温度梯度法生长的Ce:YAlO_3高温闪烁晶体的光谱分析  

Spectra analysis of Ce: YAlO_3 single crystals grown by temperature gradient technique

作　　者：曾雄辉[1] 赵广军[1] 徐军[1] 

机构地区：[1]中国科学院上海光学精密机械研究所,上海201800

出　　处：《物理学报》2004年第6期1935-1939,共5页Acta Physica Sinica

摘　　要：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 1 4 0 0℃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 36 8nm ,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射线激发发射谱上 ,经H2YAlO 3 single crystal doped with Ce 3+ at concentration 1at% was grown by the temperature gradient technique (TGT). The as grown crystal was pink. After H 2 annealing or O 2 annealing at 1400℃, the crystal turned into colorless. At the same time, the absorption spectra showed obvious changes. A color centers model could successfully explain the experimental phenomena. There are self absorption and self excitation 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 H 2 or air is higher than that of the as grown crystal sample.

关 键 词：温度梯度法 铝酸钇晶体 铈掺杂 色心晶体 光谱分析 

分 类 号：O782[理学—晶体学]