A_3M_2Ge_3O_(12)石榴石体系中Cr^(3+)离子的宽带发射光谱  

Spectral Properties of Broad Emission Bands of Cr 3+ in A 3M 2Ge 3O 12 (A=Cd 2+ ,Ca 2+ ;M=Al 3+ ,Ga 3+ ,Sc 3+ )Garnets

作　　者：刘行仁[1,2,3] 张晓 黄立辉[1,2,3] 袁剑辉 

机构地区：[1]中国科学院激发态物理开放研究实验室 [2]中国科学院长春物理研究所 [3]陕西咸阳彩虹集团公司彩虹荧光粉厂

出　　处：《光谱学与光谱分析》1999年第4期550-552,共3页Spectroscopy and Spectral Analysis

基　　金：国家自然科学基金

摘　　要：首次报告在Ａ３Ｍ２Ｇｅ３Ｏ１２∶Ｃｒ（Ａ＝Ｃｄ２＋，Ｃａ２＋；Ｍ＝Ａｌ３＋，Ｇａ３＋，Ｓｃ３＋）锗酸盐石榴石体系中，Ｃｒ３＋离子室温下的红—近红外（Ｒ—ＮＩＲ）宽发射带光谱性质。随位于八面体格位上的Ａｌ３＋→Ｇａ３＋→Ｓｃ３＋和十二面体格位上的Ｃｄ２＋→Ｃａ２＋组成顺序变化，室温下，Ｃｒ３＋离子的４Ｔ２→４Ａ２能级跃迁的Ｒ－ＮＩＲ宽发射带，发射峰及光谱的长波和短波边逐渐向低能长波边移动。这是由于晶场强度减弱，阳离子的离子半径增大的结果。在镉（钙）铝和镉（钙）镓锗酸盐体系中，少量Ｓｃ３＋取代八面体上的Ａｌ３＋和Ｇａ３＋时，可使Ｃｒ３＋的Ｒ－ＮＩＲ荧光发射强度增强。The spectral properties of the Cr 3+ broad emission band in A 3M 2 Ge 3O 12 ∶Cr (A= Cd 2+ ,Ca 2+ ;M= Al 3+ ,Ga 3+ ,Sc 3+ ) germanate garnets at room temperature are reported for the first time.In the order of Al 3+ →Ga 3+ →Sc 3+ and Cd 2+ →Ca 2+ ions which occupy the octahedral and duodeahedral sites,respectively,R-NIR broad emission band of 4T 2→ 4A 2 level transition,emission peak,and the spectral long wavelength and short wavelength sides of Cr 3+ shift to long wavelengths having lower energy.The reason is that the crystal field strengths in the octahedral decrease,while the cation ionic radii in the A 3M 2 Ge 3O 12 system garnets increase gradually.The R NIR emission intensity of Cr 3+ is increased with some Sc 3+ ions substitution for Al 3+ or Ga 3+ ions in octahedral sites.

关 键 词：铬离子 激光材料 发射光谱 锗酸盐 石榴石 

分 类 号：TN244[电子电信—物理电子学]