Green light-emitting Lu<sub>3sub>Al<sub>5sub>O<sub>12sub>:Ce phosphor powders prepared by spray pyrolysis
- 作者：Hyung Tae Kim ; Jung Hyun Kim ; Jung-Kul Lee<sup> ; sup><sup>jkrhee@konkuk.ac.krsup> ; Yun Chan Kang<sup> ; sup><sup>yckang@konkuk.ac.krsup>
- 关键词：A. Optical materials ; B. Chemical synthesis ; D. Optical properties
- 刊名：Materials Research Bulletin
- 出版年：2012
- 期刊代码：60_00255408
- 类别：ms
- 出版时间：June, 2012
- 卷：47
- 期：6
- 页码：1428-1431
- 文件大小：909 K
摘要
Green light-emitting Lu<sub>2.985sub>Al<sub>5sub>O<sub>12sub>:Ce<sub>0.015sub> (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 掳C is Lu<sub>2sub>O<sub>3sub> and the other components are amorphous. Phase pure cubic garnet LuAG:Ce phosphor powders are obtained by post-treatment at 1000 掳C. Phosphor powders post-treated at temperatures below 1400 掳C retain the spherical shape of the precursor powders. The mean crystallite sizes of phosphor powders post-treated at 1200, 1400, and 1500 掳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 掳C is 84.2%of that of the powders post-treated at 1500 掳C.