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Journal articles on the topic 'Luminophors'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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1

Tomin, V. I., K. Hubisz, and Z. Mudryka. "Anomalous Inhomogeneous Broadening of Electronic Spectra of Molecules with Internal Charge Transfer." Zeitschrift für Naturforschung A 58, no. 9-10 (October 1, 2003): 529–36. http://dx.doi.org/10.1515/zna-2003-9-1009.

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Excited states with internal charge transfer of some molecules show an anomalously strong inhomogeneous broadening of their electronic spectra. Here such an inhomogeneous broadening for N, N-dimethylaminobenzonithrile (DMABN) was studied. The spectral inhomogeneity for DMABN in some polar solvents reaches 140 - 150 nm.The interpretation of the obtained results is based on treating a solution as a set of chemically identical solvates with a luminophor molecule in the centre, having different energies of the pure electronic transitions. The inhomogeneity arises due to an intermolecular effect of the luminophors environment on its spectra in polar solvents, as well as a process of intramolecular movement of the twisting fragments relative to the main moiety of DMABN.

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2

Dybova, T. N., N. V. Komarov, Yu N. Koryukin, N. G. Moskovchenko, and V. V. Popov. "Organosilicon luminophors for luminescent solar concentrators." Journal of Applied Spectroscopy 55, no. 5 (November 1991): 1177–80. http://dx.doi.org/10.1007/bf00658422.

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3

Benderskaya, L. P., E. G. Morozov, S. A. Borisov, and A. I. Novikov. "Broad- and narrow-band lamp luminophors." Journal of Applied Spectroscopy 62, no. 3 (May 1995): 568–72. http://dx.doi.org/10.1007/bf02606705.

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4

Kolerov, A. N. "Making reference aerosols from laser luminophors." Measurement Techniques 43, no. 3 (March 2000): 285–87. http://dx.doi.org/10.1007/bf02503528.

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5

Chen, Pengfei, Yuanye Yin, Yingyong Ni, Huichao Zhu, Jianyan Huang, Jiaxiang Yang, Jianjun Yang, and Lin Kong. "Molecular engineering of carbazole–acrylonitrile fluorophores: substituent-dependent optical properties and mechanochromism." CrystEngComm 23, no. 11 (2021): 2289–96. http://dx.doi.org/10.1039/d1ce00012h.

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Controlling the fluorescence properties of organic molecules in the aggregation state and understanding the structure–activity relationship are important for developing excellent luminophors with tunable solid emission.

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6

Swamy, K. M. K., Min Sun Park, Su Jung Han, Sook Kyung Kim, Ju Hee Kim, Chongmok Lee, Hyunjin Bang, Youngmee Kim, Sung-Jin Kim, and Juyoung Yoon. "New pyrrolopyridazine derivatives as blue organic luminophors." Tetrahedron 61, no. 43 (October 2005): 10227–34. http://dx.doi.org/10.1016/j.tet.2005.08.038.

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7

Daniklin, M., M. Must, É. Pedak, É. Pyarnova, G. Ryasnyi, V. Seman, I. Shpin'kov, and L. Shpin'kova. "Formation of europium centers in CaS:Eu, Cl luminophors." Journal of Applied Spectroscopy 62, no. 3 (May 1995): 559–63. http://dx.doi.org/10.1007/bf02606703.

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8

Sontakke, Atul D., Jean-Marie Mouesca, Victor Castaing, Alban Ferrier, Mathieu Salaün, Isabelle Gautier-Luneau, Vincent Maurel, Alain Ibanez, and Bruno Viana. "Time-gated triplet-state optical spectroscopy to decipher organic luminophores embedded in rigid matrices." Physical Chemistry Chemical Physics 20, no. 36 (2018): 23294–300. http://dx.doi.org/10.1039/c8cp03952f.

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9

Inglev, Rune, Emil Møller, Jonas Højgaard, Ole Bang, and Jakob Janting. "Optimization of All-Polymer Optical Fiber Oxygen Sensors with Antenna Dyes and Improved Solvent Selection Using Hansen Solubility Parameters." Sensors 21, no. 1 (December 22, 2020): 5. http://dx.doi.org/10.3390/s21010005.

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We present an all-polymer optical fiber sensor for the sensing of dissolved oxygen by phase-fluorometry. The sensing matrix is applied as a film on the fiber end-surface, and consists of poly-methylmethacrylate (PMMA), the oxygen quenchable luminophore platinum-octaethylporphyrin (PtOEP) and the luminophore coumarin 545T for increasing the brightness of PtOEP by way of resonance energy transfer (RET), also called light harvesting. We show that by using Hansen Solubility Parameters (HSPs), it is possible to quantitatively formulate a solvent mixture with a good solubility of the polymer matrix and the luminophores simultaneously. Our approach can readily be extended to other polymers and luminophores and is therefore a valuable tool for researchers working with photoluminescence and polymeric matrices.

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10

Barabanov, I. I. "New bifunctional luminophors. Synthesis of (p-N,N-dimethylaminophenyl)cyanoperylenes." Russian Journal of Organic Chemistry 44, no. 11 (November 2008): 1626–30. http://dx.doi.org/10.1134/s1070428008110109.

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11

Klimonskii, S. O., A. É. Primenko, V. D. Kuznetsov, M. I. Danilkin, and V. Seman. "Magnetic properties and energy transfer in the luminophors CaS:Eu,Cl." Journal of Experimental and Theoretical Physics 86, no. 5 (May 1998): 924–29. http://dx.doi.org/10.1134/1.558563.

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12

Yu, X. E., H. Hartl, H. J. Schulz, and M. Thiede. "Properties of barium chlorophosphate (apatite) luminophors activated by divalent europium." Zeitschrift f�r anorganische und allgemeine Chemie 567, no. 1 (1988): 60–68. http://dx.doi.org/10.1002/zaac.19885670107.

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13

Kalinovskaya, I. V., A. N. Zadorozhnaya, and V. E. Karasev. "The dispersity and distribution of luminophors in high-pressure polyethylene." Russian Journal of Physical Chemistry A 82, no. 12 (November 27, 2008): 2156–58. http://dx.doi.org/10.1134/s0036024408120327.

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14

Imai, Yoshitane. "Generation of Circularly Polarized Luminescence by Symmetry Breaking." Symmetry 12, no. 11 (October 28, 2020): 1786. http://dx.doi.org/10.3390/sym12111786.

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Circularly polarized luminescence (CPL) has attracted significant attention in the fields of chiral photonic science and optoelectronic materials science. In a CPL-emitting system, a chiral luminophore derived from chiral molecules is usually essential. In this review, three non-classical CPL (NC-CPL) systems that do not use enantiomerically pure molecules are reported: (i) supramolecular organic luminophores composed of achiral organic molecules that can emit CPL without the use of any chiral auxiliaries, (ii) achiral or racemic luminophores that can emit magnetic CPL (MCPL) by applying an external magnetic field of 1.6 T, and (iii) circular dichroism-silent organic luminophores that can emit CPL in the photoexcited state as a cryptochiral CPL system.

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15

Erfurt, G., and M. R. Krbetschek. "A Radioluminescence Study of Spectral and Dose Characteristics of Common Luminophors." Radiation Protection Dosimetry 100, no. 1 (July 1, 2002): 403–6. http://dx.doi.org/10.1093/oxfordjournals.rpd.a005900.

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16

Li, Bin, Yiguang Tian, and Yubai Bai. "Studies on the luminescence properties of CaO·Gd2O3·SiO2:Eu,Bi luminophors." Materials Research Bulletin 24, no. 8 (August 1989): 961–66. http://dx.doi.org/10.1016/0025-5408(89)90179-7.

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17

Glinka, Yu D., T. B. Krak, Yu N. Belyak, V. Ya Degoda, and V. M. Ogenko. "X-ray and photo-luminophors based on SiO2UO22+ adsorption systems." Colloids and Surfaces A: Physicochemical and Engineering Aspects 104, no. 1 (November 1995): 17–27. http://dx.doi.org/10.1016/0927-7757(95)03224-2.

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18

Zhang, Yujian, Jingwei Sun, Gaofeng Bian, Yiyi Chen, Mi Ouyang, Bin Hu, and Cheng Zhang. "Cyanostilben-based derivatives: mechanical stimuli-responsive luminophors with aggregation-induced emission enhancement." Photochemical & Photobiological Sciences 11, no. 9 (2012): 1414. http://dx.doi.org/10.1039/c2pp05404c.

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19

Kubasiewicz, Konrad, Adam Slesinski, Dominika Gastol, Stefan Lis, and Elzbieta Frackowiak. "Electrochemical capacitor materials based on carbon and luminophors doped with lanthanide ions." Journal of Physics D: Applied Physics 50, no. 41 (September 20, 2017): 415502. http://dx.doi.org/10.1088/1361-6463/aa875b.

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20

Bibanina, E. M., V. A. Goryunov, B. N. Denisov, and E. V. Nikishin. "A capacitance technique for the study of trapping centers in powdered luminophors." Technical Physics Letters 26, no. 6 (June 2000): 470–71. http://dx.doi.org/10.1134/1.1262880.

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21

IM, S., G. KHALIL, J. CALLIS, B. AHN, M. GOUTERMAN, and Y. XIA. "Synthesis of polystyrene beads loaded with dual luminophors for self-referenced oxygen sensing." Talanta 67, no. 3 (September 15, 2005): 492–97. http://dx.doi.org/10.1016/j.talanta.2005.06.046.

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22

He, Hai-feng, Xuan-tao Shao, Li-li Deng, Jia-xin Zhou, Yuan-yuan Zhu, Hong-ying Xia, Liang Shen, and Feng Zhao. "Triphenylamine or carbazole-based benzothiadiazole luminophors with remarkable solvatochromism and different mechanofluorochromic behaviors." Tetrahedron Letters 60, no. 47 (November 2019): 150968. http://dx.doi.org/10.1016/j.tetlet.2019.150968.

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23

Yin, Ya, Zhao Chen, Congbin Fan, Gang Liu, and Shouzhi Pu. "1,8-Naphthalimide-Based Highly Emissive Luminophors with Various Mechanofluorochromism and Aggregation-Induced Characteristics." ACS Omega 4, no. 10 (August 20, 2019): 14324–32. http://dx.doi.org/10.1021/acsomega.9b02110.

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24

Katlenok, E. A., and K. P. Balashev. "Influence of platinum metals on spectral and electrochemical characteristics of metallated azole luminophors." Russian Journal of General Chemistry 87, no. 2 (February 2017): 293–99. http://dx.doi.org/10.1134/s1070363217020232.

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25

Mane, K. G., P. B. Nagore, and S. R. Pujari. "Synthesis, Photophysical, Electrochemical and Thermal Study of Biphenyl Luminophors: Green Light Emitting Materials." Journal of Fluorescence 29, no. 1 (December 10, 2018): 177–83. http://dx.doi.org/10.1007/s10895-018-2325-1.

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26

Mane, K. G., P. B. Nagore, and S. R. Pujari. "Synthesis of Novel Blue and Green Light Emitting 4-Nitrophenol Luminophors for Optoelectronics." Journal of Fluorescence 29, no. 6 (November 2019): 1371–80. http://dx.doi.org/10.1007/s10895-019-02447-4.

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27

Doroshenko, A. O., O. A. Ponomarev, and V. G. Mitina. "Theoretical approach to the problem of finding effective luminophors in the isocarbostyril series." Theoretical and Experimental Chemistry 24, no. 4 (1989): 460–64. http://dx.doi.org/10.1007/bf00535122.

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28

Toche, Raghunath B., Muddassar A. Kazi, Shivaraj P. Patil, Shrikant B. Kanawade, and Madhukar N. Jachak. "Synthesis of Quinolone Substituted Pyrazoles, Isoxazoles and Pyridines as a Potential Blue Luminophors." Journal of Fluorescence 20, no. 5 (March 31, 2010): 1129–37. http://dx.doi.org/10.1007/s10895-010-0654-9.

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29

Liu, Xutang, Jianing Yang, Hongliang Liu, Xiaowan Yuan, Gang Liu, and Shouzhi Pu. "Pyromellitic diimide-based luminophors: Tunable aggregation-induced emission (AIE) and reversible mechanofluorochromism characteristics." Journal of Photochemistry and Photobiology A: Chemistry 417 (August 2021): 113344. http://dx.doi.org/10.1016/j.jphotochem.2021.113344.

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30

Gadomska, A. V., A. V. Nevidimov, S. A. Tovstun, O. V. Petrova, L. N. Sobenina, B. A. Trofimov, and V. F. Razumov. "Fluorescence Quenching of 3,5-Diphenyl-8-CF3-BODIPY Luminophores Bearing Aminophenyl Substituents by Aromatic Molecules." High Energy Chemistry 55, no. 3 (May 2021): 179–92. http://dx.doi.org/10.1134/s0018143921030024.

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Abstract It has been found that the fluorescence quantum yield of 3,5-diphenyl-8-CF3-BODIPY luminophores with aminophenyl substituents in aromatic solvents strongly depends on the position of the aniline amino group with respect to the position of attachment to the core of the BODIPY molecule. It has been suggested and substantiated that the reason for quenching of BODIPY meta-isomers is the specific interaction of luminophore molecules with aromatic molecules.

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31

Kosyachenko, L. A., I. K. Vereshchagin, and S. M. Kokin. "Electronic Properties of Cu_xS-ZnS Heterostructure in Zinc Sulphide Luminophors." Solid State Phenomena 51-52 (May 1996): 323–28. http://dx.doi.org/10.4028/www.scientific.net/ssp.51-52.323.

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32

Silva, I. G. N., C. S. Cunha, A. F. Morais, H. F. Brito, and D. Mustafa. "Eu3+ or Sm3+-Doped terbium-trimesic acid MOFs: Highly efficient energy transfer anhydrous luminophors." Optical Materials 84 (October 2018): 123–29. http://dx.doi.org/10.1016/j.optmat.2018.06.065.

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33

LIU, Wei, MingXiao SUN, WenJun YANG, and ShanFeng XUE. "Effect of alkyl chain length on aggregation behaviors and photoelectric properties of organic luminophors." SCIENTIA SINICA Chimica 43, no. 9 (September 1, 2013): 1105–20. http://dx.doi.org/10.1360/032013-196.

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34

Huang, Jing, Xiao Yang, Jinyu Wang, Cheng Zhong, Lei Wang, Jingui Qin, and Zhen Li. "New tetraphenylethene-based efficient blue luminophors: aggregation induced emission and partially controllable emitting color." J. Mater. Chem. 22, no. 6 (2012): 2478–84. http://dx.doi.org/10.1039/c1jm14054j.

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35

Desai, Netaji K., Prasad G. Mahajan, Dhanaji P. Bhopate, Dattatray K. Dalavi, Avinash A. Kamble, Anil H. Gore, Tukaram D. Dongale, Govind B. Kolekar, and Shivajirao R. Patil. "Studies on Structural, Optical, Thermal and Electrical Properties of Perylene-Doped p-terphenyl Luminophors." Journal of Fluorescence 28, no. 1 (October 2, 2017): 51–63. http://dx.doi.org/10.1007/s10895-017-2172-5.

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36

Qian, Lijun, Bin Tong, Shu Sun, Jianbing Shi, Junge Zhi, and Yuping Dong. "Selective detection of phosphaphenanthrenecontaining luminophors with aggregation-induced emission enhancement to transition metal ions." Frontiers of Chemistry in China 6, no. 1 (December 21, 2010): 15–20. http://dx.doi.org/10.1007/s11458-011-0221-1.

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37

Antina, Elena V., Rimma T. Kuznetsova, Lubov A. Antina, Galina B. Guseva, Natalia A. Dudina, Anatolij I. V'yugin, and Alexey V. Solomonov. "New luminophors based on the binuclear helicates of d-METALS with BIS(DIPYRRIN)S." Dyes and Pigments 113 (February 2015): 664–74. http://dx.doi.org/10.1016/j.dyepig.2014.10.002.

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38

Zeng, Qi, Zhen Li, Yongqiang Dong, Chong'an Di, Anjun Qin, Yuning Hong, Li Ji, et al. "Fluorescence enhancements of benzene-cored luminophors by restricted intramolecular rotations: AIE and AIEE effects." Chem. Commun., no. 1 (2007): 70–72. http://dx.doi.org/10.1039/b613522f.

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39

Tepikina, Anna V., and Svetlana G. Vlasova. "Inorganic Composites Luminophors in Lithium-Borate Glasses with Rare-Earth Elements for White-Emitting Diodes." Defect and Diffusion Forum 410 (August 17, 2021): 764–69. http://dx.doi.org/10.4028/www.scientific.net/ddf.410.764.

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The paper describes the synthesis of novel luminescent composite system, based on lithium-borate glass matrix with addition of rare-earth elements and yttrium-aluminum garnet finely divided powder. The new chemical composition of glass has been selected, composite’s fabrication technology was developed, the temperature conditions of glass and luminophore sintering as well. The spectral characteristics of the obtained luminescent composites are measured, and chromaticity diagrams are considered. The radiation spectra showed a maximum of about 560 nm, the maximum spectral intensity of the radiation is about 90 μw/cm2/nm. Powerful energy saving source of white light was produced.

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40

Sokulskaya, N. N., V. M. Ischenko, and A. F. Golota. "CRYSTAL CHEMICAL ANALYSIS OF THE GARNET LUMINOPHORS FOR LIGHT-EMITTING DIODES OF WHITE COLOR LUMINESCENCE." Vestnik Yuzhnogo nauchnogo tsentra 1, no. 4 (2005): 26–29. http://dx.doi.org/10.23885/1813-4289-2005-1-4-26-29.

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41

Samoilenko, S. O., E. V. Tretyak, S. E. Kichanov, G. P. Shevchenko, E. V. Frolova, D. P. Kozlenko, L. A. Bulavin, G. E. Malashkevich, and B. N. Savenko. "Neutron and Optical Researches of Multicomponent Crystalline Y3Al5O12:Ce3+/Lu2O3 and Lu3Al5O12:Ce3+/Lu2O3 luminophors." Ukrainian Journal of Physics 59, no. 9 (September 2014): 901–5. http://dx.doi.org/10.15407/ujpe59.09.0901.

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42

Mane, K. G., P. B. Nagore, and S. R. Pujari. "Photophysical and structural aspects of perylene‐doped 2‐naphthol luminophors: Green emission by exciplex formation." Luminescence 35, no. 2 (November 12, 2019): 292–98. http://dx.doi.org/10.1002/bio.3726.

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43

Bryukhanov, V. V., I. G. Samusev, and A. M. Ivanov. "Anomalous diffusion accompanying triplet-triplet excitation-energy transport between luminophors at a solid-liquid boundary." Journal of Optical Technology 72, no. 12 (December 1, 2005): 900. http://dx.doi.org/10.1364/jot.72.000900.

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44

Zobov, E. M., M. E. Zobov, Kh E. Kamaludinova, and M. A. Rizakhanov. "Electron Traps with a Wide Range of Capture Cross Sections in Powdery ZnS-Based Luminophors." Journal of Applied Spectroscopy 72, no. 2 (March 2005): 213–17. http://dx.doi.org/10.1007/s10812-005-0057-x.

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45

Guo, Kunpeng, Zhixiang Gao, Jun Cheng, Yang Shao, Xiaoqing Lu, and Hua Wang. "Linear thiophene-containing π-conjugated aldehydes with aggregation-induced emission for building solid red luminophors." Dyes and Pigments 115 (April 2015): 166–71. http://dx.doi.org/10.1016/j.dyepig.2014.12.017.

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46

Moraitis, Panagiotis, Gijs Leeuwen, and Wilfried Sark. "Visual Appearance of Nanocrystal-Based Luminescent Solar Concentrators." Materials 12, no. 6 (March 16, 2019): 885. http://dx.doi.org/10.3390/ma12060885.

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The luminescent solar concentrator (LSC) is a promising concept for the integration of photovoltaic (PV) generators into the building envelope. Having the form of semitransparent plates, LSCs offer a high degree of flexibility and can be used as windows or facades, as part of the of building-integrated photovoltaic (BIPV) industry. Existing performance characterizations of LSC devices focus almost exclusively on electric power generation. However, when used as window components, the transmitted spectrum can alter the color, potentially affecting the visual comfort of the occupants by altering the properties of the sunlight. In this study, eight different state-of-the-art nanocrystals are evaluated as potential candidates for LSC window luminophores, using Monte Carlo simulations. The transparency of each LSC window varies between 90% and 50%, and the color-rendering properties are assessed with respect to the color rendering index (CRI) and the correlated color temperature (CCT). It is found that luminophores with a wide absorption bandwidth in the visible spectrum can maintain a high CRI value (above 85) and CCT values close to the Planckian locus, even for high luminophore concentrations. In contrast, luminophores that only absorb partly in the visible spectrum suffer from color distortion, a situation characterized by low CCT and CRI values, even at high transmittance.

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47

Kusyak, A. P., A. L. Petranovska, S. P. Turanska, O. I. Oranska, Yu M. Shuba, D. I. Kravchuk, L. I. Kravchuk, et al. "Synthesis and properties of nanostructures based on lanthanum fluoride for photodynamic therapy of tumors of the cranial cavity and bone tissue." Himia, Fizika ta Tehnologia Poverhni 12, no. 3 (September 30, 2021): 216–25. http://dx.doi.org/10.15407/hftp12.03.216.

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The aim of the work is the synthesis of nanostructures based on lanthanum fluoride, promising for use in photodynamic therapy of tumors in organs of cranial cavity and bone tissues; a study of their structural properties and luminescence spectra. Synthesis of LaF3:Tb3+ was carried out by coprecipitation of components from aqueous and alcoholic (methanol) solution. As precursors were used: La(NO3)3×6H2O, TbCl3, NH4F. All reagents have qualification “chemically pure”. Distilled water and methanol were used as solvent. The synthesis of nanosized magnetite in the single-domain state was performed by the Elmore method. Synthesized nanodisperse samples are characterized by XRD analysis, DTGA, TEM. The magnetic properties and spectra of UV luminescence were also studied. It has been found that the XRD-patterns of LaF3:Tb3+ samples synthesized in water and methanol do not differ fundamentally. Under the experimental conditions, the most perfect crystals of hexagonal syngony were formed during crystallization in an autoclave. Their average size was ~ 15 nm. In TEM images, the length of the crystals exceeds the width by 3–4 times. Crystals are prone to aggregation and the formation of chain structures. The UV luminescence spectrum of the synthesized nanodisperse samples in aqueous medium at the concentration of 0.5 mg/ml and excited by ultraviolet radiation is characteristic of the structure of LaF3:Tb3+. Ensembles of particles Fe3O4/LaF3:Tb3+ NCs were synthesized. Transmission electron microscopy has shown that the shapes of particles of NCs and LaF3:Tb3+ nanocrystals are fundamentally different. Particles of Fe3O4/LaF3:Tb3+ NCs have a spherical shape, which is characteristic of structures of the core-shell type. X-ray diffraction patterns of NCs confirm this conclusion. The conditions for the synthesis of NCs did not significantly change the magnetic properties of their nuclei, single-domain Fe3O4 nanoparticles (NPs). The luminescence spectrum of Fe3O4/LaF3:Tb3+ NCs differs significantly from the spectrum of samples of nanodispersed LaF3:Tb3+ both in intensity and in the structure of the bands. These spectral differences may be due to differences in structure, features of the nanocrystalline structure, the content of the LaF3:Tb3+ scintillator and Tb3+ ions in samples of LaF3:Tb3+ nanocrystals and shells of Fe3O4/LaF3:Tb3+ nanocomposites. Composites of dispersed 60S bioglass with nanodispersed crystalline LaF3:Tb3+ in the dry state, and distilled water, showed the presence of luminescence upon excitation by UV radiation. The results of research show the prospects of the synthesized nanodispersed luminophors LaF3:Tb3+, for use as a source of luminescent radiation in optopharmacology and photodynamic therapy of tumors in organs of cranial cavity and bone tissues. Optimization of luminescent properties of the original nanodispersed luminophors, their compositions with bioactive glass, luminescent shells in the composition of magnetosensitive NCs, as well as the technology of manufacturing of these structures will significantly allow us to improve their performance characteristics. The results of the work indicate the prospects of the synthesized structures for further research under the conditions of excitation by high-permeability “soft” X-ray radiation for use in optopharmacology and photodynamic therapy of tumors in organs of cranial cavity and bone tissues. Optimization of properties of the original nanodispersed luminophors, their compositions with bioactive glass and magnetosensitive carriers Fe3O4 will allow us to improve significantly their performance characteristics.

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48

Fujiki, Michiya, Julian Koe, Takashi Mori, and Yoshihiro Kimura. "Questions of Mirror Symmetry at the Photoexcited and Ground States of Non-Rigid Luminophores Raised by Circularly Polarized Luminescence and Circular Dichroism Spectroscopy: Part 1. Oligofluorenes, Oligophenylenes, Binaphthyls and Fused Aromatics." Molecules 23, no. 10 (October 11, 2018): 2606. http://dx.doi.org/10.3390/molecules23102606.

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We report experimental tests of whether non-rigid, π-conjugated luminophores in the photoexcited (S1) and ground (S0) states dissolved in achiral liquids are mirror symmetrical by means of circularly polarized luminescence (CPL) and circular dichroism (CD) spectroscopy. Herein, we chose ten oligofluorenes, eleven linear/cyclic oligo-p-arylenes, three binaphthyls and five fused aromatics, substituted with alkyl, alkoxy, phenyl and phenylethynyl groups and also with no substituents. Without exception, all these non-rigid luminophores showed negative-sign CPL signals in the UV-visible region, suggesting temporal generation of energetically non-equivalent non-mirror image structures as far-from equilibrium open-flow systems at the S1 state. For comparison, unsubstituted naphthalene, anthracene, tetracene and pyrene, which are achiral, rigid, planar luminophores, did not obviously show CPL/CD signals. However, camphor, which is a rigid chiral luminophore, showed mirror-image CPL/CD signals. The dissymmetry ratio of CPL (glum) for the oligofluorenes increased discontinuously, ranging from ≈ −(0.2 to 2.0) × 10−3, when the viscosity of the liquids increased. When the fluorene ring number increased, the glum value extrapolated at [η] = 0 reached −0.8 × 10−3 at 420 nm, leading to (–)-CPL signals predicted in the vacuum state. Our comprehensive CPL and CD study should provide a possible answer to the molecular parity violation hypothesis arising due to the weak neutral current mediated by the Z0-boson.

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Mar’ina, Ul’ana A., Viktor A. Vorob’ev, and Alexandr P. Mar’in. "IR luminescence of CaGa 2O 4 : Yb 3+ excited by 940 and 980 nm radiation." Modern Electronic Materials 6, no. 1 (March 30, 2020): 31–36. http://dx.doi.org/10.3897/j.moem.6.1.55165.

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Existing calcium gallate CaGa2O4 based luminescent materials radiating in visible IR region have been reviewed. IR luminophores have been studied but slightly but their practical implementation is of interest. CaGa2O4 specimens activated with Yb3+ rare-earth ions have been synthesized using the solid-state method. The structure and luminescent properties of CaGa2O4 : Yb3+ have been studied. CaGa2O4 : Yb3+ excitation with 940 and 980 nm radiation generates luminescence in the 980–1100 nm region. Data on the electron level structure in Yb3+ ions suggest that the excitation and luminescence occur directly in the Yb3+ ions with only a passive role of the base lattice. The luminescence spectra contain three peaks at 993, 1025 and 1080 nm. These luminescence peaks are caused by electron optical transitions from excited to main state in Yb3+ ions. 993 nm band luminescence intensity has been studied as a function of Yb3+ activator ions concentration. Introduction of Na+ ions into the luminophore increases IR luminescence intensity. Optimum (Ca1-x-yYbxNay)Ga2O4 luminophore composition has been suggested at which the 993 nm luminescence intensity is the highest.

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Yin, Ya, Hao Hu, Zhao Chen, Hongliang Liu, Congbin Fan, and Shouzhi Pu. "Tetraphenylethene or triphenylethylene-based luminophors: Tunable aggregation-induced emission (AIE), solid-state fluorescence and mechanofluorochromic characteristics." Dyes and Pigments 184 (January 2021): 108828. http://dx.doi.org/10.1016/j.dyepig.2020.108828.

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