Long afterglow green luminescence of Tb3+ ion in Ga4GeO8 through persistent energy transfer from host to Tb3+
Long afterglow green luminescence of Tb3+ ion in Ga4GeO8 through persistent energy transfer from host to Tb3+
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DOI：
10.1016/j.jlumin.2021.118149
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发表时间：
2021-05
影响因子：
3.6
通讯作者：
Xiao-yan Fu;Yanan Liu;Y. Meng;Hongwu Zhang
中科院分区：
文献类型：
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作者：
Xiao-yan Fu;Yanan Liu;Y. Meng;Hongwu Zhang
本文采用高温固相法成功合成了一种新型长余辉绿色发光材料Ga4GeO8:Tb3+。 Ga4GeO8 显示出长余辉蓝色发射，峰值位于 490 nm。当Tb3+离子引入主体时，Tb3+的f-f跃迁产生强烈的长余辉绿色发射，主体的蓝色余辉发射完全消失。此外，获得的结果表明主体的余辉发射与 300-500 nm 范围内的 Tb3+ 典型激发波长重叠，表明从主体到 Tb3+ 离子的持续能量转移。在490和550 nm处监测到的热释光曲线分别属于主体和Tb3+的余辉发射，其由TA（303 K）和TB（350 K）两个峰组成，分别对应于浅陷阱和深陷阱，陷阱深度估计为0.606和0.732 eV。这进一步证实了从主体到Tb3+离子的持续能量转移是Ga4GeO8:Tb3+优异的长余辉绿色发光的原因。因此，主体到发光中心的高效持续能量转移可以被视为实现更多颜色的新型长余辉发光材料的有效策略。
In this paper, a novel long afterglow green luminescent material of Ga4GeO8: Tb3+has been successfully synthesized by high-temperature solid-state method. Ga4GeO8showed long afterglow blue emission peaked at 490 nm. When Tb3+ions were introduced into the host, the strong long afterglow green emission from the f-f transition of Tb3+appeared and the blue afterglow emission of the host disappeared completely. Furthermore, the obtained results have shown that the afterglow emission of the host overlapped with typical excitation wavelengths of Tb3+in the range 300–500 nm, indicating of persistent energy transfer from the host to Tb3+ions. The thermoluminescence curves monitored at 490 and 550 nm belonged to the afterglow emissions of host and Tb3+respectively were similar, which consisted of two peaks at TA(303 K) and TB(350 K) corresponded to the shallow trap and the deep trap and the trap depths were estimated to be 0.606 and 0.732 eV. This further confirmed that the persistent energy transfer form host to Tb3+ions was responsible for the excellent long afterglow green luminescence of Ga4GeO8: Tb3+. Thus, the efficient persistent energy transfer of host to emitting center can be regarded as an effective strategy to realize more colors novel long afterglow luminescent materials.