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Abstract
Achievement of high photoluminescence quantum efficiency and thermal stability is challenging for near-infrared (NIR)-emitting phosphors. Here, we designed a “kill two birds with one stone” strategy to simultaneously improve quantum efficiency and thermal stability of the NIR-emitting Ca3Y2-2x(ZnZr)xGe3O12:Cr garnet system by chemical unit cosubstitution, and revealed universal structure-property relationship and the luminescence optimization mechanism. The cosubstitution of [Zn2+–Zr4+] for [Y3+–Y3+] played a critical role as reductant to promote the valence transformation from Cr4+ to Cr3+, resulting from the reconstruction of octahedral sites for Cr3+. The introduction of [Zn2+–Zr4+] unit also contributed to a rigid crystal structure. These two aspects together realized the high internal quantum efficiency of 96% and excellent thermal stability of 89%@423 K. Moreover, information encryption with “burning after reading” was achieved based on different chemical resistance of the phosphors to acid. The developed NIR-emitting phosphor-converted light-emitting diode demonstrated promising applications in bio-tissue imaging and night vision. This work provides a new perspective for developing high-performance NIR-emitting phosphor materials.
Significant improvement of quantum efficiency and thermal stability of NIR-emitting Ca3Y2-2x(ZnZr)xGe3O12:Cr was achieved by chemical unit cosubstitution, benefiting from valence reduction of Cr4+ to Cr3+ and reconstructed rigid crystal structure.
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Details
1 Chinese Academy of Sciences, State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Changchun, China (GRID:grid.9227.e) (ISNI:0000000119573309)
2 China University of Geosciences, Faculty of Materials Science and Chemistry, Wuhan, China (GRID:grid.503241.1) (ISNI:0000 0004 1760 9015); China University of Geosciences, Zhejiang Institute, Hangzhou, China (GRID:grid.503241.1) (ISNI:0000 0004 1760 9015)
3 Chinese Academy of Sciences, State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Changchun, China (GRID:grid.9227.e) (ISNI:0000000119573309); University of Science and Technology of China, Hefei, China (GRID:grid.59053.3a) (ISNI:0000 0001 2167 9639)
4 China University of Geosciences, Faculty of Materials Science and Chemistry, Wuhan, China (GRID:grid.503241.1) (ISNI:0000 0004 1760 9015)
5 Shandong University, School of Material Science and Engineering, Jinan, China (GRID:grid.27255.37) (ISNI:0000 0004 1761 1174)