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F, Y双掺钨酸铅晶体的发光性能和微观缺陷

叶崇志 廖晶莹 杨培志 谢建军 罗 澜 曹顿华

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F, Y双掺钨酸铅晶体的发光性能和微观缺陷

叶崇志, 廖晶莹, 杨培志, 谢建军, 罗 澜, 曹顿华

The luminescence and defects of F, Y co-doped PbWO4 crystals

Ye Chong-Zhi, Liao Jing-Ying, Yang Pei-Zhi, Xie Jian-Jun, Luo Lan, Cao Dun-Hua
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  • 通过透射光谱、光产额(LY)和光致发光等发光性能测试,研究了F,Y双掺钨酸铅(PbWO4 ,简称PWO)晶体的发光性能,并利用热释光曲线和正电子湮没寿命谱对F,Y双掺PWO晶 体中的缺陷种类和变化进行了分析. 结果表明:与未掺杂晶体相比,双掺样品在350nm附近 的透过率大大提高,吸收边向短波方向移动约30nm,光致发光谱中出现位于350nm的发光峰 ,双掺样品的LY(100ns内)为未掺杂PWO的2.7倍左右.晶体中主要存在的缺陷为(WO3)-
    The influence of F,Y co-doping on the luminescence properties and defects of PbW O4 (PWO) have been investigated by correlated measurements of transmi ssion spectra, light yield, photoluminescence spectra, thermoluminescence and po sitron annihilation lifetime. F doping results in a new luminescence band peaked around 350nm, which gives a significant improvement in luminescence properties of PWO. Meanwhile, Y-dopant efficiently reduces trapping state and accelerates t he scintillation decay process. Compared with the undoped PWO samples, the light yield (100ns) of F,Y co-doped PWO crystal was increased by a factor of 2.7. Th e main defects (WO3)- and (WO4)3- in PWO crystals for lack of oxygen during growth were investigated. Thermoluminesc ence results show that the defects in PWO crystals increase when annealed in vac uum and these defects can be also suppressed by annealing in air at 600℃.
    • 基金项目: 国家自然科学基金(批准号:50572111)资助的课题.
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  • 文章访问数:  7812
  • PDF下载量:  1450
  • 被引次数: 0
出版历程
  • 收稿日期:  2004-11-26
  • 修回日期:  2005-12-12
  • 刊出日期:  2006-02-05

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