Cr^(3+)掺杂LiScSi_(2)O_(6)近红外荧光粉的荧光性能及pc-LED器件研究  

Research on fluorescence properties of Cr^(3+) in matrix LiScSi_(2)O_(6) and device performance of as-Fabricated pc-LED

作　　者：陈雪花[1] 胡贞华 CHEN Xuehua;HU Zhenhua(School of Intelligent Engineering,Shaoguan University,Shaoguan 512005,China;School of Information Engineering,Shaoguan University,Shaoguan 512005,China)

机构地区：[1]韶关学院智能工程学院,广东韶关512005 [2]韶关学院信息工程学院,广东韶关512005

出　　处：《光学技术》2022年第6期668-673,共6页Optical Technique

基　　金：中国高校产学研创新基金(2020ITA02048)。

摘　　要：红外荧光粉是制备基于蓝光芯片宽带近红外光源的关键。采用高温固相法制备了LiScSi_(2)O_(6):Cr^(3+)近红外荧光粉样品并制备了相应的pc-LED器件,详细研究了样品的光致发光特性及pc-LED的性能。荧光粉在460nm蓝光激发下产生中心波长为850nm,半高宽约为156nm的宽带近红外光谱。在温度为160℃时,发光峰的强度下降为室温下的75.38%。把粉体涂覆在InGaN蓝光芯片(P_(max)=5W)表面制备的近红外pc-LED,得到最大近红外光输出功率为436.7mW@300mA,最大电光转化效率为18.3%@1mA。采用pc-LED作为红外光源,隐藏在油墨下的文字信息清晰可见,表明该红外荧光粉可用于制备基于蓝光芯片的宽带红外光源,且在夜视和信息防伪领域有良好的应用前景。Phosphor-conversion light emitting diode(pc-LED),which is fabricated by covering infrared phosphor on the blue light diodes,is an ideal near-infrared(NIR) light source for its advantage of broadband,low power dissipation and easy integration in circuits.And discovering of high efficiency broadband near-infrared emission phosphor for light-emitting diodes is key to this technology.Herein,considering the high thermal stability of silicate matrix,and the similar ion radius of Sc^(3+) and Cr^(3+),a chromium doped silicate LiScSi_(2)O_(6)(LiScSi_(2)O_(6)∶Cr^(3+)) broadband NIR phosphor was prepared in this work by high temperature solid state,which emits a broadband NIR light,peaking at ~850 nm,with a full width at half maximum(FWHM) of ~156 nm,under the 450 nm blue light excitation.The luminescence intensity remains 75.38% of that of at room temperature when the phosphor’s temperature is of 160℃.The luminescence mechanism of Cr^(3+) in LiScSi_(2)O_(6) matrix and the model of thermal quenching were also discussed in this paper.A NIR pc-LED was fabricated by combined the phosphor with blue light LED chip,which shows a maximum output NIR power of 436.7 mW @ 300 mA,and a maximum electron-photon efficiency of 18.3% @ 1 mA.This as-fabricated NIR pc-LED is also small in size light and in weight,and can be easily integrated in circuits,which made it have a good application prospect in the domain of night vision and information anti-counterfeiting.

关 键 词：近红外 荧光粉 铬 宽带 荧光转换发光二极管 

分 类 号：TN213[电子电信—物理电子学] TN214[化学工程] TQ422