光学学报, 2009, 29 (12): 3463, 网络出版: 2009-12-23
掺铈铝酸钇闪烁晶体自吸收问题研究
Investigation on the Self-Absorption of Ce:YAP Crystals
摘要
研究了掺铈铝酸钇(Ce:YAP)晶体的自吸收机理以提高其光产额等闪烁性能。用提拉法生长了不同掺杂摩尔分数的Ce:YAP闪烁晶体。室温下测试了不同厚度、不同摩尔分数和不同退火条件下Ce:YAP晶体的透过、荧光、X射线激发发射等光谱特征,并对可能存在的自吸收机理进行了分析。结果表明,Ce:YAP晶体的自吸收主要由Ce4+离子与氧离子配体之间的电荷转移吸收引起,根据电荷转移吸收理论可得其吸收峰在303 nm左右,与实验结果基本一致。本实验表明通过一定的退火工艺和掺杂控制减少Ce4+离子,将能有效地使样品的吸收边蓝移,从而减少Ce:YAP晶体的自吸收,提高闪烁性能。
Abstract
The mechanism of self-absorption of Ce:YAP crystals which are grown by Czochralski method is investigated in this paper. Samples with different thickness,concentration and annealing condition are prepared and the corresponding transmittance spectra,photoluminescence and X-ray excited luminescence are measured at room temperature. The mechanism of self-absorption of Ce:YAP crystals is studied and the results show that the self-absorption band peaking at 303 nm is caused by charge transfer transition of Ce4+ ions. The study indicates that the problem of self-absorption can been resolved by effectively minimizing the concentration of Ce4+ions.
曹顿华, 刘永建, 赵广军, 陈建玉, 董勤, 丁雨憧. 掺铈铝酸钇闪烁晶体自吸收问题研究[J]. 光学学报, 2009, 29(12): 3463. Cao Dunhua, Li Yongjian, Zhao Guangjun, Chen Jianyu, Dong Qin, Ding Yuchong. Investigation on the Self-Absorption of Ce:YAP Crystals[J]. Acta Optica Sinica, 2009, 29(12): 3463.