https://scholars.lib.ntu.edu.tw/handle/123456789/407444
標題: | Luminescence characteristics of sol-gel derived y 3 Al 5 O 12 :Eu 3+ phosphors excited with vacuum ultraviolet | 作者: | Lu C.-H. Hsu W.-T. Cheng B.-M. |
公開日期: | 2006 | 卷: | 100 | 期: | 6 | 來源出版物: | Journal of Applied Physics | 摘要: | The luminescence characteristics of europium-ion activated Y 3 Al 5 O 12 (YAG:Eu 3+ ) phosphors prepared via a sol-gel process were investigated in the vacuum ultraviolet (VUV) region using synchrotron radiation. An intense red emission due to 5 D 0 -¡÷ 7 F 1 transition of Eu 3+ ions is produced under excitation at 147 nm. The intensity of this emission significantly increases with calcination temperature and activator concentration. Deconvolution of the VUV excitation spectra reveals the presence of several peaks that can be accordingly assigned to the charge transfer band, exciton transition bands, and 4f 6 ¡÷4f 5 -5d transition band. The excitation spectra of YAG:Eu 3+ phosphors vary markedly with the phosphor particle size. With a decrease in the particle size, the peak positions of the charge transfer band and exciton transition bands shift towards low energy region, and the f¡÷d transition band of Eu 3+ ions shift towards the high energy region. The results imply that the excitation behavior of the sol-gel derived YAG:Eu 3+ phosphors can be tailored by controlling the calcination temperature and the particle size. ? 2006 American Institute of Physics. |
URI: | https://scholars.lib.ntu.edu.tw/handle/123456789/407444 | ISSN: | 00218979 | DOI: | 10.1063/1.2338603 |
顯示於: | 化學工程學系 |
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