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Proceedings Paper

Development of blue excitable persistent phosphor of Ce3+-doped garnet ceramics by bandgap engineering and metal-sensitization
Author(s): Jumpei Ueda; Keisuke Kuroishi; Setsuhisa Tanabe
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Paper Abstract

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 5d1 excited 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.

Paper Details

Date Published: 8 March 2014
PDF: 7 pages
Proc. SPIE 8987, Oxide-based Materials and Devices V, 89870L (8 March 2014); doi: 10.1117/12.2042654
Show Author Affiliations
Jumpei Ueda, Kyoto Univ. (Japan)
Keisuke Kuroishi, Kyoto Univ. (Japan)
Setsuhisa Tanabe, Kyoto Univ. (Japan)

Published in SPIE Proceedings Vol. 8987:
Oxide-based Materials and Devices V
Ferechteh H. Teherani; David C. Look; David J. Rogers, Editor(s)

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