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研究了基质组成对xSrO·yAl2O3?Eu2+,Dy3+体系长余辉发光性能的影响,并对其影响机理进行了探讨。XRD分析和长余辉发光性能表明:改变Al2O3/SrO比率可以获得长余辉发光性能较好的3种基质相:SrAl2O4?Eu2+,Dy3+和Sr4Al14O25?Eu2+,Dy3+及SrAl4O7?Eu2+,Dy3+。激发与发射光谱性能分析和余辉衰减特性分析结果表明:随着基质中Sr/Al比例的减小,激发光谱向短波方向延伸,发射峰蓝移,初始余辉亮度越高,余辉持续时间越长。热释光谱分析表明:贫锶相晶格中的陷阱深度与密度较大,因而显示出较好的长余辉发光性能。
The effect of matrix composition on the long afterglow luminescent properties of xSrO · yAl2O3 · Eu2 +, Dy3 + system was studied, and the influence mechanism was also discussed. The results of XRD analysis and long afterglow luminescence show that the three kinds of matrix phases with long afterglow luminescent properties, SrAl2O4? Eu2 +, Dy3 + and Sr4Al14O25? Eu2 +, Dy3 + and SrAl4O7? Eu2 +, Dy3 + can be obtained by changing the ratio of Al2O3 / SrO. The analysis of excitation and emission spectra and the analysis of afterglow decay characteristic show that the excitation spectrum extends to the shortwave with the ratio of Sr / Al decreasing, and the emission peak is blue-shifted. The higher the initial afterglow brightness, the longer the afterglow duration. The results of thermolysis spectroscopy show that the depth and density of traps in strontium-depleted phase lattice are large, which shows good long-lasting luminescence properties.