Long persistent and photostimulated luminescence properties of Sr₂Al₂SiO₇:Eu²⁺/Tm³⁺ phosphors

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• 作者：Ye QI ((齐 野))^a ; ^b ; Jinsu ZHANG ((张金苏))^a ; ^{zhangjinsu@gmail.com" class="auth_mail" title="E-mail the corresponding author} ; Hongquan YU ((于洪全))^b ; ^{yuhq7808@djtu.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Jiashi SUN ((孙佳石))^a ; Xiangping LI ((李香萍))^a ; Lihong CHENG ((程丽红))^a ; Baojiu CHEN ((陈宝玖))^a
• 关键词：Sr2Al2SiO7 ; Eu2+/Tm3+ ; long persistent ; photostimulated luminescence ; rare earths
• 刊名：Journal of Rare Earths
• 出版年：2016
• 出版时间：January 2016
• 年：2016
• 卷：34
• 期：1
• 页码：1-6
• 全文大小：840 K

文摘

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. Sr₂Al₂SiO₇: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.