V. A. Fedorov, E. V. Antonov, I. D. Venevtsev, V. M. Kanevsky, B. V. Nabatov, E. S. Saltanova
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引用次数: 0
摘要
摘要 分析了掺铈钇铝石榴石晶体在真空中从熔体中生长出来后的发光和闪烁特性。研究了吸收和 X 射线发光光谱、X 射线发光衰减动力学和闪烁特定光产率在较大活化剂浓度范围内（从 0.0036% 到 1.175%，钇在石榴石结构 c 位点的替代率）的变化情况。研究发现，随着活化剂浓度的增加，紫外区基底晶体的反斜长石和空位缺陷的本征发光被有效淬灭。为了提高 Ce3+ 离子的 X 射线发光强度和闪烁光产率，确定了最佳活化剂浓度，同时考虑到了在真空中通过水平定向结晶技术生长出具有高 Ce3+ 浓度的高光学质量单晶的技术特点。分析了 X 射线发光动力学与活化剂浓度的关系。结果表明，可以生长出特定光产率高达 25 000 ph/MeV 的晶体。
Influence of Activator Concentration on the Spectral-Luminescence and Scintillation Properties of YAG:Ce Crystals
The luminescence and scintillation characteristics of cerium-doped yttrium aluminum garnet crystals grown from melts in vacuum have been analyzed. Absorption and X-ray luminescence spectra, X-ray luminescence decay kinetics, and scintillation specific light yield in a wide range of activator concentrations (from 0.0036 to 1.175 at % with respect to substitution for yttrium at the c sites of the garnet structure) have been studied. Effective quenching of the intrinsic luminescence of antisite and vacancy defects of the base crystal in the UV region with an increase in the activator concentration has been found. The optimal activator concentration has been determined in order to increase the X-ray luminescence intensity and the scintillation light yield of Ce3+ ions, with allowance for the technological features of growth of single crystals of high optical quality with a high Ce3+ concentration by the horizontal directional crystallization in vacuum. The dependences of the X-ray luminescence kinetics on the activator concentration have been analyzed. It is shown that crystals with the specific light yield up to 25 000 ph/MeV can be grown.
期刊介绍：
Crystallography Reports is a journal that publishes original articles short communications, and reviews on various aspects of crystallography: diffraction and scattering of X-rays, electrons, and neutrons, determination of crystal structure of inorganic and organic substances, including proteins and other biological substances; UV-VIS and IR spectroscopy; growth, imperfect structure and physical properties of crystals; thin films, liquid crystals, nanomaterials, partially disordered systems, and the methods of studies.
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