Long persistent and photostimulated luminescence properties of Sr2Al2SiO7:Eu2+/Tm（3+） phosphors
来源期刊：Journal of Rare Earths2016年第1期
论文作者：齐野 张金苏 于洪全 孙佳石 李香萍 程丽红 陈宝玖
文章页码：1 - 6
摘 要：A series of Sr2Al2SiO7 phosphors with fixed Eu2+ concentration and various Tm3+ concentrations were synthesized via a high temperature solid state reaction. The structure and luminescence properties of the samples were characterized by X-ray powder diffraction（XRD）, photoluminescence（PL） spectra, decay curves, thermoluminescence（TL） glow curves as well as the photostimulated luminescence（PSL） spectra. Sr2Al2 Si O7:Eu2+,Tm3+ phosphors exhibited strong green phosphorescence and photostimulated luminescence originating from 4f65d1–4f7 transition of Eu2+ after ultraviolet light stimulation. Deep traps were found by analyses on the phosphorescence decays and thermoluminescence spectra. It was also found that with increasing the time interval between UV excitation turn-off and stimulation turn-on, the photostimulated luminescence became stronger. This phenomenon resulted from the fact that the captured electron was retrapped by the deep traps. Compared with the Tm3+-free sample, it was found that the PSL intensity was strongly enhanced in Tm3+ codoping samples.
齐野1,2，张金苏1，于洪全2，孙佳石1，李香萍1，程丽红1，陈宝玖1
1. Department of Physics, Dalian Maritime University2. College of Environmental and Chemical Engineering, Dalian Jiaotong University
摘 要：A series of Sr2Al2SiO7 phosphors with fixed Eu2+ concentration and various Tm3+ concentrations were synthesized via a high temperature solid state reaction. The structure and luminescence properties of the samples were characterized by X-ray powder diffraction（XRD）, photoluminescence（PL） spectra, decay curves, thermoluminescence（TL） glow curves as well as the photostimulated luminescence（PSL） spectra. Sr2Al2 Si O7:Eu2+,Tm3+ phosphors exhibited strong green phosphorescence and photostimulated luminescence originating from 4f65d1–4f7 transition of Eu2+ after ultraviolet light stimulation. Deep traps were found by analyses on the phosphorescence decays and thermoluminescence spectra. It was also found that with increasing the time interval between UV excitation turn-off and stimulation turn-on, the photostimulated luminescence became stronger. This phenomenon resulted from the fact that the captured electron was retrapped by the deep traps. Compared with the Tm3+-free sample, it was found that the PSL intensity was strongly enhanced in Tm3+ codoping samples.
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