PbS量子点光致荧光寿命的实验测量与确定  

Experimental Measurement and Determination of Photoluminescence Lifetime of PbS Quantum Dots

作　　者：程成[1] 李婕婕 

机构地区：[1]浙江工业大学光电子智能化技术研究所,浙江杭州310023

出　　处：《光学学报》2017年第1期321-328,共8页Acta Optica Sinica

基　　金：国家自然科学基金(61274124;61474100)

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。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.

关 键 词：光谱学 PbS量子点 荧光寿命 粒径 温度 

分 类 号：O433.4[机械工程—光学工程]