Wang Yingcheng, Jin Yuanhao, Zhang Tianfu, Huang Zhongzheng, Yang Haitao, Wang Jiaping, Jiang Kaili, Fan Shoushan, Li Qunqing
State Key Laboratory of Low-Dimensional Quantum Physics, Department of Physics & Tsinghua-Foxconn Nanotechnology Research Center , Tsinghua University , Beijing 100084 , China.
Collaborative Innovation Center of Quantum Matter , Beijing , China.
J Phys Chem Lett. 2019 May 2;10(9):2113-2120. doi: 10.1021/acs.jpclett.9b00818. Epub 2019 Apr 17.
A high-performance exciton-localized surface plasmon (LSP) coupling system consisting of well-designed plasmonic nanostructures and CdSe/ZnS quantum dots (QDs) was fabricated by first introducing a TaO layer as both an adhesive coating and coupling medium. It is shown that a larger emission enhancement factor of 6 from CdSe/ZnS QDs can be obtained from the strong coupling effect between QDs and triprism Au nanoarrays and the high scattering efficiency of LSPs without damping. This can be attributed to the matching conditions and a low extinction coefficient with little damping absorption of the TaO layer in the system. The radiative scattering rate of Γ can make a contribution to the spontaneous emission rate Γ and thus improve the internal quantum yield of the QDs. This strategy could be promising for practical application of metal-modified fluorescence enhancement.
通过首先引入TaO层作为粘合剂涂层和耦合介质，制备了一种由精心设计的等离子体纳米结构和CdSe/ZnS量子点（QDs）组成的高性能激子局域表面等离子体（LSP）耦合系统。结果表明，通过量子点与三棱柱金纳米阵列之间的强耦合效应以及无阻尼的LSPs的高散射效率，可以从CdSe/ZnS量子点获得更大的6倍发射增强因子。这可归因于系统中TaO层的匹配条件和低消光系数以及几乎无阻尼吸收。Γ的辐射散射率可以对自发发射率Γ做出贡献，从而提高量子点的内量子产率。这种策略对于金属修饰的荧光增强的实际应用可能很有前景。
