In^(3+)共掺杂诱导NaY_(0.95-x)Yb_(0.03)Er_(0.02)F_4相转变与上转换发光增强研究  

Phase Transition Induction and Upconversion Luminescence Enhancement of NaY_(0.95-x)Yb_(0.03)Er_(0.02)F_4 by In^(3+)Codoping

作　　者：俞瀚[1] 黄清明[1,2] 曹文兵[1] 张新奇[2] 俞建长[1] 

机构地区：[1]福州大学材料科学与工程学院,福州350108 [2]福州大学测试中心,福州350002

出　　处：《化学学报》2013年第12期1639-1646,共8页Acta Chimica Sinica

基　　金：福建省自然科学基金(No.2013J05027);福建省中青年教师教育科研项目(No.JA13050)资助~~

摘　　要：引入In3+作为新的掺杂离子通过水热法合成了In3+与Er3+,Yb3+共掺杂的NaYF4上转换发光材料.通过XRD表征及Rietveld精修,SEM以及TEM研究了In掺杂引起的NaYF4形貌与晶体结构的变化.通过发射光谱与发光衰减曲线表征了掺杂NaYF4的上转换发光性能,以研究晶体微观结构与上转换发光性能之间的关系.结果表明随着In掺杂量的增加,立方相NaYF4的晶格畸变不断增强且发生由立方相向六方相的转变.对于六方相NaYF4,其上转换发光强度随着In含量的提高不断增强并当In含量为3%时达到最大值.该研究结果可以有助于设计与合成具有优良上转换发光性能的材料.In^3＋ was taken as a new dopant to codope NaYF4 with Er^3＋ and Yb^3＋ by hydrothermal synthesis in this manu- script. How to improve phase transition of NaYF4 from cubic to hexagonal and how to improve upconversion luminescence performance of hexagonal NaYF4 are both important problems because hexagonal NaYF4 is the most efficient matrix mate- rial for upconversion. Considering these two problems, we report the study of crystal structure and upconversion emission ot In3＋-codoped NaYF4 to discover phase transition mechanism and upconversion luminescence properties changed with dif- ferent In^3＋ codoping concentration. NaY0.92Yb0.03Er0.02F4 was tridoped with 0, 2, 4, 6, 8 and 10 mol% In^3＋ at 170 ℃ for 8 h in order to study phase transition of NaYF4. The other group of samples was prepared by the same procedure except In^3＋ codoping concentration was replaced as 0, 1, 2, 3, 4 and 5 tool% and the reaction proceeded at 190 ℃ for 12 h in order to obtain pure hexagonal NaYF4 for study of its upconversion luminescence. The change of morphologies and crystal structural transition caused by In3＋ codoping was explored by XRD, Rietveld refinement, SEM and TEM analysis methods, while the upconversion luminescence was characterized by emission spectra and luminescence decay curves, for the relationship be- tween crystal microstructure and luminescence properties to be discussed in our investigation. On the basis of these charac- terizations we found that with rising of the In^3＋ codoping concentration, the phase transition of NaYF4 from cubic to hex- agonal was improved. The intensity of upconversion luminescence was also found to be increased to the maximum when 3 tool% In^3＋ was codoped into hexagonal NaYF4. The analysis and discussion discovered that the phase transition of NaYF4 was correlated with the lattice distortion of cubic NaYF4 improved by In^3＋ codoping. The intensity of upconversion lumi- nescence was proved to be increased by the asymmetry of the local crystal field changed with the In^

关 键 词：上转换 In^3+ 掺杂 相转变 发光 氟钇酸钠 

分 类 号：O482.31[理学—固体物理]