal of Chemistry 35, no. 10 (September 28, 2023): 2349–52. http://dx.doi.org/10.14233/ajchem.2023.27784.

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A reliable solid-state method for synthesizing GdPO4:Yb3+/Ho3+ nanophosphor is presented, exhibiting both up and down conversion luminescent properties. The peaks were observed at 460, 550, 640, and 750 nm after excitation at 300 nm, which is followed by nonradiative resonance energy transfer (ET) with the P-O charge transfer band of Ho3+ ions. A significant up-conversion nanophosphors by enhancing Ho3+ ion emissions is accomplished. The Ho3+ ion peaks at 542 and 635 nm were identified using a strong 980 nm laser source, leading to well-crystalline nanoparticles. The present results demonstrated an enormous potential of GdPO4:Yb3+/Ho3+ for high-quality, widespread luminescence. Due to their significant quantum yield when excited at a wavelength of 300 nm, these materials exhibit a diverse array of potential applications and hold considerable potential for advancement across several industries.

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Zhang, Kai, A. K. Pradhan, G. B. Loutts, U. N. Roy, Y. Cui, and A. Burger. "Lu2O3:Eu3+ nanoparticles and processed ceramics: Structural and spectroscopic studies." Journal of Materials Research 19, no. 9 (September 2004): 2714–18. http://dx.doi.org/10.1557/jmr.2004.0348.

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Europium-doped lutetium oxide (Lu2O3:Eu3+) nanophosphors were synthesized via modified combustion technique using urea as the fuel and metal nitrates as oxidants. The pellets prepared from the calcined nanocrystalline powders were vacuum sintered up to 1750 °C leading to very translucent ceramic. The products were characterized by x-ray diffraction to ascertain phase purity. The microstructures reveal the nanocrystalline nature of the powders. We have illustrated the crystallite size dependence and the influence of Eu3+ activation of Lu2O3:Eu3+ nanophosphors on Raman scattering. We have also demonstrated the particle size dependence of emission characteristics of nanophosphors and ceramics. Our results suggest that although the processed ceramics display superior emission characteristics, the nanocrystalline phosphor powders calcined at 1100 °C also display reasonably good emission characteristics, illustrating the possibility of their applications in display technology.

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Sadowska, Karolina, Tomasz Ragiń, Marcin Kochanowicz, Piotr Miluski, Jan Dorosz, Magdalena Leśniak, Dominik Dorosz, et al. "Analysis of Excitation Energy Transfer in LaPO4 Nanophosphors Co-Doped with Eu3+/Nd3+ and Eu3+/Nd3+/Yb3+ Ions." Materials 16, no. 4 (February 14, 2023): 1588. http://dx.doi.org/10.3390/ma16041588.

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Nanophosphors are widely used, especially in biological applications in the first and second biological windows. Currently, nanophosphors doped with lanthanide ions (Ln3+) are attracting much attention. However, doping the matrix with lanthanide ions is associated with a narrow luminescence bandwidth. This paper describes the structural and luminescence properties of co-doped LaPO4 nanophosphors, fabricated by the co-precipitation method. X-ray structural analysis, scanning electron microscope measurements with EDS analysis, and luminescence measurements (excitation 395 nm) of LaPO4:Eu3+/Nd3+ and LaPO4:Eu3+/Nd3+/Yb3+ nanophosphors were made and energy transfer between rare-earth ions was investigated. Tests performed confirmed the crystal structure of the produced phosphors and deposition of rare-earth ions in the structure of LaPO4 nanocrystals. In the range of the first biological window (650–950 nm), strong luminescence bands at the wavelengths of 687 nm and 698 nm (5D0 → 7F4:Eu3+) and 867 nm, 873 nm, 889 nm, 896 nm, and 907 nm (4F3/2 → 4I9/2:Nd3+) were observed. At 980 nm, 991 nm, 1033 nm (2F5/2 → 2F7/2:Yb3+) and 1048 nm, 1060 nm, 1073 nm, and 1080 nm (4F3/2 → 4I9/2:Nd3+), strong bands of luminescence were visible in the 950 nm–1100 nm range, demonstrating that energy transfer took place.

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Kirsanova, Daria, Vladimir Polyakov, Vera Butova, Peter Zolotukhin, Anna Belanova, Zaira Gadzhimagomedova, Mikhail Soldatov, Ilia Pankin, and Alexander Soldatov. "The Rare-Earth Elements Doping of BaGdF5 Nanophosphors for X-ray Photodynamic Therapy." Nanomaterials 11, no. 12 (November 26, 2021): 3212. http://dx.doi.org/10.3390/nano11123212.

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It is known that the initiation of photodynamic therapy (PDT) in deep-seated tumors requires the use of X-rays to activate the reactive oxygen species generation in deep tissues. The aim of this paper is to synthesize X-ray nanophosphors and analyze their structural and luminescence characteristics to push the PDT process deep into the body. The article deals with BaGdF5:Eu3+, BaGdF5:Sm3+, and BaGdF5:Tb3+ nanophosphors synthesized using microwave synthesis. It is found that the nanoparticles are biocompatible and have sizes 5–17 nm. However, according to the analysis of X-ray excited optical luminescence, BaGdF5:Sm3+ nanophosphors will not be effective for treating deep-seated tumors. Thus, BaGdF5:Eu3+ and BaGdF5:Tb3+ nanoparticles meet the requirements for the subsequent production of nanocomposites based on them that can be used in X-ray photodynamic therapy.

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K, Vini, Padmakumar H., and K. M. Nissamudeen. "The Role of Bismuth on the Best Red Light Emitting Nanophosphors." International Journal of Recent Technology and Engineering 9, no. 6 (March 30, 2021): 55–59. http://dx.doi.org/10.35940/ijrte.f5362.039621.

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This paper explains the role of bismuth in the luminescence enhancement of Y2O3 :Eu nanophosphors prepared by Combustion method. Bi ions serve as effective sensitizers for visible emitting rare earths for Light Emitting Diodes. From the X-ray diffraction studies, bismuth co-activated nanophosphors exhibit an early crystallization. Bismuth incorporation not only results in the luminescence enhancement at 612 nm, due to 5D0 to 7F2 transition but also reduces the processing temperature for intense photoemission.

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Dorokhina, A. M., V. V. Bakhmetyev, H. Kominami, A. Toru, and M. Hisashi. "Study of the properties of Ce³⁺-doped fluoride nanophosphors: phase composition, morphology, luminescence." Journal of Physics: Conference Series 2056, no. 1 (October 1, 2021): 012048. http://dx.doi.org/10.1088/1742-6596/2056/1/012048.

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Abstract To date, nanophosphors have found application in various fields, one of which is medicine. These phosphors were developed with the aim to become one of the components of a drug for photodynamic therapy of oncological diseases. The aim of this work was to study the effect of the duration, environment, and stabilizers of solvothermal synthesis on the microstructure and luminescent properties of the YF3:Ce nanophosphor. The solvothermal synthesis technique was carried out in three different media: water, ethanol, and ethylene glycol. The optimal duration of the synthesis was also determined (the synthesis was carried out at a temperature of 200°C for 4…20 hours). The dependence of the YF3 luminescence on the phase composition and the solvothermal synthesis medium was studied. Using SEM, the morphology and particle size of YF3:Ce phosphors were studied depending on different stabilizers (polyethylene glycol, polyethyleneimine, polyvinylpyrrolidone). The luminescence intensity of YF3:Ce and Na(Y1,5Na0,5)F6:Ce samples was compared.

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Lim, Shuang Fang, Robert Riehn, Chih-kuan Tung, William S. Ryu, Rui Zhuo, Joanna Dalland, and Robert H. Austin. "Upconverting nanophosphors for bioimaging." Nanotechnology 20, no. 40 (September 8, 2009): 405701. http://dx.doi.org/10.1088/0957-4484/20/40/405701.

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Jacobsohn, L. G., B. L. Bennett, R. E. Muenchausen, J. F. Smith, and D. Wayne Cooke. "Luminescent properties of nanophosphors." Radiation Measurements 42, no. 4-5 (April 2007): 675–78. http://dx.doi.org/10.1016/j.radmeas.2007.01.066.

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Nanda, Karuna Kar. "Direct White Light Nanophosphors." Key Engineering Materials 444 (July 2010): 219–28. http://dx.doi.org/10.4028/www.scientific.net/kem.444.219.

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White light emission based on semiconductor nanostructures represents a new technology platform for solid state lighting. The major advantages are the easy synthesis and tuning of color emission in the visible range and the high optical stability of nanostructures. This chapter summarizes the materials that can be used as white light nanophosphors.

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You, Yongqiang, Kaiwei Huang, Xiaojia Liu, Xi Pan, Jiahuan Zhi, Qianjun He, Huifang Shi, Zhongfu An, Xing Ma, and Wei Huang. "Hydrophilic Ultralong Organic Nanophosphors." Small 16, no. 8 (January 31, 2020): 1906733. http://dx.doi.org/10.1002/smll.201906733.

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Dosev, Dosi, Mikaela Nichkova, and Ian M. Kennedy. "Inorganic Lanthanide Nanophosphors in Biotechnology." Journal of Nanoscience and Nanotechnology 8, no. 3 (March 1, 2008): 1052–67. http://dx.doi.org/10.1166/jnn.2008.18155.

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Recently different types of fluorescent nanoparticles and other nanostructures have been promoted as alternatives for the fluorescent organic dyes that are traditionally used in biotechnology. Quantum dots, dye-doped polymer and silica particles have found many applications in biochemical protocols and are extensively discussed in the literature. Nanostructures based on inorganic phosphors (nanophosphors) are a new emerging class of materials with unique properties that make them very attractive for bio-application. Some results for the successful application of nanophosphors in biochemical applications have been reported. In this review we summarize the types of materials, their properties that are relevant to bio-applications, and the current status of their implementation in biotechnology.

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Jayanthi, K., and Sunkara V. Manorama. "Lumino-magnetic YAG:Ce nanophosphors: novel synthesis routes for efficient luminescence and magnetic properties." J. Mater. Chem. C 2, no. 48 (2014): 10322–30. http://dx.doi.org/10.1039/c4tc01960a.

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Danthanarayana, Adheesha N., Erin Finley, Binh Vu, Katerina Kourentzi, Richard C. Willson, and Jakoah Brgoch. "A multicolor multiplex lateral flow assay for high-sensitivity analyte detection using persistent luminescent nanophosphors." Analytical Methods 12, no. 3 (2020): 272–80. http://dx.doi.org/10.1039/c9ay02247c.

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Journal articles on the topic 'Nanophosphors'

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