Spectral properties and thermoluminescence of PbWO₄ crystals annealed in different atmospheres

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• 作者：Shi ; Chaoshu ; Wei ; Yaguang ; Yang ; Xiaoyu ; Zhou ; Dongfang ; Guo ; Changxin ; Liao ; Jingying ; Tang ; Honggao
• 刊名：Chemical Physics Letters
• 出版年：2000
• 期刊代码：7_00092614
• 类别：ph
• 出版时间：September 22, 2000
• 卷：328
• 期：1-2
• 页码：1-4
• 文件大小：132 K

摘要

Photoluminescence (PL) and their excitation spectra, cathodoluminescence (CL) and thermoluminescence (TL) of PbWO₄ crystals annealed in oxygen, air and vacuum have been investigated. The results indicate that the green luminescence is not caused by (WO₃+F) centers but is probably related to (WO₄+O_i). Assignment of the excitation states is also discussed. Some structural defects related to the oxygen vacancy (V₀) are the main mechanism inducing the fluorescence excitation band peaking at 378 nm and forming shallow traps corresponding to a TL peak at 134 K. The deeper traps shown by thermoluminescence at ca. 250 K originate from local oxygen excess defects.