Zn^(2+)掺杂MgGa_(2)O_(4):Ni^(2+)近红外二区发光材料制备、表征及其成像应用研究  

Preparation and Characterization of Zn^(2+)-doped MgGa2O4:Ni^(2+)NIR-ⅡPhosphors and Their Application in Imaging

作　　者：张琳 杨健[1] 李胜男[1] 王帅 祝汉成[1] 严端廷[1] 徐长山[1] 刘玉学[1] ZHANG Lin;YANG Jian;LI Shengnan;WANG Shuai;ZHU Hancheng;YAN Duanting;XU Changshan;LIU Yuxue(School of Physics,Northeast Normal University,Changchun 130024,China)

机构地区：[1]东北师范大学物理学院,吉林长春130024

出　　处：《发光学报》2024年第8期1311-1324,共14页Chinese Journal of Luminescence

基　　金：国家自然科学基金(12204093,12074062,12374391);吉林省自然科学基金(20220101018JC)。

摘　　要：通过水热法结合后期真空热处理的方法制备了具有反尖晶石结构的Zn_(x)Mg_(0.993-x)Ga_(2)O_(4):0.7%Ni^(2+)(x=0~0.5)(ZMGO:Ni^(2+))近红外二区(NIR-Ⅱ:1000~1700 nm)荧光粉。随着Zn^(2+)掺杂量的增加,ZMGO:Ni^(2+)粉体样品的粒子尺寸逐渐变大。在635 nm激光激发下,可观测到粉体样品位于~1279 nm处的宽带发射峰,其可被归属为Ni^(2+)的特征发射。此外,Zn^(2+)掺杂使样品荧光猝灭的热激活能由244 meV减小到224 meV。采用发光强度最强的ZMGO:Ni^(2+)粉体样品与620 nm红光LED芯片封装成NIR-Ⅱ荧光粉转换LED(NIR-Ⅱpc-LED),并基于NIR-Ⅱ光穿透能力强和不产生生物组织自荧光的特性,以NIR-Ⅱpc-LED为光源,分别研究了其在有遮挡情况的夜视成像和生物组织成像上的应用。Herein,a series of Zn_(x)Mg_(0.993-x)Ga_(2)O_(4):0.7%Ni^(2+)(x=0-0.5)(ZMGO:Ni^(2+))phosphors with inverse spinel structure were successfully prepared through a hydrothermal method followed by a vacuum heat treatment,emitting within the 2nd near-infrared transmittance window(NIR-Ⅱ:1000-1700 nm).The particle size of ZMGO:Ni^(2+)phosphors exhibited a gradual increase with increasing Zn^(2+)doping content.Upon excitation by a 635 nm laser,ZMGO:Ni^(2+)phosphors exhibited a broad emission band centered at approximately 1279 nm,which can be attributed to the characteristic emission of Ni^(2+).Their thermal activation energy is decreased from 244 meV to 224 meV after Zn^(2+)doping.A NIR-Ⅱphosphor-converted light-emitting diode(NIR-Ⅱpc-LED)was fabricated by employing ZMGO:Ni^(2+)phosphors with the strongest luminescence intensity,in conjunction with a 620 nm red LED chip.Based on high penetration ability,minimal scattering property and auto-fluorescence-free background of NIR-Ⅱlight,night vision imaging with occlusion and tissue imaging were performed using the NIR-Ⅱpc-LED,respectively.

关 键 词：光致发光 过渡金属离子 近红外二区 荧光粉 

分 类 号：O482.31[理学—固体物理]