Valence conversion and site reconstruction in nearinfrared-emitting chromium-activated garnet for simultaneous enhancement of quantum efficiency and thermal stability  

作　　者：Dongjie Liu Guogang Li Peipei Dang Qianqian Zhang Yi Wei Lei Qiu Hongzhou Lian Mengmeng Shang Jun Lin 

机构地区：[1]State Key Laboratory of Rare Earth Resource Utilization,Changchun Institute of Applied Chemistry,Chinese Academy of Sciences,Changchun 130022,China [2]Faculty of Materials Science and Chemistry,China University of Geosciences,Wuhan 430074,China [3]Zhejiang Institute,China University of Geosciences,Hangzhou 311305,China [4]University of Science and Technology of China,Hefei 230026,China [5]School of Material Science and Engineering,Shandong University,Jinan 266071,China

出　　处：《Light(Science & Applications)》2023年第11期2411-2422,共12页光（科学与应用)（英文版）

基　　金：This work was financially supported by the National Science and Technology Major Project(2022YFB3503800);the National Natural Science Foundation of China(NSFC Nos.51932009,51929201,52072349,52172166,12374386,12374388,12304461,U2005212);the Natural Science Foundation of Zhejiang Province(LR22E020004);the Project funded by China Postdoctoral Science Foundation(2022TQ0365,2023M733436).

摘　　要：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 Ca_(3)Y_(2-2x)(ZnZr)_(x)Ge_(3)O_(12):Cr garnet system by chemical unit cosubstitution,and revealed universal structure-property relationship and the luminescence optimization mechanism.The cosubstitution of[Zn^(2+)-Zr^(4+)]for[Y^(3+)-Y^(3+)]played a critical role as reductant to promote the valence transformation from Cr^(4+)to Cr^(3+),resulting from the reconstruction of octahedral sites for Cr^(3+).The introduction of[Zn^(2+)-Zr^(4+)]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.

关 键 词：SIMULTANEOUS CHROMIUM GARNET 

分 类 号：O657.34[理学—分析化学]