期刊
SCIENCE CHINA-MATERIALS
卷 65, 期 4, 页码 1103-1111出版社
SCIENCE PRESS
DOI: 10.1007/s40843-021-1790-1
关键词
phosphor; deep ultraviolet; multi-mode luminescence; sterilization
资金
- National Natural Science Foundation of China [51961145101, 51972118]
- International Cooperation Project of National Key Research and Development Program of China [2021YFE0105700]
- Guangzhou Science & Technology Project [202007020005]
- Local Innovative and Research Teams Project of Guangdong Pearl River Talents Program [2017BT01X137]
The study demonstrated a heterovalent substituting strategy to achieve multimode deep-UV emission in a defect-rich host, by beneficially activating defect site reconstruction and regulating different traps. The multi-responsive deep-UV emitter exhibits persistent luminescence and photo-stimulated luminescence, and responds to different convenient light sources, providing insights into developing UV light sources for sterilization applications.
Perusing multimode luminescent materials capable of being activated by diverse excitation sources and realizing multi-responsive emission in a single system remains a challenge. Herein, we utilize a heterovalent substituting strategy to realize multimode deep-ultraviolet (UV) emission in the defect-rich host Li2CaGeO4 (LCGO). Specifically, the Pr3+ substitution in LCGO is beneficial to activating defect site reconstruction including the generation of cation defects and the decrease of oxygen vacancies. Regulation of different traps in LCGO:Pr3+ presents persistent luminescence and photo-stimulated luminescence in a synergetic fashion. Moreover, the up-conversion luminescence appears with the aid of the 4f discrete energy levels of Pr3+ ions, wherein incident visible light is partially converted into germicidal deep-UV radiation. The multi-responsive character enables LCGO:Pr3+ to response to convenient light sources including X-ray tube, standard UV lamps, blue and near-infrared lasers. Thus, a dual-mode optical conversion strategy for inactivating bacteria is fabricated, and this multi-responsive deep-UV emitter offers new insights into developing UV light sources for sterilization applications. Heterovalent substituting in trap-mediated host lattice also provides a methodological basis for the construction of multi-mode luminescent materials.
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