Luminescence properties of a novel greenish-blue emission long persistent phosphor Sr₃TaAl₃Si₂O₁₄:Pr³⁺

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• 作者：Feihong Xue ; Yihua Hu ; ^{huyh@gdut.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Li Chen ; Guifang Ju ; Tao Wang ; Shaoan Zhang ; Miao He
• 关键词：Luminescence ; Greenish-blue emission ; Long afterglow ; Defects
• 刊名：Ceramics International
• 出版年：2016
• 出版时间：July 2016
• 年：2016
• 卷：42
• 期：9
• 页码：11039-11044
• 全文大小：900 K

文摘

Pr³⁺exhibits prominent red emission in most oxide phosphors, which derives from the ¹D₂→³H₄ transition, and green or blue emission from ³P₀→³H_{4, 5} transitions are normally less intense in most cases. However, a greenish-blue emission was observed from Sr₃TaAl₃Si₂O₁₄:Pr³⁺prepared via solid state reaction. All as-prepared phosphors were studied systematically by X-ray diffraction (XRD), photoluminescence spectra, decay curves, long afterglow (LAG) spectra and thermoluminescence (TL) glow curves. Based on the excitation and emission spectra, the Sr₃TaAl₃Si₂O₁₄ (STAS) host is proved to be a self-activated luminescent host lattice. In the emission spectra for Pr³⁺doped STAS, the predominant greenish-blue emission locating at ~489 nm and ~507 nm coming from ³P_0,1→³H₄ transitions were observed. And the different mechanisms for concentration quenching in both cases were discussed. At last, a model was proposed on the basis of experimental results to discuss the LAG mechanism of STAS:Pr³⁺in detail.