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Journal articles on the topic 'Upconversion phosphor'

Author: Grafiati

Published: 4 June 2021

Last updated: 7 February 2022

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1

Chen, Daqin, Yang Zhou, Wei Xu, Jiasong Zhong, and Ping Huang. "Persistent and photo-stimulated luminescence in Ce3+/Cr3+ activated Y3Al2Ga3O12 phosphors and transparent phosphor-in-glass." Journal of Materials Chemistry C 4, no. 48 (2016): 11457–64. http://dx.doi.org/10.1039/c6tc04140j.

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Ce³⁺/Cr³⁺ activated Y₃Al₂Ga₃O₁₂ phosphors and transparent phosphor-in-glass show bright persistent and photostimulated upconversion luminescence.

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2

Sun, Jia Yue, Bing Xue, Qiu Mei Di, Qi Guang Xu, and Liu Han. "Hydrothermal Synthesis and Upconversion Properties of Yb³⁺, Tm³⁺ Co-Doped Gd₆MoO₁₂ Phosphor with Regular Morphologies." Applied Mechanics and Materials 597 (July 2014): 109–12. http://dx.doi.org/10.4028/www.scientific.net/amm.597.109.

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Yb3+, Tm3+ co-doped Gd6MoO12 phosphors were prepared by the hydrothermal method. After tuning the PH value and EDTA, phosphors present different morphologies including hexagonal prisms, spindles, and spheres. Under 980nm excitation, the upconversion luminescence properties of the as-prepared phosphors are studied based on changing the synthesis condition. It is found that usage of EDTA and pH changing both play crucial key in the formation of morphology. Pumping power on the UC luminescence properties and level diagram mechanism of Gd6MoO12:Yb3+/Tm3+phosphor have also been discussed.

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3

DWIVEDI, Y., and S. B. RAI. "PHOTON AVALANCHE UPCONVERSION EMISSION IN Ho:Gd2O3 NANOPHOSPHOR." International Journal of Nanoscience 10, no. 04n05 (August 2011): 925–28. http://dx.doi.org/10.1142/s0219581x11008782.

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This paper report, the structural and spectroscopic properties of Gd2O3 nano-phosphor activated with Ho3+ ions. XRD, SEM and TEM techniques have been used for the structural characterizations. The phosphor contains spherical nanocrystallites with uniform size of ~40 nm. Enhanced IR to green and red photon avalanche upconversion is reported under 976 nm laser excitations. Further, annealing shows a significant improvement in emission intensity. Temporal evolution of upconversion emission intensity were measured which suggests the photon-avalanche mechanism is responsible for the upconversion process. The enhancement of emission was explained and the photo-physics involved is correlated with the unique structural properties of the crystallites formed.

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4

Tyagi, Neetu, A. Amarnath Reddy, and R. Nagarajan. "KLaF4:Er an efficient upconversion phosphor." Optical Materials 33, no. 1 (November 2010): 42–47. http://dx.doi.org/10.1016/j.optmat.2010.07.014.

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5

do Nascimento, J. P. C., A. J. M. Sales, D. G. Sousa, M. A. S. da Silva, S. G. C. Moreira, K. Pavani, M. J. Soares, M. P. F. Graça, J. Suresh Kumar, and A. S. B. Sombra. "Temperature-, power-, and concentration-dependent two and three photon upconversion in Er3+/Yb3+ co-doped lanthanum ortho-niobate phosphors." RSC Advances 6, no. 72 (2016): 68160–69. http://dx.doi.org/10.1039/c6ra12941b.

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6

Kim, Young Moon, Chang Seob Kim, and Hyung Wook Choi. "Improving Performance of Dye-Sensitized Solar Cell by Multi-Emission Effect of Phosphors." Journal of Nanoscience and Nanotechnology 15, no. 10 (October 1, 2015): 8171–75. http://dx.doi.org/10.1166/jnn.2015.11282.

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Generally, the N-719 dye, used in dye-sensitized solar cells (DSSCs), only absorbs visible light in the wavelength range from 400 to 700 nm. Consequently, most of the ultraviolet and infrared rays from the sun are not utilized by this dye. However, ultraviolet and infrared rays can be converted to visible light by upconversion luminescence. Such visible light can then be reabsorbed by the dye, allowing for a larger range of solar irradiation to be utilized in DSSCs. Phosphor (ZnGa2O4, Y2O3:Er3+), acting as a luminescence medium, was added to the TiO2 electrode of DSSCs, and owing to the effect of upconversion, it increased their photocurrent density and efficiency. Phosphor (ZnGa2O4, Y2O3:Er3+) co-doped TiO2 electrode cells showed better performance than phosphorfree cells. In fact, the highest efficiency observed for a DSSC containing five phosphor layers was 7.03% with a short-circuit current density (Jsc) of 15.62 mA/cm2, an open circuit voltage (Voc) of 0.661 V, and a fill factor (FF) of 68.17%.

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7

Fan, Wei, Xiyan Zhang, Lixin Chen, and Liping Lu. "Preparation of Gd2O2S:Er3+,Yb3+ phosphor and its multi-wavelength sensitive upconversion luminescence mechanism." CrystEngComm 17, no. 8 (2015): 1881–89. http://dx.doi.org/10.1039/c4ce02243b.

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8

Sun, Jia Yue, Bing Xue, Guang Chao Sun, and Dian Peng Cui. "Yellow Upconversion Luminescence in Ho³⁺/Yb³⁺ Co-Doped La₂(WO₄)₃ Phosphor." Applied Mechanics and Materials 401-403 (September 2013): 758–61. http://dx.doi.org/10.4028/www.scientific.net/amm.401-403.758.

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The strong yellow upconversion (UC) light emission has been observed in Ho3+/Yb3+ co-doped La2(WO4)3 phosphor under the excitation of 980 nm diode laser. The phosphors were synthesized by the traditional solid-state reaction method. The phrase structures of the samples were characterized by X-ray diffraction (XRD). The doping concentration of Yb3+ was determined to be 20mol% for the strongest yellow emission. Then, the dependence of UC emission intensity on excitation power density showed that the green and red UC emissions are involved in two-photon process. The possible UC mechanisms for the strong yellow emission were also investigated.

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9

Maurya, A., R. S. Yadav, R. V. Yadav, S. B. Rai, and A. Bahadur. "Enhanced green upconversion photoluminescence from Ho3+/Yb3+ co-doped CaZrO3 phosphor via Mg2+ doping." RSC Advances 6, no. 114 (2016): 113469–77. http://dx.doi.org/10.1039/c6ra23835a.

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This paper reports enhanced green upconversion photoluminescence from Ho³⁺/Yb³⁺ co-doped CaZrO₃ phosphor via Mg²⁺ doping synthesized through a solid state reaction method.

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10

Li, Peng, Linna Guo, Chenxi Liang, Tiesheng Li, Penglei Chen, Minghua Liu, and Yangjie Wu. "Effects of optical-inert ions on upconversion luminescence and temperature sensing properties of ScVO4:10%Yb3+/2%Er3+ nano/micro-particles." RSC Advances 7, no. 81 (2017): 51233–44. http://dx.doi.org/10.1039/c7ra10035c.

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One Stone Two Birds: optically inert ions, especially Li⁺/Gd³⁺ co-doping improved upconversion luminescence and temperature sensitivity of ScVO₄:10%Yb³⁺/2%Er³⁺ phosphor.

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11

Wu, Hao, Zhendong Hao, Liangliang Zhang, Xia Zhang, Yu Xiao, Guo-Hui Pan, Huajun Wu, Yongshi Luo, Ligong Zhang, and Jiahua Zhang. "Er3+/Yb3+ codoped phosphor Ba3Y4O9 with intense red upconversion emission and optical temperature sensing behavior." Journal of Materials Chemistry C 6, no. 13 (2018): 3459–67. http://dx.doi.org/10.1039/c7tc05796b.

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Bright red upconversion phosphor Ba₃Y₄O₉:Er³⁺/Yb³⁺ and dual-color complementary optical thermometry to maintain relatively high sensitivities over a wide temperature scope.

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12

Kohei, Soga, Koizumi Ryo, Yamada Masayoshi, Matsuura Daisuke, and Nagasaki Yukio. "Preparation of Polymer Composite Upconversion Phosphor from Inorganic Particles." Journal of Photopolymer Science and Technology 18, no. 1 (2005): 73–74. http://dx.doi.org/10.2494/photopolymer.18.73.

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13

Dey, Riya, Vineet Kumar Rai, and Anurag Pandey. "Green upconversion emission in Nd3+–Yb3+–Zn2+:Y2O3 phosphor." Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy 99 (December 2012): 288–91. http://dx.doi.org/10.1016/j.saa.2012.09.001.

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14

Wang, Fei, Bin Yang, Qingchun Yu, Dachun Liu, and Wenhui Ma. "Cooperative upconversion luminescence of Er3+ in Gd2O3−xSx phosphor." Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy 190 (February 2018): 312–17. http://dx.doi.org/10.1016/j.saa.2017.09.023.

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15

Rai, Vineet Kumar, Riya Dey, and Kaushal Kumar. "White upconversion emission in Y2O3:Er3+–Tm3+–Yb3+phosphor." Materials Research Bulletin 48, no. 6 (June 2013): 2232–36. http://dx.doi.org/10.1016/j.materresbull.2013.02.064.

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16

Wang, Fei, Bin Yang, Xiumin Chen, Wenhui Ma, and Baoqiang Xu. "Color-tunable and upconversion luminescence of Gd2O2S:Er,Tb phosphor." Materials Chemistry and Physics 169 (February 2016): 113–19. http://dx.doi.org/10.1016/j.matchemphys.2015.11.037.

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17

Wang, Xiangfu, Siguo Xiao, Yanyan Bu, Xiaoliang Yang, and J. W. Ding. "β-Na(Y1.5Na0.5)F6:Tm3+—A blue upconversion phosphor." Journal of Luminescence 129, no. 3 (March 2009): 325–27. http://dx.doi.org/10.1016/j.jlumin.2008.10.012.

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18

Enachi, Angela, Octavian Toma, and Şerban Georgescu. "Luminescent Er3+ centers in CaSc2O4:Er3+:Yb3+ upconversion phosphor." Journal of Luminescence 231 (March 2021): 117816. http://dx.doi.org/10.1016/j.jlumin.2020.117816.

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19

Liao, Jin Sheng, Hang Ying You, Qing Xia Wu, He Rui Wen, Jing Lin Chen, and Rui Jin Hong. "Blue Upconversion Luminescence Properties of La₂(WO₄)₃:Yb³⁺/Tm³⁺Phosphor." Advanced Materials Research 399-401 (November 2011): 1020–25. http://dx.doi.org/10.4028/www.scientific.net/amr.399-401.1020.

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Monoclinic La2(WO4)3 nanophosphors codoped with Tm3+ and Yb3+ ions were synthesized via hydrothermal process followed by heat treatment. Powder X-ray diffraction (XRD) and scanning electron microscopy (SEM) were used to characterize as-prepared samples. The dependences of Yb3+/ concentration and laser pumping power on the upconversion emissions were extensively investigated. The results show that upconversion luminescence increases with the Yb3+/ concentration and gets its peak at 30 %. The upconversion mechanism and process in the Yb3+/Tm3+ codoped La2(WO4)3 phosphors were analysed.

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20

Li, Jin Kai, Ji Guang Li, Shao Hong Liu, Xiao Dong Li, Xu Dong Sun, and Yoshio Sakka. "Luminescence Behaviors of the New Upconversion Phosphors of Yb/Ho Co-Doped (Gd_1-xLu_x)₃Al₅O₁₂ (x=0.1-0.5) Garnet Solid Solutions." Key Engineering Materials 602-603 (March 2014): 1034–38. http://dx.doi.org/10.4028/www.scientific.net/kem.602-603.1034.

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The metastable garnet lattice of Gd3Al5O12 (GdAG) was effectively stabilized via doping with significantly smaller Lu3+, and based on which (Gd,Lu)AG:Yb/Ho was developed in this work as a new type of upconversion phosphor. The phosphor particles calcined from the precursors synthesized via carbonate precipitation were observed to have good dispersion and fairly uniform morphologies. Optical spectroscopy found that the [(Gd1-xLux)0.948Yb0.05Ho0.002]3Al5O12 (x=0.1-0.5) garnet powders exhibit a green emission centered at ~543 nm (the 5F4,5S25I8 transition of Ho3+) and a red emission centered at ~668 nm (the 5F55I8 transition of Ho3+) under laser excitation at 978 nm. The upconversion emission intensity was found to decrease with increasing Lu3+ doping. Meanwhile, the dependence of up-conversion emission intensity on the pumping power was measured and the up-conversion mechanism was discussed in detail. The Yb/Ho codoped (Gd,Lu)AG garnet system developed herein may potentially be used as a new type of luminescent material.

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21

Kim, Do Rim, Sung Wook Park, Byung Kee Moon, Sung Heum Park, Jung Hyun Jeong, Haeyoung Choi, and Jung Hwan Kim. "The role of Yb3+ concentrations on Er3+ doped SrLaMgTaO6 double perovskite phosphors." RSC Advances 7, no. 3 (2017): 1464–70. http://dx.doi.org/10.1039/c6ra24808j.

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The upconversion photoluminescence (UCPL) spectra of SrLaMgTaO₆:Er³⁺/Yb³⁺ phosphor with different concentration of Yb³⁺ ion under a 975 nm excitation and the insert shows the downconversion photoluminescence (DCPL) spectra under a 355 nm excitation.

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22

Monika, Monika, Ram Sagar Yadav, Amresh Bahadur, and Shyam Bahadur Rai. "Concentration and pump power-mediated color tunability, optical heating and temperature sensing via TCLs of red emission in an Er3+/Yb3+/Li+ co-doped ZnGa2O4 phosphor." RSC Advances 9, no. 68 (2019): 40092–108. http://dx.doi.org/10.1039/c9ra09120c.

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The Er³⁺/Yb³⁺/Li⁺ co-doped ZnGa₂O₄ phosphor gives intense red upconversion photoluminescence, color tunability with Er³⁺ ion concentration and incident pump power, R/G ratio, induced optical heating and temperature sensing characteristics.

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23

Yadav, R. V., S. K. Singh, and S. B. Rai. "Effect of the Li+ ion on the multimodal emission of a lanthanide doped phosphor." RSC Advances 5, no. 33 (2015): 26321–27. http://dx.doi.org/10.1039/c4ra17315e.

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The present study probes the multimodal emission: upconversion, photoluminescence and quantum cutting processes in a Ho³⁺/Yb³⁺ co-doped Y₂O₃ phosphor and further examines the impact of the Li⁺ ion on the multi-modal emission, for the first time.

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24

Sinha, Shriya, Manoj Kumar Mahata, Kaushal Kumar, S. P. Tiwari, and V. K. Rai. "Dualistic temperature sensing in Er3+/Yb3+ doped CaMoO4 upconversion phosphor." Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy 173 (February 2017): 369–75. http://dx.doi.org/10.1016/j.saa.2016.09.039.

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25

Pires, Ana Maria, Osvaldo Antonio Serra, Stephan Heer, and Hans Ulrich Güdel. "Low-temperature upconversion spectroscopy of nanosized Y2O3:Er,Yb phosphor." Journal of Applied Physics 98, no. 6 (September 15, 2005): 063529. http://dx.doi.org/10.1063/1.2058195.

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26

Krishnan, Rajagopalan, Samvit G. Menon, Dirk Poelman, Robin E. Kroon, and Hendrik C. Swart. "Power-dependent upconversion luminescence properties of self-sensitized Er2WO6 phosphor." Dalton Transactions 50, no. 1 (2021): 229–39. http://dx.doi.org/10.1039/d0dt03081c.

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27

Tian, Xiuna, Hongjian Dou, and Lingyuan Wu. "Photoluminescence and thermometry properties of upconversion phosphor NaBiF4: Yb3+/Tm3+." Optical Materials 99 (January 2020): 109544. http://dx.doi.org/10.1016/j.optmat.2019.109544.

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28

Kumari, Astha, Vineet Kumar Rai, and Kaushal Kumar. "Yellow–orange upconversion emission in Eu3+–Yb3+ codoped BaTiO3 phosphor." Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy 127 (June 2014): 98–101. http://dx.doi.org/10.1016/j.saa.2014.02.023.

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29

SUN, Jiayue, Bing XUE, Guangchao SUN, and Dianpeng CUI. "Yellow upconversion luminescence in Ho3+/Yb3+ co-doped Gd2Mo3O9 phosphor." Journal of Rare Earths 31, no. 8 (August 2013): 741–44. http://dx.doi.org/10.1016/s1002-0721(12)60351-2.

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30

Yang, Yanmin, Chao Mi, Fuyun Jiao, Xianyuan Su, Xiaodong Li, Linlin Liu, Jiao Zhang, Fang Yu, Yanzhou Liu, and Yaohua Mai. "A Novel Multifunctional Upconversion Phosphor: Yb3+ /Er3+ Codoped La2 S3." Journal of the American Ceramic Society 97, no. 6 (February 4, 2014): 1769–75. http://dx.doi.org/10.1111/jace.12822.

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31

Huang, Lijun, Lili Wang, Xiaojie Xue, Dan Zhao, Guanshi Qin, and Weiping Qin. "Enhanced Red Upconversion Luminescence in Er–Tm Codoped NaYF4 Phosphor." Journal of Nanoscience and Nanotechnology 11, no. 11 (November 1, 2011): 9498–501. http://dx.doi.org/10.1166/jnn.2011.5255.

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32

Ohwaki, J., and Y. Wang. "New efficient upconversion phosphor BaCl2:Er under 1.5 μm excitation." Electronics Letters 29, no. 4 (1993): 351. http://dx.doi.org/10.1049/el:19930237.

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33

Yalan, Bian, and Zhuang Yunfei. "Upconversion luminescence and optical thermometry of Pr3+-doped KLu2F7 phosphor." Journal of Materials Science: Materials in Electronics 31, no. 10 (April 6, 2020): 7991–97. http://dx.doi.org/10.1007/s10854-020-03339-1.

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34

Kshetri, Yuwaraj K., Jeong Sang Hoon, Tae-Ho Kim, Tohru Sekino, and Soo Wohn Lee. "Yb3+, Er3+ and Tm3+ doped α-Sialon as upconversion phosphor." Journal of Luminescence 204 (December 2018): 485–92. http://dx.doi.org/10.1016/j.jlumin.2018.08.027.

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35

Soni, Abhishek Kumar, and Vineet Kumar Rai. "Intrinsic optical bistability and frequency upconversion in Tm3+–Yb3+-codoped Y2WO6 phosphor." Dalton Trans. 43, no. 36 (2014): 13563–70. http://dx.doi.org/10.1039/c4dt01266f.

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36

Shahzad, Muhammad Khuram, Yundong Zhang, Lugui Cui, Lu Liu, Mehwish Khalid Butt, and Hanyang Li. "Dispersing upconversion nanocrystals in PMMA microfiber: a novel methodology for temperature sensing." RSC Advances 8, no. 35 (2018): 19362–68. http://dx.doi.org/10.1039/c8ra01146j.

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The synthesis of a β-NaYF₄:Yb³⁺/Tm³⁺ phosphor by a thermal decomposition method, focusing on the fabrication of microfibers by the co-doping of nanocrystals with PMMA solution.

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37

Luitel, Hom Nath, Rumi Chand, Toshio Torikai, Mitsunori Yada, and Takanori Watari. "Highly efficient NIR–NIR upconversion in potassium substituted CaMoO4:Tm3+, Yb3+ phosphor for potential biomedical applications." RSC Advances 5, no. 22 (2015): 17034–40. http://dx.doi.org/10.1039/c4ra12436g.

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38

Maurya, S. K., S. P. Tiwari, A. Kumar, and K. Kumar. "Plasmonic enhancement of upconversion emission in Ag@NaYF4:Er3+/Yb3+ phosphor." Journal of Rare Earths 36, no. 9 (September 2018): 903–10. http://dx.doi.org/10.1016/j.jre.2018.03.003.

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39

Eun, Seong-Rak, Shielah Mavengere, Bumrae Cho, and Jung-Sik Kim. "Photocatalytic Reactivity of Carbon–Nitrogen–Sulfur-Doped TiO2 Upconversion Phosphor Composites." Catalysts 10, no. 10 (October 15, 2020): 1188. http://dx.doi.org/10.3390/catal10101188.

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Sol–gel synthesized N-doped and carbon–nitrogen–sulfur (CNS)-doped TiO2 solutions were deposited on upconversion phosphor using a dip coating method. Scanning electron microscopy (SEM) imaging showed that there was a change in the morphology of TiO2 coated on NaYF4:Yb,Er from spherical to nanorods caused by additional urea and thiourea doping reagents. Fourier transform infrared (FTIR) spectroscopy further verified the existence of nitrate–hyponitrite, carboxylate, and SO42− because of the doping effect. NaYF4:Yb,Er composites coated with N- and CNS-doped TiO2 exhibited a slight shift of UV-Vis spectra towards the visible light region. Photodecomposition of methylene blue (MB) was evaluated under 254 nm germicidal lamps and a 300 W Xe lamp with UV/Vis cut off filters. The photodegradation of toluene was evaluated on TiO2/NaYF4:Yb,Er and CNS-doped TiO2/NaYF4:Yb,Er samples under UV light illumination. The photocatalytic reactivity with CNS-doped TiO2/NaYF4:Yb,Er surpassed that of the undoped TiO2/NaYF4:Yb,Er for the MB solution and toluene. Photocatalytic activity is increased by CNS doping of TiO2, which improves light sensitization as a result of band gap narrowing due to impurity sites.

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40

Luo, Xi-xian, and Wang-he Cao. "Upconversion luminescence of holmium and ytterbium co-doped yttrium oxysulfide phosphor." Materials Letters 61, no. 17 (July 2007): 3696–700. http://dx.doi.org/10.1016/j.matlet.2006.12.021.

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41

Pandey, Anurag, Vineet Kumar Rai, Riya Dey, and Kaushal Kumar. "Enriched green upconversion emission in combustion synthesized Y2O3:Ho3+–Yb3+ phosphor." Materials Chemistry and Physics 139, no. 2-3 (May 2013): 483–88. http://dx.doi.org/10.1016/j.matchemphys.2013.01.043.

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42

Cockroft, Nigel J. "Application of energy upconversion spectroscopy to novel laser and phosphor design." Journal of Alloys and Compounds 207-208 (June 1994): 33–40. http://dx.doi.org/10.1016/0925-8388(94)90172-4.

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43

Kim, MaengJun, and SangHo Sohn. "Effect of NaF Removal on the Upconversion Phosphor NaYF4:Yb3+, Tm3+." Journal of Nanoscience and Nanotechnology 19, no. 3 (March 1, 2019): 1399–402. http://dx.doi.org/10.1166/jnn.2019.16164.

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44

Das, Subrata, A. Amarnath Reddy, and G. Vijaya Prakash. "Strong green upconversion emission from Er3+–Yb3+ co-doped KCaBO3 phosphor." Chemical Physics Letters 504, no. 4-6 (March 2011): 206–10. http://dx.doi.org/10.1016/j.cplett.2011.02.004.

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45

Xue, Bing, and Jiayue Sun. "Upconversion emission properties and tunable morphologies of Y6WO12:Yb3+/Er3+ phosphor." Infrared Physics & Technology 62 (January 2014): 45–49. http://dx.doi.org/10.1016/j.infrared.2013.11.001.

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46

Sun, Panpan, Pengpeng Dai, Jikai Yang, Chengjiu Zhao, and Xintong Zhang. "Enhanced upconversion luminescence induced by structrual evolution of lanthanum niobate phosphor." Ceramics International 41, no. 2 (March 2015): 3009–16. http://dx.doi.org/10.1016/j.ceramint.2014.10.136.

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47

Sun, Jia Yue, Chun Cao, and Hai Yan Du. "Yellow-Orange Upconversion Luminescence in NaYF₄:Er³⁺, Yb³⁺ Phosphor Synthesized by Microwave Combustion Method." Advanced Materials Research 295-297 (July 2011): 551–54. http://dx.doi.org/10.4028/www.scientific.net/amr.295-297.551.

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Erbium and ytterbium co-doped sodium yttrium fluoride (NaYF4:Er3+,Yb3+) was synthesized by combusting in home microwave oven directly. The structure and morphology of the sample was characterized by the X-ray diffraction (XRD) and scanning electron microscopy (SEM), and its upconversion luminescence properties were investigated in detail. Under 980nm semiconductor laser excitation, the color of upconversion luminescence of NaYF4:Er3+,Yb3+ was green and red, and its upconversion spectrum exhibited distinct emission peaks at 522, 543 and 652 nm, the emission appears yellow-orange to the naked eye. The law of luminescence intensity versus pump power proved that the intense green emission at 522 and 543 nm were from Er3+(2H11/2→4I15/2and4S3/2→4I15/2), and the weaker red emission at 652 nm was from Er3+(4F9/2→4I15/2), which belong to the two photon process.

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48

Sun, Jia Yue, Bing Xue, Guang Chao Sun, Dian Peng Cui, and Hai Yan Du. "Blue Upconversion Luminescence from Phosphor Tm³⁺/Yb³⁺ Co-Doped Gd₂Mo₃O₉." Advanced Materials Research 683 (April 2013): 3–6. http://dx.doi.org/10.4028/www.scientific.net/amr.683.3.

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The upconversion (UC) luminescence properties of phosphor Tm3+/Yb3+co-doped Gd2Mo3O9were investigated in detail. Tm3+/Yb3+co-doped Gd2Mo3O9was prepared by solid-state reaction method using Na2CO3as flux and characterized by powder X-ray diffractometry. Under 980nm excitation, Tm3+/Yb3+co-doped Gd2Mo3O9has exhibited a weak red emission near 651nm and strong blue emission at 476nm. Tm3+/Yb3+co-doped Gd2Mo3O9phosphor has been considered as a better candidate in solid-state lighting applications.

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49

Пустоваров, В. А., Е. С. Трофимова, Ю. А. Кузнецова, and А. Ф. Зацепин. "Антистоксова люминесценция нанокристаллов Gd-=SUB=-2-=/SUB=-O-=SUB=-3-=/SUB=-, легированных ионами Er-=SUP=-3+-=/SUP=- и Yb-=SUP=-3+-=/SUP=-." Письма в журнал технической физики 44, no. 14 (2018): 42. http://dx.doi.org/10.21883/pjtf.2018.14.46343.17315.

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Abstract:

AbstractThe upconversion luminescence (UCL) of nanocrystalline gadolinium oxide (Gd_2O_3) doped with Er^3+ and Yb^3+ ions has been studied in the temperature range of 90–400 K. The nanocrystals were synthesized by chemical vapor deposition and possessed a cubic crystalline structure with an average particle size within 48–57 nm. It is established that the USL intensity in the red (^4 F _9/2 → ^4 I _15/2 transition in Er3+ ion) and green (^4 S _3/2 → ^4 I _15/2 transition) spectral regions depends on the sample temperature and concentration of dopant ions, as well as on the additional structural defects (anion vacancies) created in the crystal lattice by the introduction of Zn^2+ ions or irradiation with high-energy (10 MeV) electrons. The luminescence efficiency and spectrum of the upconversion phosphor are determined by energy transfer processes.

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LI Yang-yang, 李洋洋, 李. 鑫. LI Xin, 周. 昊. ZHOU Hao, 周卓林 ZHOU Zhuo-lin, and 付翠翠 FU Cui-cui. "Synthesis and Upconversion Luminescence Properties of White Phosphor CaF2∶Yb3+/Eu3+/La3+." Chinese Journal of Luminescence 41, no. 2 (2020): 153–59. http://dx.doi.org/10.3788/fgxb20204102.0153.

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