Abstract A novel white long persistent phosphor of Y 3 Al 2 Ga 3 O 12: Tb 3+ was prepared by the soft chemical method. Y 3 Al 2 Ga 3 O 12: Tb 3+ presented a white long persistent luminescence when the doping concentration of Tb 3+ was just 0.1% and the afterglow time was able to last more than 2 h. The persistent emission of Tb 3+ in Y 3 Al 2 Ga 3 O 12 consisted of all color emissions in the visible spectrum from an identical luminescent center (Tb 3+ ); meanwhile, the white-light color won't vary as the afterglow time goes on. The mystery behind this phenomenon was studied deeply including trap depths, distribution and types. The trap depths was calculated from 0.65 to 1.15 eV by the initial rise method analysis, highly corresponding to the ideal energy for trapping and releasing at room temperature. What's more, the estimated trap structure was proved to be a continuous trap distribution by varying the thermal cleaning temperature. The persistent luminescence mechanism of Y 3 Al 2 Ga 3 O 12: Tb 3+ was illustrated and discussed in detail on the basis of the experimental results. This work provides a promising approach for the development of white long persistent phosphor.

中文翻译：

---

Tb 3+ 掺杂Y 3 Al 2 Ga 3 O 12 荧光粉的白光长余辉发光

摘要 采用软化学法制备了一种新型Y 3 Al 2 Ga 3 O 12: Tb 3+ 白色长余辉荧光粉。Y 3 Al 2 Ga 3 O 12: Tb 3+ 在Tb 3+ 的掺杂浓度仅为0.1%，余辉时间能够持续2 h以上时，呈现白色长余辉发光。Y 3 Al 2 Ga 3 O 12 中Tb 3+ 的持续发射由来自同一发光中心（Tb 3+ ）的可见光谱中的所有颜色发射组成；同时，白光颜色不会随着余辉时间的推移而变化。对这一现象背后的奥秘进行了深入研究，包括圈闭深度、分布和类型。通过初始上升法分析计算出的陷阱深度为 0.65 至 1.15 eV，高度对应于室温下俘获和释放的理想能量。更重要的是，通过改变热清洁温度，估计的陷阱结构被证明是连续的陷阱分布。在实验结果的基础上，对Y 3 Al 2 Ga 3 O 12: Tb 3+ 的持续发光机理进行了详细说明和讨论。这项工作为开发白色长余辉磷光体提供了一种有前景的方法。