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.
出处
《浙江工业大学学报》
CAS
2013年第3期332-337,共6页
Journal of Zhejiang University of Technology
基金
国家自然科学基金资助项目(60777023)
浙江省自然科学基金资助项目(Z407371)
关键词
量子点
吸收截面
发射截面
quantum dot
spectrum
absorption cross-section
emission cross-section