Journal
MATERIALS RESEARCH BULLETIN
Volume 47, Issue 6, Pages 1428-1431Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.materresbull.2012.02.050
Keywords
Optical materials; Chemical synthesis; Optical properties
Categories
Funding
- National Research Foundation of Korea (NRF)
- Ministry of Education, Science and Technology [2011-50210]
- Seoul RBD Program [WR090671]
- Fundamental R&D Program for Core Technology of Materials [M2009010025]
- Ministry of Knowledge Economy (MKE), Republic of Korea
- Korea Evaluation Institute of Industrial Technology (KEIT) [K0006060] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Green light-emitting Lu2.985Al5O12:Ce-0.015(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 degrees C is Lu2O3 and the other components are amorphous. Phase pure cubic garnet LuAG:Ce phosphor powders are obtained by post-treatment at 1000 degrees C. Phosphor powders post-treated at temperatures below 1400 degrees C retain the spherical shape of the precursor powders. The mean crystallite sizes of phosphor powders post-treated at 1200, 1400, and 1500 degrees 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 degrees C is 84.2% of that of the powders post-treated at 1500 degrees C. (C) 2012 Elsevier Ltd. All rights reserved.
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