金属局域等离激元调控量子点表面态发光的机制研究

项目名称： 金属局域等离激元调控量子点表面态发光的机制研究

项目编号： No.11504138

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 数理科学和化学

项目作者： 胡炼

作者单位： 江南大学

项目金额： 21万元

中文摘要： 半导体量子点表面态发光源于表面态电子能级关联的辐射跃迁过程，对表面态发光的表征与调制有助于理解量子点表面态相关的物理机制。本项目拟以II-VI族胶体量子点-贵金属（金、银）纳米结构耦合体为主要研究对象，在制备高质量的量子点和金属纳米结构的前提下，以不同结合方式形成发光特性可调的量子点-金属耦合体，通过研究金属局域等离激元增强量子点表面态发光的作用，构建相应的激子-等离激元共振耦合模型，解释金属局域等离激元作用下量子点-金属耦合体中独特的激子动力学过程，包括表面态与金属局域等离激元的共振机制、带边激子与表面态之间的能量转移过程，以及辐射复合和非辐射复合的变化，进而加深理解激子-等离激元相互作用的普遍机制与表面态之于量子点发光的物理角色。探索物理方法调控量子点发光的途径，并研究可调控表面态发光的量子点-金属耦合体的电致发光效应。

中文关键词： 量子点；局域等离激元；表面态；能量转移；非辐射复合

英文摘要： Surface-state related emission of semiconductor quantum dots arises from the optical transitions of surface states located in the bandgap. Characterizing and tuning the surface state emission can help understand the mechanism of the surface states. In this project, the high quality II-VI quantum dots and metal nanostructures such as gold and silver will be prepared. Several kinds of quantum dots-metal coupler with plasmon-enhanced surface state emission will be constructed. How localized plasmons in metal enhance surface state emission in quantum dots-metal coupler will be systematically researched and the corresponding exciton-plasmon coupling model will be built. The model can explain the special exciton dynamics in the coupler, including how the localized plasmons influence the energy transfer from band edge excitons to surface state excitons and how localized plasmons suppress the nonradiative recombination. The plasmon-modified exciton dynamics can help research the universal mechanism of exciton-plasmon interaction and the physical role of surface states. The electroluminescence effect based on the color-tunable quantum dots-metal coupler will be studied.

英文关键词： quantum dot;localized plasmon;surface state;energy transfer;nonradiative recombination