Green light-emitting Lu3Al5O12:Ce phosphor powders prepared by spray pyrolysis |
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| Authors: | Hyung Tae Kim Jung Hyun Kim Jung-Kul Lee Yun Chan Kang |
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| Affiliation: | 1. School of Physics and Optoelectronic Engineering, Guangdong University of Technology, Guangzhou, 510006, PR China;2. Experimental Teaching Department, Guangdong University of Technology, WaiHuan Xi Road, No. 100, Guangzhou, 510006, PR China;1. Charles University, Faculty of Mathematics and Physics, Ke Karlovu 5, 12116 Prague, Czech Republic;2. Institute of Physics ASCR, Cukrovarnicka 10, 16253 Prague, Czech Republic;3. Faculty of Nuclear Sciences and Physical Engineering, Czech Technical University in Prague, Brehova 7, 11519 Prague, Czech Republic;1. Faculty of Nuclear Sciences and Physical Engineering, Czech Technical University in Prague, Brehova 7, 11519 Praha 1, Czech Republic;2. Institute of Physics, Academy of Sciences of the Czech Republic, Na Slovance 1999/2, 18221 Praha 8, Czech Republic;1. Department of LED Convergence Engineering, Pukyong National University, Busan 608-739, Republic of Korea;2. Busan Il Science Highschool, Busan 604-828, Republic of Korea;1. Kaneka Fundamental Technology Research Alliance Laboratories, Kaneka Corporation, 2-8 Yamadaoka, Suita, Osaka, 565-0871, Japan;2. Joining and Welding Research Institute, Osaka University, 11-1 Mihogaoka, Ibaraki, Osaka, 567-0047, Japan;1. Center of Exact and Technological Science, Federal University of Recôncavo of Bahia, Cruz das Almas, BA 44380-000, Brazil;2. Department of Physics, Federal University of Sergipe, São Cristóvão, SE 49100-000, Brazil;3. Center for Optical Materials Science and Engineering Technologies, Clemson University, Anderson, SC 29625, USA;4. Department of Materials Science and Engineering, Clemson University, Clemson, SC 29634, USA |
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| Abstract: | Green light-emitting Lu2.985Al5O12:Ce0.015 (LuAG:Ce) phosphor powders are prepared by spray pyrolysis. The only crystallized phase in the precursor powders and post-treated powders at temperatures below 800 °C is Lu2O3 and the other components are amorphous. Phase pure cubic garnet LuAG:Ce phosphor powders are obtained by post-treatment at 1000 °C. Phosphor powders post-treated at temperatures below 1400 °C retain the spherical shape of the precursor powders. The mean crystallite sizes of phosphor powders post-treated at 1200, 1400, and 1500 °C are 30, 46, and 54 nm, respectively. The excitation spectra contain two bands: a weak band with the maximum peak at 345 nm and a strong broad band in the spectral range from 400 to 490 nm with the maximum peak at 455 nm. The LuAG:Ce phosphor powders have broad emission spectra between 480 and 600 nm, with the maximum peak intensity located at 507 nm. The photoluminescence intensity of the phosphor powders post-treated at 1400 °C is 84.2% of that of the powders post-treated at 1500 °C. |
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