CdSe/ZnS量子点光谱吸收截面和辐射截面的确定

Determination of spectrum absorption and emission cross-sections of CdSe/ZnS quantum dot

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530nm和615nm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 cross- sections of quantum dots （QDs） is presented in this paper. In this method, the absorption cross- sections 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.