摘要
荧光粉转换型宽带发射近红外LED在食品检测、生物医药、安防监控等领域具有重要的应用价值。本工作介绍了一种具有宽带近红外发射的LaSc_(3)(BO_(3))_(4)∶Cr^(3+)(LSB∶Cr^(3+))荧光粉,在460 nm蓝光激发下,其发射覆盖650~1200 nm范围,半高宽达到170 nm。在此基础上,通过Yb 3+共掺,有效提升了其发光性能,其中发射峰半高宽拓宽到223 nm,最高发光量子产率由14%提升至35%,发光热稳定性也得到显著提高。基于荧光粉的发光量子产率、荧光寿命和发光热稳定性等数据分析,发现Yb^(3+)共掺杂对材料发光热稳定性的改善主要源于Cr^(3+)与Yb^(3+)之间的高效能量传递,并且Yb^(3+)在基质材料中表现出更好的热稳定性。最后,将LSB∶Cr^(3+),Yb^(3+)荧光粉与蓝光LED芯片结合,制备成近红外LED器件,在60 mA驱动电流下,近红外输出功率达16 mW。以上结果表明,LSB∶Cr^(3+),Yb^(3+)荧光粉是一种潜在的近红外LED用发光材料。
Near-infrared phosphor-converted LEDs(NIR pc-LEDs)play an important role in the applications of food analysis,biomedicine,security monitoring,etc.In this study,a broadband near-infrared phosphor LaSc_(3)(BO_(3))_(4)∶Cr^(3+)(LSB∶Cr^(3+))is presented.Under 460 nm excitation,the emission band of LSB∶Cr^(3+) covers the spectral range of 650-1200 nm with a full width at half maximum(FWHM)of 170 nm.Furthermore,the performance of LSB∶Cr^(3+) phosphor is improved by Yb^(3+) co-doping,leading to the broadened FWHM(up to 223 nm),increased photoluminescence quantum yield(PL QY,from 14%to 35%)and reduced PL thermal quenching.Based on the analysis of PL spectrum,PL QYs,PL decay curves and PL thermal stability,it is revealed that the improvement of PL thermal stability by Yb^(3+) co-doping principally originates from the efficient energy transfer from Cr^(3+) to more thermally stable Yb 3+emitters.Finally,a NIR pc-LED is fabricated by combining the LSB∶Cr^(3+),Yb^(3+) phosphor with blue LED chip,which exhibits a maximum NIR output power of 16 mW at 60 mA drive current.These results suggest that LSB∶Cr^(3+),Yb^(3+) phosphor is a promising luminescent converter for broadband NIR pc-LED.
作者
邬金闽
黄得财
梁思思
徐寿亮
朱浩淼
WU Jin-min;HUANG De-cai;LIANG Si-si;XU Shou-liang;ZHU Hao-miao(College of Material Engineering,Fujian Agriculture and Forestry University,Fuzhou 350002,China;CAS Key Laboratory of Design and Assembly of Functional Nanostructures,Fujian Key Laboratory of Nanomaterials,Fujian Institute of Research on The Structure of Matter,Chinese Academy of Sciences,Fuzhou 350002,China;Xiamen Key Laboratory of Rare Earth Photoelectric Functional Materials,Xiamen Institute of Rare Earth Materials,Haixi Institute,Chinese Academy of Sciences,Xiamen 361021,China)
出处
《发光学报》
EI
CAS
CSCD
北大核心
2021年第6期793-803,共11页
Chinese Journal of Luminescence
基金
国家自然科学基金(11904363)资助项目。
