Cr^(3+) activated Na_(3)RESi_(3)O_(9)(RE=Y,Lu,Sc) silicate broadband near-infrared phosphors for luminescence towards NIR-Ⅱ region via a multi-site occupancy strategy  

作　　者：Jiantong Wang Changshuai Gong Sihan Yang Qi Zhu Xuejiao Wang Ji-Guang Li 

机构地区：[1]College of Chemistry and Materials Engineering,Bohai University,Jinzhou,121007,China [2]Key Laboratory for Anisotropy and Texture of Materials(Ministry of Education),School of Materials Science and Engineering,Northeastern University,Shenyang,110819,China [3]Research Center for Electronic and Optical Materials,National Institute for Materials Science,Tsukuba,Ibaraki 305-0044,Japan

出　　处：《Journal of Rare Earths》2024年第8期1447-1457,I0002,共12页稀土学报（英文版）

基　　金：supported by the Natural Science Foundation of The Educational Department of Liaoning Province (JYTMS20231627);the Natural Science Foundation of Liaoning Province (2020-MS-286)。

摘　　要：Phosphor-converted near-infrared light-emitting diodes(NIR pc-LEDs) are finding applications in various fields including food quality analysis,biomedical imaging,night vision,and biomedicine.The crucial factor in the development of NIR pc-LEDs devices lies in the advancement of high-performance broadband NIR phosphors,In this work,novel Cr^(3+)-activated silicate phosphors NaRESi_(3)O_(9)(RE=Y,Lu,Sc) are reported.This silicate has a special 3D network structure in which RE has four different sites,forming four octahedrons and providing suitable occupation sites for Cr^(3+).The phosphors demonstrate a wide emission spectrum ranging from 750 to 1450 nm when excited by light at 468 nm.The full width at half maximum(FWHM),which benefits from the presence of Cr^(3+)ions occupying multiple sites,is measured to be 203 nm.Notably,the strongest emission peak is observed at a longer wavelength of 984 nm compared to most other systems activated by Cr^(3+).The Na_(3)ScSi_(3)O_(9) lattice provides a weak crystal field(Dq/B=1.97) and weak phonon-photon coupling for Cr^(3+),and the integrated emission intensity of Na_(3)ScSi_(3)O_(9):0,03Cr^(3+)is 4.66 times stronger than that of Na_(3)YSi_(3)O_(9):0.03Cr^(3+).

关 键 词：Rare earths Broadband near-infrared SILICATE Photoluminescence Cr^(3+) 

分 类 号：TN312.8[电子电信—物理电子学] TQ422[化学工程]