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测量了三种不同直径(4.5,5.0,5.6nm)的IV-VI族PbSe量子点的近红外吸收光谱,给出了吸收峰值波长随量子点直径变化的经验公式。用吸收光谱法,根据Lambert-Beer定律,测量了光谱的吸收截面峰值和吸收系数及其随波长和掺杂浓度的变化,发现吸收截面对掺杂浓度有弱相关性,得到了吸收截面随掺杂浓度变化的指数近似表达式。测量了量子点的荧光辐射谱,由McCumber关系和实测的吸收截面,确定了量子点光谱的辐射截面峰值及随波长的变化。这些光谱截面数据对PbSe量子点掺杂的增益型器件和传感器设计有重要的意义。
The near-infrared absorption spectra of three different diameters (4.5, 5.0, 5.6 nm) of the IV-VI PbSe quantum dots were measured, and the empirical formula of the absorption peak wavelength with the variation of the quantum dot diameter was given. Absorption spectroscopy, Lambert-Beer law according to the measured absorption peak of the absorption spectrum and the absorption coefficient and its wavelength and doping concentration changes and found that the absorption cross-section of the doping concentration has a weak correlation, the absorption cross section with the doped Exponential approximate expression of variation of impurity concentration. The fluorescence emission spectra of QDs were measured. Based on the McCumber relationship and the measured absorption cross section, the peak of the radiation cross section and the change with wavelength of the QDs were determined. These spectral cross-section data is of great importance to the design of gain devices and sensors that are doped with PbSe quantum dots.