反向能量传递增强Er^(3+)上转换发光  

Back Energy Transfer Enhances Er^(3+)Upconversion Luminescence

作　　者：杨润 陈浩然 涂浪平[1] 李齐清 常钰磊[1] YANG Run;CHEN Haoran;TU Langping;LI Qiqing;CHANG Yulei(State Key Laboratory of Luminescence and Applications,Changchun Institute of Optics,Fine Mechanics and Physics,Chinese Academy of Sciences,Changchun 130033,China;University of Chinese Academy of Sciences,Beijing 100049,China)

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

出　　处：《发光学报》2023年第9期1552-1559,共8页Chinese Journal of Luminescence

基　　金：国家自然基金(62075217,11874354,11874355,61575194);国家重点研发计划(2021YFA0715603);吉林省科技厅项目(20210101148JC,202512JC010475440,20230508104RC);发光学及应用国家重点实验室(SKLA-2019-02,SKLA-2020-09)。

摘　　要：提高上转换发光效率是促进上转换发光材料实际应用的关键。在NaErF_(4)@NaYF_(4)体系中,惰性NaYF_(4)壳层可以抑制高组分Er^(3+)掺杂下的发光浓度猝灭,其上转换发光主要来源于Er^(3+)-Er^(3+)的能量传递上转换。本文利用共沉淀法制备了Er^(3+)和Yb^(3+)分区掺杂的NaErF_(4)@NaYbF_(4)@NaYF_(4)核壳结构的纳米颗粒,通过包覆惰性壳层研究Er^(3+)-Yb^(3+)-Er^(3+)之间的能量传递和反向能量传递过程。由于808 nm波长只能激发Er^(3+)而不能激发Yb^(3+),因此在808 nm波长激发下,Er^(3+)在惰性壳层的保护作用下将激发态能量传递给Yb^(3+),随后通过反向能量传递回Er^(3+),使得Er^(3+)的上转换发光增强。实验结果发现,当中间层Yb^(3+)掺杂浓度为100%时,绿色和红色上转换发光最大增强倍数为24.9和9.79。Improving the upconversion luminescence efficiency is the key to promoting the practical application of upconversion luminescent materials.In the NaErF_(4)@NaYF_(4) system,the inert NaYF_(4) shell can inhibit the concentration quenching under high Er^(3+)doping,and the upconversion luminescence is mainly from the energy transfer upconversion of Er^(3+)-Er^(3+).In this paper,Er^(3+)and Yb3+partition doped NaErF4@NaYbF4@NaYF4 core-shell nanoparticles were prepared by the coprecipitation method,and the energy transfer and back energy transfer processes between Er^(3+)-Yb^(3+)-Er^(3+)was studied.Since the 808 nm can only excite Er^(3+)but not Yb^(3+),under 808 nm excitation,Er^(3+)harvests the pumping energy and transfers it to Yb^(3+)and subsequently back to Er^(3+)due to the protection offered by NaYF_(4) inert outer shell,which finally enhances the upconversion luminescence of Er^(3+).When the doping concentration of Yb^(3+)in the intermediate layer is 100%,the maximum enhancement multiple is 24.9 and 9.79 for green and red upconversion,respectively.

关 键 词：稀土纳米材料 上转换发光 反向能量传递 β-NaErF_(4) 

分 类 号：O482.31[理学—固体物理]