温度梯度法生长的Ce: YAlOZr3高温闪烁晶体的光谱分析

采用温度梯度法生长了熔体掺杂Ce浓度为1at%的YAlO3晶体，对于其吸收光谱、荧光光谱和x射线激发发射谱进行了表征分析.根据吸收光谱提出了一个色心模型，从而成功的解释了为什么刚生长出的晶体为粉红色，而分别经氢气和空气在1400℃退火后均能变为无色的现象和退火以后吸收光谱发生的显著变化.温度梯度法生长的Ce:YAP在330nm处存在着一定程度的自吸收和自激发.光致激发发射谱的发射主峰在368nm，而x射线激发发射谱的主发射峰红移至391nm，这表明在x射线激发下，晶体对发射光的自吸收将会减少.另外在x射线 关键词： 温度梯度法 Ce: YAP 色心 光谱

Spectra analysis of Ce:YAlOZr3 single crystals grown by temperature gradient technique

YAlO3 single crystal doped with Ce3+ at concentration 1at% was grown by the temperature gradient technique (TGT). The as rown crystal was pink. After H2 annealing or O2 annealing at 1400℃, the crystal turned into colorless. At the same time, the absorption spectra showed obvious changes. A colorcenters model could successfully explain the experimental phenomena. There are selfabsorption and selfexcitation around 330 nm according to the absorption spectrum and luminescence spectra excited by ultraviolet ray. The emission peak of luminescence spectra under ultraviolet ray excitation is around 368 nm and the emission peak of luminescence spectra under x-ray excitation is around 391nm. These results suggest that the self-absorption can be decreased under x-ray excitation. In addition, the emission intensity of the crystals annealed in H2 or air is higher than that of the as-grown crystal sample.