Ho3+共掺杂对NaYTiO4∶Er3+发光粉上转换发光调控作用研究  

The effect of Ho3+ co-doping on up-conversion luminescence of NaYTiO4∶Er3+ phosphor

作　　者：张楠[1] 付姚 张常龙 史月 邢明铭 田莹 罗昔贤 ZHANG Nan;FU Yao;ZHANG Changlong;SHI Yue;XING Mingming;TIAN Ying;LUO Xixian(Institute of Physics and Electronic Technology,Liaoning Normal University,Dalian 116026,China;School of science,Dalian Maritime University,Dalian 116026,China)

机构地区：[1]辽宁师范大学物理与电子技术学院,辽宁大连116029 [2]大连海事大学理学院,辽宁大连116026

出　　处：《功能材料》2019年第11期11190-11193,共4页Journal of Functional Materials

基　　金：中央高校基本科研业务费资助项目(3132019337)

摘　　要：采用固相法于1 100℃下成功制备了钙钛矿结构NaYTiO4∶Er^3+, Ho^3+上转换发光粉。借助980 nm激光器系统研究了发光粉的上转换发光(UCL)特性及掺杂离子对UCL色纯度的调控作用。上转换发光测试结果表明,发光粉的上转换发光由波长位于525~560 nm的绿光和640~680 nm的红光组成,分别源于Er^3+的2H11/2、4S3/2→4I15/2跃迁和4F9/2→4I15/2跃迁。Ho^3+共掺杂会显著改变发光粉UCL的光谱组成。Er^3+离子单掺时,上转换发光以绿光为主。随着Ho^3+离子的引入,发光粉红光发射占据主导,且红绿光强度分支比(IR/IG)随Ho^3+浓度的提高由0.97增大到6.30,呈现优异红光色纯度。上述现象可归因于Er^3+→Ho^3+的能量传递。Ho^3+共掺杂引起的4S3/2(Er^3+)+5I8(Ho^3+)→4I13/2(Er^3+)+5I6(Ho^3+)过程,为Er^3+离子绿光的猝灭提供了渠道,随后Er^3+的4I13/2→4F9/2激发态吸收导致了红光发射的显著增强。The NaYTiO4∶Er^3+,Ho^3+ up-conversion phosphors were successfully prepared by solid-state method at 1 100 ℃. The up-conversion luminescence(UCL) characteristics of the phosphor excited by 980 nm laser were systematically studied. The modulation effect of the doping ions on UCL color purity were also discussed. Spectrum measurement results confirmed that the emission peaks of the phosphor are located in 520-560 nm and 640-680 nm which correspond to the 2H11/2,4S3/2→4I15/2 and 4F9/2→4I15 transfers of Er^3+ ion, respectively. The Ho^3+ ion doping has a significant effect on the spectral composition of the phosphor. The phosphor single doped with Er^3+ ion mainly shows green emissions.When the phosphors are co-doped with Ho^3+ ions, the red emission gradually dominates the UCL process and the intensity ratio value of red and green emissions(IR/IG) improves from 0.97 to 7.30 with the increasing Ho^3+ concentration. Therefore, a red emission with excellent color purity is observed. This phenomenon can be attributed to the Er^3+→Ho^3+ energy transfer process.The energy transfer of 4S3/2(Er^3+) +5I8(Ho^3+)→ 4I13/2(Er^3+) + 5I6 (Ho^3+) caused by Ho^3+ co-doping provides an effective way for the green emission quenching of Er^3+ ions.The following 4I13/2→4F9/2 excited state absorption process of Er^3+ leads to significant enhancement on red UCL.

关 键 词：固相法 上转换发光 NaYTiO4 Er^3+、Ho^3+共掺 

分 类 号：O483.2[理学—固体物理]