Large-scale control of enhancement and quenching of photoluminescence for ZnSe/ZnS quantum dots and Ag nanoparticles in aqueous solution  

作　　者：Shaoyi Yin Liming Liao Song Luo Zhe Zhang Xiaoyu Zhang Jian Lu Zhanghai Chen 殷少轶;廖李明;罗松;张喆;张晓宇;鹿建;陈张海(State Key Laboratory of Surface Physics, Key Laboratory of Micro and Nano Photonic Structures (Ministry of Education),Department of Physics, Collaborative Innovation Center of Advanced Microstructures, Fudan University;Research Center of Quantum Macro-Phenomenon and Application, Shanghai Advanced Research Institute,Chinese Academy of Sciences)

机构地区：[1]State Key Laboratory of Surface Physics, Key Laboratory of Micro and Nano Photonic Structures (Ministry of Education),Department of Physics, Collaborative Innovation Center of Advanced Microstructures, Fudan University [2]Research Center of Quantum Macro-Phenomenon and Application, Shanghai Advanced Research Institute,Chinese Academy of Sciences

出　　处：《Chinese Physics B》2019年第5期338-342,共5页中国物理B（英文版）

基　　金：Project supported by the National Key R&D Program of China(Grant No.2018YFA0306304);the National Natural Science Foundation of China(Grant No.11674069)

摘　　要：We investigated the optical properties of hybrid exciton–plasmon coupling ensembles composed of ZnSe/ZnS quantum dots and Ag nanoparticles in aqueous solution. We modulated their average interval by changing the ratio of quantum dots and Ag nanoparticles. The transition from dramatic PL enhancement to PL quenching state was experimentally observed, according to the continuous decrease of the PL lifetime. The PL enhancement rate exceeded 10, with the Purcell factor of 3.5. Meanwhile, the proportion of fast decay increased from 0.3 to 0.6, corresponding to the proportion of slow decay decreased from 0.7 to 0.4. Our experiment is important for the hybrid exciton–plasmon coupling system to be practicable in optoelectronic application.We investigated the optical properties of hybrid exciton–plasmon coupling ensembles composed of ZnSe/ZnS quantum dots and Ag nanoparticles in aqueous solution. We modulated their average interval by changing the ratio of quantum dots and Ag nanoparticles. The transition from dramatic PL enhancement to PL quenching state was experimentally observed, according to the continuous decrease of the PL lifetime. The PL enhancement rate exceeded 10, with the Purcell factor of 3.5. Meanwhile, the proportion of fast decay increased from 0.3 to 0.6, corresponding to the proportion of slow decay decreased from 0.7 to 0.4. Our experiment is important for the hybrid exciton–plasmon coupling system to be practicable in optoelectronic application.

关 键 词：ZnSe/ZnS quantum DOTS ENHANCEMENT and QUENCHING localized surface PLASMONS aqueous solution 

分 类 号：O4[理学—物理]