Journal
JOURNAL OF MATERIALS CHEMISTRY C
Volume 10, Issue 45, Pages 17343-17352Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d2tc03646k
Keywords
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Funding
- National Natural Science Foundation of China [51902184]
- Key Research and Development Program of Shandong Province [2021CXGC011101]
- Natural Science Foundation of Shandong Province [ZR2019BEM028]
- Shandong University
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A new type of LiLuSiO4:Pr3+,Sm3+ UVC persistent phosphors has been reported, with significant enhancement of UVC afterglow intensity and decay time achieved by Sm3+ co-doping, along with the realization of NB-UVB persistent luminescence. These persistent phosphors have promising applications as invisible identification taggants in bright environments.
Solar-blind ultraviolet-C (UVC; 200-280 nm) luminescent materials have exhibited great potential for wide applications in photomedicine and photochemistry due to the unique spectral features of UVC light. However, it is still a challenging work to develop persistent phosphors emitting in the UVC spectral region owing to the lack of suitable host materials and emitting centers. Herein, we report a series of LiLuSiO4:Pr3+,Sm3+ UVC persistent phosphors that can be charged by a 254 nm UV lamp or a high-energy X-ray beam giving rise to long-lasting UVC light emission peaking at 280 nm. More importantly, a considerable enhancement of UVC afterglow intensity and decay time has been achieved by Sm3+ co-doping because the Sm3+ ions can act as effective electron traps, which has been verified by the spectroscopic investigations and first-principles calculations. On top of this, narrowband ultraviolet-B (NB-UVB) persistent luminescence with a line emission at 313 nm has also been realized by introducing Gd3+ into LiLuSiO4:Pr3+,Sm3+ persistent phosphors based on persistent energy transfer from Pr3+ to Gd3+. Considering that the UVC and NB-UVB persistent luminescence can fully avoid severe interference from ambient light, the as-prepared LiLuSiO4:Pr3+,Sm3+ and Li(Lu,Gd)SiO4:Pr3+,Sm3+ persistent phosphors can find promising applications as invisible identification taggants in a bright environment.
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