CdSe/ZnS量子点光谱吸收截面和辐射截面的确定

摘要

提出了一种确定量子点吸收和辐射截面的简单和准确的方法.该方法根据Lambert-Beer定律,通过测量量子点的吸收谱确定吸收截面.然后,通过测量发射光谱,并与吸收谱作归一化处理,根据Mc Cumber理论来确定辐射截面.实际计算了辐射峰分别位于530 nm和615 nm的两种尺寸CdSe/ZnS量子点的吸收和辐射截面随波长的变化.这些光谱截面数据对CdSe/ZnS掺杂的光纤放大器和光纤激光器有重要的意义.%A simple and accurate method to determine spectrum absorption and emission crosssections of quantum dots (QDs) is presented in this paper.In this method,the absorption crosssections are determined according to Lambert-Beer's law and the measured first absorption spectra of the QD.Then,the emission cross-sections are determined by using the Mc Cumber theory and normalizing both the measured absorption and emission peaks.As an example,the cross-sections of CdSe/ZnS QDs in two sizes are obtained,one of which the emission peak locates at 530 nm,and another at 615 nm.The obtained cross-sections are available for investigating gain and excited radiation of quantum dots and configuring QD optoelectronic devices in the future.