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Competitive Cr3+ occupation in persistent phosphors toward tunable traps distribution for dynamic anti‐counterfeiting.
- Source :
- Journal of the American Ceramic Society; Oct2021, Vol. 104 Issue 10, p5224-5234, 11p, 1 Color Photograph, 1 Diagram, 5 Graphs
- Publication Year :
- 2021
-
Abstract
- Red/near infrared (NIR) long persistent phosphors have received extensive attentions in biomedical, food inspection, iris recognition, biological imaging, etc. Herein, a new phosphor, Li2ZnGe3O8:Cr3+, is reported with deep red persistent luminescence peaking at 708 nm. By adjusting the Cr3+ doping concentration, the competitive site occupation at [ZnO6] and [GeO6] polyhedral enables different traps behaviors including trap types, trap concentration and trap depth, which in turn leads to different afterglow duration time from 2 to 20 h. The persistent luminescence mechanisms originated from different trap models have been discussed, and it is found that they can cooperate or inhibit each other, enabling different luminescence depending on time. The dynamic anti‐counterfeiting applications have been demonstrated, which provides a new way to rationally designing for multi‐functional luminescent materials. [ABSTRACT FROM AUTHOR]
- Subjects :
- PHOSPHORS
FOOD inspection
IRIS recognition
LUMINESCENCE
DOPING agents (Chemistry)
Subjects
Details
- Language :
- English
- ISSN :
- 00027820
- Volume :
- 104
- Issue :
- 10
- Database :
- Complementary Index
- Journal :
- Journal of the American Ceramic Society
- Publication Type :
- Academic Journal
- Accession number :
- 151568488
- Full Text :
- https://doi.org/10.1111/jace.17914