LUMINESCENCE MECHANISM STUDY OF A POTENTIAL SCINTILLATION CRYSTAL YBa3B9O18
LUMINESCENCE MECHANISM STUDY OF A POTENTIAL SCINTILLATION CRYSTAL YBa3B9O18
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DOI：
10.1142/s0217979211058857
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发表时间：
2011-05
影响因子：
1.7
通讯作者：
M. He;Zhihua Zhang;Xiaolong Chen;M. Qiu;Y. Ji;J. Xiu
中科院分区：
文献类型：
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作者：
M. He;Zhihua Zhang;Xiaolong Chen;M. Qiu;Y. Ji;J. Xiu
用实验方法研究了势闪烁晶体YBa3B9O18的发光机理。作为第一步，从光吸收光谱和真空紫外激发发光光谱中估计出光学带隙能量Eg为7.3 eV。在价区测量的x射线光电子能谱与第一原理能带计算相吻合。通过对YBa3B9O18的价带结构和真空紫外激发发光光谱的分析，研究了YBa3B9O18发射带的来源。YBa3B9O18的本征发光归因于自俘获激子的辐射衰变。对其发光机理的阐明，提供了一幅性质-结构关系的物理图景，有助于加快势闪烁晶体的应用。
The luminescence mechanisms of a potential scintillation crystal YBa3B9O18 were investigated by experimental methods. As a first step, the optical band gap energy Eg was estimated to be 7.3 eV from the optical absorption spectrum and vacuum ultraviolet excited luminescence spectra. The X-ray photoelectron spectroscopy measured in the valence region coincided with the first principle energy band calculation. Based on the analysis of valence band structure and vacuum ultraviolet excited luminescence spectra the origins of emission bands of YBa3B9O18 were studied. The intrinsic luminescence of YBa3B9O18 was attributed to the radiative decay of self-trapped excitons. The elucidation of the luminescence mechanism provides a physical picture on the property-structure correlation and may help to accelerate the applications of the potential scintillation crystal.