摘要
铈激活钇铝石榴石 (Ce3 + ∶YAG)单晶是综合性能优良的快衰减闪烁材料。本文以普通光源、激光、同步辐射以及阴极射线为激发源 ,对我们生长的Ce3 + ∶YAG闪烁晶体的激发和发光特性进行了系统的研究。结果表明 :Ce3 + ∶YAG单晶的激发光谱 (监测荧光波长为 5 4 5nm)由五个激发峰组成。不同激发条件下的发射光谱均能用双高斯峰进行较好的拟合 ,拟合后得到的Ce3 + 的 5d→2 F5/2 和 5d→2 F7/2 发光带的中心波长分别约为 5 2 0nm和 5 70nm。但是 ,不同条件激发下 5d→2 F5/2 和 5d→2 F7/2 发光带的强度比有较大差异 ,这可能与不同的激发机制和激发能传输途径有关。
Yttrium aluminium garnet single crystal activated by cerium (Ce 3+ ∶YAG) is a fast scintillator with excellent mechanical and chemical resistance. In this paper, excitation and luminescence properties of Ce 3+ ∶YAG single crystal were systematically studied using visible, ultraviolet, vacuum ultraviolet light, laser and cathode-ray as excitation sources. The results show that the excitation spectra of Ce 3+ ∶YAG single crystal monitored at 545nm emission consist of five peaks. All luminescence spectra can be fitted by two Gaussian functions corresponding to luminescence transitions from the lowest 5 d state to 2 F _ 5/2 and 2 F _ 7/2 manifolds of 4 f state respectively. The fitted results indicate that the center of 5 d → 2 F _ 5/2 and 5 d → 2 F _ 7/2 luminescence transition is at 520nm and 570nm respectively, but the ratios of their intensity are completely different each other, which is ascribed to different excitation mechanism and excitation energy transferring process.
出处
《人工晶体学报》
EI
CAS
CSCD
北大核心
2003年第4期295-299,共5页
Journal of Synthetic Crystals
基金
国家自然科学基金资助项目 (5 983 2 0 80 )
