Effect of RE³⁺ electronegativities on luminescence property of Ba₅Si₈O₂₁:Eu²⁺ persistent phosphor

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• 作者：Zhiliang DONG ((董志良))^a ; Yi QIN ((秦 艺))^a ; Yong YANG ((杨 勇))^a ; ^b ; Dacheng ZHOU ((周大))^a ; ^b ; Xuhui XU ((徐旭辉))^a ; ^b ; Jianbei QIU ((邱建备))^a ; ^{qiu@kmust.edu.cn" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Ba5Si8O21 ; persistent phosphor ; electronegativity ; luminescence ; rare earths
• 刊名：Journal of Rare Earths
• 出版年：2016
• 出版时间：May 2016
• 年：2016
• 卷：34
• 期：5
• 页码：453-457
• 全文大小：818 K

文摘

A series of Ba₅Si₈O₂₁:0.02Eu²⁺,0.09RE³⁺ persistent phosphors were synthesized by the solid-state reaction method. The measurement results of photoluminescence (PL), phosphorescence and thermoluminescence (TL) were analysed and discussed. The XRD results showed that samples codoped with different RE³⁺ were Ba₅Si₈O₂₁ single pure phase. Under the excitation, all samples exhibited a broad Eu²⁺ characteristic emission, and the La³⁺ co-doped sample emitted the brightest photoluminescence even though its persistent luminescence property was the worst because of the weakest electronegativity. However, Nd³⁺ electronegativity was suitable, thus after activation, the Ba₅Si₈O₂₁:Eu²⁺,Nd³⁺ sample had the best persistent luminescence performance with the highest phosphorescence intensity and the persistent luminescence decay time beyond 8 h. The Nd³⁺ co-doped sample also had the largest thermoluminescence integral area which proved effectively it had longer persistent luminescence time. The luminescence mechanism was also proposed to study the photoluminescence and persistent luminescence process. These results showed that RE³⁺ electronegativities were distinctly important for persistent phosphors and choosing suitable electronegativity codopant was conducive to enhancing the phosphorescent performance.