多格位阳离子共掺提升LiScSi_(2)O_(6)∶Cr^(3+)近红外荧光粉的光吸收  

Enhancing Light Absorption of LiScSi_(2)O_(6)∶Cr^(3+) NIR-emitting Phosphors via Multisite Cation Substitution

作　　者：于世杰 伍宇博 段道川 邵起越[1] 蒋建清[1] YU Shijie;WU Yubo;DUAN Daochuan;SHAO Qiyue;JIANG Jianqing(School of Material Science and Engineering,Southeast University,Nanjing 210089,China)

机构地区：[1]东南大学材料科学与工程学院,江苏南京210089

出　　处：《发光学报》2024年第3期415-423,共9页Chinese Journal of Luminescence

基　　金：江苏省科技成果转化专项资金项目(BA2020007)~~。

摘　　要：采用高温固相法制备Na^(+)、In^(3+)、Ge^(4+)单掺或共掺杂的LiScSi_(2)O_(6)∶Cr^(3+)荧光粉,通过漫反射光谱、光致激发和发射光谱、量子效率测试等手段对其光吸收及光致发光性能进行了研究。实验结果表明,Na^(+)、In^(3+)、Ge^(4+)等离子单独掺杂均可提升LiScSi_(2)O_(6)∶Cr^(3+)荧光粉对460 nm蓝光的吸收,而多格位阳离子共掺可进一步增强光吸收能力,吸收效率可从最初的50.5%提升至60.9%。多格位离子单掺或共掺引起Cr^(3+)占据八面体结构畸变程度增加,从而导致光吸收增强。优化荧光体系LiSc_(0.4)In_(0.6)Si_(1.6)Ge_(0.4)O_(6)∶Cr^(3+)的近红外发射峰波长为860 nm,半高宽为160 nm,内、外量子效率分别为72.5%和41.8%,封装制成的荧光转换型LED器件在100 mA驱动电流下近红外光输出功率为63.1 mW,近红外电光转换效率为22.3%,表现出较好的近红外发光综合性能。本研究工作为增强Cr^(3+)激活近红外荧光粉的光吸收提供了一种有效手段。Na^(+)/In^(3+)/Ge^(4+) singly-doped or co-doped LiScSi_(2)O_(6)∶Cr^(3+) phosphors were prepared by high-temperature sol⁃id-state reaction.Light absorption and photoluminescence(PL)properties were studied by diffuse reflection spec⁃trum,PL excitation/emission spectrum and quantum efficiency measurements.The results show that the absorption to the blue light at 460 nm can be enhanced for the LiScSi_(2)O_(6)∶Cr^(3+) phosphor by single ion substitution,such as Na^(+) for Li^(+),In^(3+) for Sc^(3+),and Ge^(4+) for Si4^(+).The absorption efficiency(AE)can be further increased by multisite cation substitution with Na^(+),In^(3+) and Ge^(4+),from an AE value of 50.5%for the LiScSi_(2)O_(6)∶Cr^(3+) phosphor to 60.9%for the Li_(0.8)Na_(0.2)Sc_(0.4)In_(0.6)Si_(1.6)Ge_(0.4)O_(6)∶Cr^(3+) phosphor.The light absorption enhancement can be attributed to the increased distortion degree of Cr^(3+) coordination octahedron caused by single ion substitution or multisite cation substitution.The optimized LiSc_(0.4)In_(0.6)Si_(1.6)Ge_(0.4)O_(6)∶Cr^(3+) phosphor exhibits a broadband near-infrared(NIR)emission peaking at~860 nm,with a full width at half maximum(FWHM)of~160 nm and an internal(external)quantum efficiency of 72.5%(41.8%).The fabricated phosphor-converted LED(pc-LED)device shows a NIR output power of 63.1 mW and an energy conversion efficiency of 22.3% at 100 mA drive current.The study provides an effective approach to enhance the light absorption capacity of Cr^(3+)-activated NIR phosphors.

关 键 词：近红外荧光粉 Cr^(3+)激活 多格位掺杂 光吸收调控 

分 类 号：O482.31[理学—固体物理]