Valence conversion and site reconstruction in near-infrared-emitting chromium-activated garnet for simultaneous enhancement of quantum efficiency and thermal stability
Light: Science and Applications, ISSN: 2047-7538, Vol: 12, Issue: 1, Page: 248
2023
- 63Citations
- 19Captures
- 4Mentions
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Most Recent News
New Light Science Study Results from Chinese Academy of Sciences Described (Valence conversion and site reconstruction in near-infrared-emitting chromium-activated garnet for simultaneous enhancement of quantum efficiency and thermal stability)
2023 OCT 25 (NewsRx) -- By a News Reporter-Staff News Editor at NewsRx Science Daily -- Investigators publish new report on light science. According to
Article Description
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 CaY(ZnZr)GeO:Cr garnet system by chemical unit cosubstitution, and revealed universal structure-property relationship and the luminescence optimization mechanism. The cosubstitution of [Zn–Zr] for [Y–Y] played a critical role as reductant to promote the valence transformation from Cr to Cr, resulting from the reconstruction of octahedral sites for Cr. The introduction of [Zn–Zr] 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.
Bibliographic Details
Springer Science and Business Media LLC
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