CdS、ZnS毫微晶的光学吸收与尺寸效应

Optical absorption and size effect in CdS and ZnS microcrystallites

本文用高阶Mie散射理论研究了CdS、ZnS毫微晶的吸收(消光)光谱及其随微晶尺寸的变化,提出了在CdS、ZnS毫微晶半径大于～10nm时,吸收峰及吸收边的蓝移主要由经典尺寸效应所引起;在毫微晶半径小于～10nm时,吸收的蓝移主要是量子尺寸效应的贡献.

With high order Mie scattering theory, we studied the absorption (extinction) spectra, of colloidal CdS, ZnS microcrystallites, and the dependence of the apectra on crystallite size. It is predicted that the blue shifts of absorption peak and absorption edge are mainly caused by classical size effect at the microcrystallite radii of CdS, ZnS larger than 10 nm, otherwise, the blue shifts are mainly due to quantum size effect.