Effect of air annealing on the spectral properties of Ce:Y₃Al₅O₁₂ single crystals grown by the temperature gradient technique

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• 作者：Zeng ; Xionghui ; Zhao ; Guangjun ; Xu ; Jun ; Li ; Hongjun ; He ; Xiaoming ; Pang ; Huiyong ; Jie ; MingYin
• 关键词：87.64.Ni ; 78.55.&minus ; m ; 61.72.Ji ; A1. Color center ; B1. Ce ; B1. YAG ; A2. Temperature gradient technique
• 刊名：Journal of Crystal Growth
• 出版年：2005
• 期刊代码：49_00220248
• 类别：ch
• 出版时间：February 1, 2005
• 卷：274
• 期：3-4
• 页码：495-499
• 文件大小：199 K

摘要

Five absorption bands, at 227, 300, 340, 370 and 457nm, were observed in the optical absorption spectrum of Ce:Y₃Al₅O₁₂ (Ce:YAG) crystals grown by the temperature gradient technique (TGT). The absorption bands at 227, 340, and 457nm were identified as belonging to the Ce³⁺-ion in the YAG crystal. A near UV optical emission band at 398nm was observed, with an excitation spectrum containing two bands, at 235 and 370nm. No fluorescence was detected under 300nm excitation. The pair of absorption bands at 235 and 370nm and the absorption band at 300nm were attributed to the F- and F⁺-type color centers, respectively. The color centers model was also applied to explain the spectral changes in the Ce:YAG (TGT) crystal, including the reduction in the Ce³⁺-ion absorption intensity, after annealing in an oxidizing atmosphere (air).