晶体基质对稀土上转换纳米材料中能量转换机理的影响  

Effect of Crystal Matrix on Energy Transfer Mechanism in Rare-earth Upconversion Nanomaterials

作　　者：唐可云 李萝园 付立民[1] 艾希成[1] 张建平[1] TANG Keyun;LI Luoyuan;FU Limin;AI Xicheng;ZHANG Jianping(Department of Chemistry,Renmin University of China,Beijing 100872,China)

机构地区：[1]中国人民大学化学系,北京100872

出　　处：《高等学校化学学报》2018年第10期2136-2142,共7页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金(批准号:21373268;21227803);中国人民大学基金(批准号:15XNLQ04;10XNI007);吉林大学集成光电国家重点实验室开放基金(批准号:IOSKL2015KF33)资助~~

摘　　要：采用溶剂热法制备了尺寸均一、形貌规整的Yb^(3+),Er^(3+)共掺NaREF4(RE^(3+)=Lu^(3+),Y^(3+),Yb^(3+))纳米材料,借助稳态发光光谱和时间分辨光谱技术表征了3种基质纳米材料上转换发光行为的特性,并评估了能量传递机制.结果表明,NaLuF_4∶20%Yb^(3+),2%Er^(3+)纳米材料具有较强的稳态发光强度、较高的绿红比(540 nm/654 nm)和较长的发光寿命,NaYbF_4∶2%Er^(3+)纳米材料具有较弱的上转换发光强度、较低的绿红比(540 nm/654 nm)和较短的发光寿命.结合实验数据及能量传递机制,探讨了不同基质(NaLuF_4,NaF_4,NaYbF_4)在稀土掺杂纳米材料中对上转换能量传递机制的影响,解释了NaLuF_4基质纳米材料是较好基质材料的原因.Yb 3+,Er 3+doped NaREF 4(RE 3+=Lu 3+,Y 3+,Yb 3+)nanoparticles with uniform size and hexagonal-phase were prepared by the solvothermal method.The steady-state luminescence spectra and the time-resolved luminescence spectra were characterized to explore the luminescence properties for the{evaluation}of{energy}transfer mechanisms in three matrix(NaLuF 4,NaYF 4,NaYbF 4)nanomaterials.The experimental data showed that NaLuF 4∶20%Yb 3+,2%Er 3+nanomaterial performed stronger upconversion luminescence(UCL)intensity,relatively higher green/red ratio(I 540 nm/I 654 nm)and longer luminescence lifetimes,while NaYbF 4∶2%Er 3+nanomaterial presented relatively weaker properties in these aspects.The difference of energy transfer mechanisms in three matrix(NaLuF 4,NaYF 4,NaYbF 4)nanoparticles was also displayed and analyzed.Comparative results showed why the NaLuF 4 matrix nanoparticles were the best matrix materials from the perspective of the UCL energy transfer mechanisms.This work provides new insights that the energy transfer process can be influenced%via%changing the matrix nanoparticles,and can give helpful guidance for the future optical UCL applications of rare-earth doped nanomaterials.Supported by the National Natural Science Foundation of China(Nos.21373268,21227803),the Open Funding of Renmin University of China(Nos.15XNLQ04,10XNI007)and the Open Funding of the State Key Laboratory on Integrated Optoelectronics of Jilin University,China(No.IOSKL2016KF33).

关 键 词：稀土掺杂纳米材料 上转换发光 基质材料 能量传递机制 时间分辨荧光光谱 

分 类 号：O614.34[理学—无机化学] O644.1[理学—化学]