NaYF_4∶Yb^(3+),Er^(3+)纳米粒子的上转换发光的温度特性  

Temperature Dependence of Upconversion Luminescence in NaYF_4∶ Yb^(3+),Er^(3+)Nanoparticles

作　　者：赵承周[1,2] 孔祥贵 宋曙光[1] 曾庆辉[1] 

机构地区：[1]发光学及应用国家重点实验室中国科学院长春光学精密机械与物理研究所,吉林长春130033 [2]中国科学院大学,北京100049

出　　处：《发光学报》2013年第10期1283-1287,共5页Chinese Journal of Luminescence

基　　金：国家自然科学基金(61275202;61275197;11174277;11004189;21304084)资助项目

摘　　要：利用高温热溶剂法合成了NaYF4∶20%Yb3+,2%Er3+纳米粒子,通过X射线衍射谱、扫描电镜及低温荧光光谱对其结构、形貌及发光性质进行了表征。研究结果表明:合成的纳米粒子为六角相,粒径大小约30nm。变温光谱研究表明:由于4S3/2和2H11/2能级差较小,当温度增加至45 K时,4S3/2能级和2H11/2能级的电子布局同时相应地增加;而当温度超过45 K之后,温度依赖的2H11/2能级布局随着温度的提高而增多,表现为520 nm的发光随着温度的提高一直增强。由于无辐射弛豫速率随温度升高而快速增加,导致545 nm的发光随着温度的提高先增强后减弱。Uniform NaYF4∶ 20% Yb3+,2%Er3+nanoparticles were synthesized via solvothermal method following high temperature. The X-ray diffraction( XRD) shows that the samples are β-NaYF4 nanocrystals,and SEM images show that the nanoparticles have an average of 30 nm. The intensity of 520 nm emissions gradually increase with temperature rising from 13 K to 300 K,while the intensity of 545 nm emissions first increase and then decrease under 980 nm laser excitation. The reason for this phenomenon is that the electronic distribution of 2H11 /2is dependent on the temperature,while the emissions of 4S3 /2energy level is governed by a competition process between the thermal agitation and non-radiation decay.

关 键 词：稀土离子 NaYF4∶Yb3+ Er3+ 上转换发光 变温光谱 

分 类 号：O482.31[理学—固体物理]