光学学报, 2017, 37 (1): 0130001, 网络出版: 2017-01-13
PbS量子点光致荧光寿命的实验测量与确定 下载: 767次
Experimental Measurement and Determination of Photoluminescence Lifetime of PbS Quantum Dots
光谱学 PbS量子点 荧光寿命 粒径 温度 spectroscopy PbS quantum dots photoluminescence lifetime particle size temperature
摘要
通过测量PbS量子点的吸收谱、时间分辨的荧光谱以及透射电子显微镜图, 确定了不同粒径、不同温度、不同本底PbS量子点的光致荧光寿命, 得到了描述第一吸收峰波长随量子点粒径变化的经验公式。结果表明, 荧光寿命强关联于量子点粒径, 可用负指数经验公式表达; 荧光寿命弱依赖于温度; 本底材料由于表面极化效应对荧光寿命也有影响。
Abstract
The photoluminescence (PL) lifetimes of PbS quantum dots (QDs) with different sizes, temperatures, and backgrounds are determined by the measurements of absorption spectra, time-resolved PL spectra, and transmission electron microscopy (TEM) images of PbS QDs. An empirical formula describing the variation of the first absorption-peak wavelength with QD size is obtained. The results indicate that the PL lifetime is strongly correlated to QD size in a way of negative exponential-dependence; the lifetime is weakly dependent on temperature; background material can affect the lifetime due to the surface-polarization effect.
程成, 李婕婕. PbS量子点光致荧光寿命的实验测量与确定[J]. 光学学报, 2017, 37(1): 0130001. Cheng Cheng, Li Jiejie. Experimental Measurement and Determination of Photoluminescence Lifetime of PbS Quantum Dots[J]. Acta Optica Sinica, 2017, 37(1): 0130001.