Sr_(1-x)Mg_(x)LiAl_(3)N_(4):Eu^(2+)固溶体的制备与发光性能研究  

Preparation and Luminescence Properties of Sr_(1-x)Mg_(x)LiAl_(3)N_(4):Eu^(2+)Solid Solutions

作　　者：王凤翔 胡大海 王新然 张钰 王凯旋 周雪莲 朝克夫[1,2,3] WANG Fengxiang;HU Dahai;WANG Xinran;ZHANG Yu;WANG Kaixuan;ZHOU Xuelian;CHAO Kefu(College of Physics and Electron Information,Inner Mongolia Nor mal University,Hohhot 010022,China;Key Laboratory of Physics and Chemistry of Functional Materials ofInner Mongolia,Hohhot 010022,China;Inner Mongolia Engineering Research Center for Rare Earth Photovoltaic Materials and New Energy Storage,Inner Mongolia Autono mous Region,Hohhot 010022,China)

机构地区：[1]内蒙古师范大学物理与电子信息学院,呼和浩特010022 [2]内蒙古自治区功能材料物理与化学重点实验室,呼和浩特010022 [3]内蒙古稀土光伏材料与新能源储能内蒙古自治区工程研究中心,呼和浩特010022

出　　处：《内蒙古大学学报（自然科学版）》2022年第6期592-599,共8页Journal of Inner Mongolia University：Natural Science Edition

基　　金：国家自然科学基金(12164034);内蒙古自然科学基金(MS201905030);内蒙古科技计划项目(2019GG263)。

摘　　要：研究可见光区域内具有高效窄带红光发射的荧光粉是固态照明和背光显示器中的一个重要问题。本研究通过阳离子取代的方式(Mg^(2+)→Sr2+)并利用低气压烧结法合成了一系列Sr_(1-x)Mg_(x)LiAl_(3)N_(4):2%Eu^(2+)(0≤x≤0.6)固溶体。实验结果表明,随着Mg^(2+)浓度的增加,晶体结构收缩,晶格失配严重,X射线衍射图谱中的衍射峰逐渐向大角度方向移动。同时固溶体样品的激发光谱出现偏移,位于324 nm的激发峰移动到351 nm。在460 nm蓝光激发下,样品的发射光谱由650 nm红移到687 nm。通过对比固溶体样品的发光强度找到Mg^(2+)最佳掺杂浓度为10%,并将其与商用Sr2Si5N8:Eu^(2+)样品的热稳定性进行对比,结果发现Mg^(2+)取代后样品的热稳定性更加优异,在150℃时发射强度能够保持在初始强度的91.0%。最后将该荧光粉与商业化的YAG:Ce^(3+)黄色荧光粉和LED蓝光芯片相结合,得到了色温为4496 K,流明效率59.9 lm/w,显色指数Ra=80.1的白光LED器件。因此,Mg^(2+)取代后的Sr0.9Mg0.1LiAl_(3)N_(4):0.02Eu^(2+)(SMLAN:0.02Eu^(2+))样品是一种很有前途的白光LED荧光粉。The study of phosphors with efficient narrow-band red emission in the visible region is an important issue in solid-state lighting and backlit displays.A series of Sr_(1-x)Mg_(x)LiAl_(3)N_(4):2%Eu^(2+)(0≤x≤0.6)solid solutions were synthesised by cation substitution(Mg^(2+)→Sr2+)and using a low-pressure sintering method.The experimental results show that with the increase of Mg^(2+)concentration,the crystal structure shrinks,the lattice mismatch is severe and the diffraction peaks in the X-ray diffraction pattern gradually move in the direction of large angles.At the same time,the excitation spectrum of the solid solution sample shifts,and the excitation peak located at 324 nm moves to 351 nm.The sample is red-shifted from 650 nm to 687 nm under 460 nm blue light excitation,and the optimum doping concentration of Mg^(2+)is found to be 10%by comparing the luminescence intensity of the solid solution sample with that of the commercial Sr2Si5N8:Eu^(2+)sample.It is able to maintain 91.0%of the initial intensity.Finally,the phosphor is combined with a commercially available YAG:Ce^(3+)yellow phosphor and an LED blue chip to obtain a white LED device with a color temperature of 4496 K,lumen efficiency(59.9 lm/w)and color rendering index Ra=80.1.Therefore,the Mg^(2+)substituted Sr0.9Mg0.1LiAl_(3)N_(4):0.02 Eu^(2+)(SMLAN:0.02 Eu^(2+))sample is a promising white LED phosphor.

关 键 词：白光LED 红色荧光粉 固溶体 离子取代 

分 类 号：O482.31[理学—固体物理]