Super‐Long Persistent Luminescence in the Ultraviolet A Region from a Bi3+‐Doped LiYGeO4 Phosphor

Here, a novel super‐long, ultraviolet A region (UVA), persistent luminescent (PerL) material, LiYGeO4:Bi3+, is developed. After irradiation at 254 nm for 10 min, the UVA PerL of LiYGeO4:Bi3+ can persist for more than 300 h. In addition, the LiYGeO4:Bi3+ also possesses a strong UVA emission with a po...

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Bibliographic Details
Published in:Advanced optical materials 2019-10, Vol.7 (19), p.n/a
Main Authors: Shi, Junpeng, Sun, Xia, Zheng, Shenghui, Fu, Xiaoyan, Yang, Yi, Wang, Jiani, Zhang, Hongwu
Format: Article
Language:English
Subjects:
Biomedical materials
Bismuth
Emission
Excitation
Irradiation
Light emitting diodes
Materials science
Optics
Perl
persistent luminescence
Phosphors
Photoluminescence
photostimulation
Thermoluminescence
ultraviolet emission
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Summary:Here, a novel super‐long, ultraviolet A region (UVA), persistent luminescent (PerL) material, LiYGeO4:Bi3+, is developed. After irradiation at 254 nm for 10 min, the UVA PerL of LiYGeO4:Bi3+ can persist for more than 300 h. In addition, the LiYGeO4:Bi3+ also possesses a strong UVA emission with a power density of 11.83 mW m−2 at 10 s after the removal of the excitation source. Even after 72 h, the UVA PerL emission spectrum can still be clearly detected, which is the same as the photoluminescence emission spectrum and originated from the Bi3+ emitting centers. Furthermore, LiYGeO4:Bi3+ also exhibits a photostimulated PerL property, which can be easily activated with a red light emitting diode (LED) or NIR laser irradiation after the long‐term decay. Combining the results of the PerL excitation, absorption, and thermoluminescence spectra, the excellent UVA PerL of LiYGeO4:Bi3+ can be ascribed to the existence of abundant trap sites created by the loss of Li+. This excellent PerL material can make up for deficiency of PerL materials in the UVA region and greatly expand the application of PerL materials in the biomedical, energy, environmental, and catalysis fields. A novel super‐long ultraviolet A region (UVA) persistent luminescent (PerL) material, LiYGeO4:Bi3+, is developed, which exhibits a strong UVA PerL peaking at 350 nm and possesses a super‐long UVA PerL time of more than 300 h. Furthermore, LiYGeO4:Bi3+ simultaneously exhibits an excellent photostimulated UVA PerL capability after a short‐term illumination with red or near‐infrared light.
ISSN:2195-1071
2195-1071
DOI:10.1002/adom.201900526