Development of blue excitable persistent phosphor of Ce3+-doped garnet ceramics by bandgap engineering and metal sensitization
Development of blue excitable persistent phosphor of Ce3+-doped garnet ceramics by bandgap engineering and metal sensitization
复制标题
利用带隙工程和金属敏化开发Ce3掺杂石榴石陶瓷蓝色可激发持久荧光粉
DOI：
10.1117/12.2042654
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
Setsuhisa Tanabe
中科院分区：
文献类型：
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作者：
Jumpei Ueda;Keisuke Kuroishi;Setsuhisa Tanabe
研究了掺Ce（3+）石榴石陶瓷Y3 Al 5-xGaxO（12）：Ce（3+）（x=0，1，2，3，3.5，4）的蓝色可激发余辉发光特性。在蓝色激发下，x=3和3.5的样品中观察到了持续发光。在这些材料中，Ce ~（3+）的最低5d ~ 1激发能级与导带之间的能隙比x=0，1，2的样品要近得多。结果，在x=3和3.5的样品中，通过蓝色激发通过导带发生到电子陷阱的有效电子转移。在紫外光激发下，所有样品都出现了热释光（TL），并且随着Ga含量的增加，TL峰向低能方向移动。随着Ga含量的增加，导带降低，导致光电离阈值能量和电子陷阱深度降低。因此，我们证明了持续发光性能，如存储波长和持续衰减曲线，通过改变Ga含量控制。我们还发现，金属离子的共掺杂提高了样品的持续发光强度和持续时间。
We investigated the blue excitable persistent luminescence properties in the Ce3+-doped garnet ceramics with the composition of Y3Al5-xGaxO12:Ce3+(x=0, 1, 2, 3, 3.5, 4). The persistent luminescence was observed in the sample with x=3 and 3.5 by the blue excitation. In these materials, the energy gap between the lowest 5d1excited level of Ce3+and the conduction band is much closer compared with x=0, 1, 2 samples. As a result, the efficient electron transfer to the electron trap occurs through the conduction band by the blue excitation in the x=3 and 3.5 samples. The thermoluminescence (TL) was observed in all the samples by UV excitation and the TL peaks were shifted to lower energy with increasing Ga content. The decreases of the threshold energy of photoionization and the electron trap depth with increasing Ga content can be caused by lowering conduction band. Therefore, we demonstrated that the persistent luminescence properties, such as storagetable wavelength and persistent decay profile, are controlled by changing Ga content. We also discovered that the persistent luminescence intensity and duration time were improved by co-doping with metal ions.