標題: | Electron paramagnetic resonance and luminescence study of sol-gel derived YAG : Cr powder |
作者: | Lo, JR Ezhilvalavan, S Tseng, TY 電子工程學系及電子研究所 Department of Electronics Engineering and Institute of Electronics |
關鍵字: | YAG : Cr phosphors;sol-gel;EPR;luminescence |
公開日期: | 1-三月-1999 |
摘要: | Electron paramagnetic resonance (EPR) and luminescence studies were carried out for the sol-gel-derived YAG:Cr powders subjected to three kinds of heat treatment processes. The results show that powders processed using the two-step heat treatment process with the addition of 20 wt% LiCl and by direct heat treatment at 1500 degrees C exhibit good luminescence properties. The emission spectrum for the powders obtained by the two-step process shows the R-line at 688 nm, whereas the powders directly heat treated at 1500 degrees C display an additional R-line of Al2O3 : Cr at 694 nm: EPR measurements show that the presence or absence of absorption peaks depends on the Cr3+ environment in-the host lattice resulting from the different methods of heat treatment of the powder. The EPR spectra of YAG:Cr3+ phosphors were interpreted to indicate both Cr3+ single ion and Cr3+-Cr3+ pair (with spin three) transitions. |
URI: | http://dx.doi.org/10.1143/JJAP.38.1390 http://hdl.handle.net/11536/31500 |
ISSN: | 0021-4922 |
DOI: | 10.1143/JJAP.38.1390 |
期刊: | JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS |
Volume: | 38 |
Issue: | 3A |
起始頁: | 1390 |
結束頁: | 1393 |
顯示於類別: | 期刊論文 |