多格位阳离子共掺提升LiScSi2O6∶Cr3+近红外荧光粉的光吸收
Enhancing Light Absorption of LiScSi2O6:Cr3+ NIR-emitting Phosphors via Multisite Cation Substitution
于世杰 1伍宇博 1段道川 1邵起越 1蒋建清1
作者信息
- 1. 东南大学 材料科学与工程学院,江苏 南京 210089
- 折叠
摘要
采用高温固相法制备Na+、In3+、Ge4+单掺或共掺杂的LiScSi2O6∶Cr3+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+、In3+、Ge4+等离子单独掺杂均可提升LiScSi2O6∶Cr3+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Cr3+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LiSc0.4In0.6Si1.6Ge0.4O6∶Cr3+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Cr3+激活近红外荧光粉的光吸收提供了一种有效手段.
Abstract
Na+/In3+/Ge4+ singly-doped or co-doped LiScSi2O6∶Cr3+ 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 LiScSi2O6∶Cr3+ phosphor by single ion substitution,such as Na+ for Li+,In3+ for Sc3+,and Ge4+ for Si4+.The absorption efficiency(AE)can be further increased by multisite cation substitution with Na+,In3+ and Ge4+,from an AE value of 50.5%for the LiScSi2O6∶Cr3+ phosphor to 60.9%for the Li0.8Na0.2Sc0.4In0.6Si1.6Ge0.4O6∶Cr3+ phosphor.The light absorption enhancement can be attributed to the increased distortion degree of Cr3+ coordination octahedron caused by single ion substitution or multisite cation substitution.The optimized LiSc0.4In0.6Si1.6Ge0.4O6∶Cr3+ 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 Cr3+-activated NIR phosphors.
关键词
近红外荧光粉/Cr3+激活/多格位掺杂/光吸收调控Key words
NIR phosphor/Cr3+ activated/multisite cation substitution/light absorption regulation引用本文复制引用
基金项目
江苏省科技成果转化专项资金项目(BA2020007)
出版年
2024
国家科技期刊平台
NSTL
万方数据