ABSTRACT A new type of long persistent green luminescent phosphor Ca2Ga2GeO7: Tb3+ was prepared by high temperature solid-state reaction technique. In this paper, the crystal structure, luminescence properties and decay curves of phosphors were mainly studied. The long persistent luminescence (LPL) properties of these phosphors were characterized by LPL spectra, LPL decay curves and thermoluminescence (TL) spectra. When the ultraviolet (UV) light source was turned off, Ca2Ga2GeO7: Tb3+ phosphor exhibit typical LPL behavior for approximately 1.2 h. The green-emitting LPL was originated form the typical 5D4→7F5 transition of Tb3+ ions, and the green LPL is similar to PL. Based on the experimental results, the LPL mechanism and traps distribution of the Ca2Ga2GeO7: Tb3+ was described via TL analysis in detail.

中文翻译：

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Tb3+掺杂锗酸钙镓的长余辉发光和陷阱分布

摘要 采用高温固相反应技术制备了一种新型长余辉绿色发光荧光粉Ca2Ga2GeO7：Tb3+。本文主要研究了荧光粉的晶体结构、发光特性和衰减曲线。这些荧光粉的长余辉发光 (LPL) 特性由 LPL 光谱、LPL 衰减曲线和热释光 (TL) 光谱表征。当紫外 (UV) 光源关闭时，Ca2Ga2GeO7:Tb3+ 荧光粉表现出典型的 LPL 行为约 1.2 小时。发绿光的LPL起源于Tb3+离子典型的5D4→7F5跃迁，绿色LPL类似于PL。基于实验结果，通过TL分析详细描述了Ca2Ga2GeO7:Tb3+的LPL机制和陷阱分布。