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基于时间分辨光谱技术的ZnCuInS/ZnSe/ZnS量子点的激子弛豫动力学
李雪璁*,隋宁,张宇*
作者单位E-mail
李雪璁* 天津工业大学应用物理系天津 300387 lixcyy@163.com 
隋宁 吉林大学物理学院长春 130012  
张宇* 吉林大学电子科学与工程学院集成光电子学国家重点实验室长春 130012 yuzhang@jlu.edu.cn 
摘要:
通过时间分辨光谱技术详细地研究了ZnCuInS/ZnSe/ZnS量子点的激子弛豫动力学. 基于速率分布模型,波长依赖的发射动力学表明本征激子、界面缺陷态中的激子、给-受体对态中的激子都会参与量子点的发光过程,整个发光过程主要依赖于给-受体对态发射. 瞬态吸收数据表明激发后本征激子和界面缺陷物种可能会同时出现,在高激发光强下,光强依赖的俄歇复合过程也存在于量子点中
关键词:  量子点,时间分辨光谱,激子弛豫动力学
DOI:10.1063/1674-0068/28/cjcp1409143
分类号:
基金项目:
Investigation on Exciton Relaxation Kinetics of ZnCuInS/ZnSe/ZnS Quantum Dots by Time-Resolved Spectroscopy Techniques
Xue-cong Li*,Ning Sui,Yu Zhang*
Abstract:
The exciton relaxation kinetics of ZnCuInS/ZnSe/ZnS quantum dots (QDs) is investigated by time-resolved spectroscopy techniques in detail. Based on the rate distribution model, the wavelength-dependent emission dynamics shows that the intrinsic exciton, the exciton in the interface defect state and that in donor-acceptor pair state (DAPS) together participate in the photoluminescence process of QDs, and the whole emission process is mainly dependent on the DAPS emission. Transient absorption data show that the intrinsic exciton and the interface defect species maybe together appear after excitation and the intensity-dependent Auger recombination process also exists in QDs at high excitation intensity.
Key words:  Quantum dots, Time-resolved spectroscopy, Exciton relaxation kinetics