【摘要】 对掺有镉、硒、硫的玻璃在 6 5 0— 80 0℃退火 4h ,生长了不同尺寸的CdS0 1 3Se0 87纳米晶体 ,测量了纳米晶体的吸收光谱、光致发光 (PL)谱和电调制光谱 ,确定了纳米晶体部分电子态的能量 ,讨论了CdSSe纳米晶体的光学性质与其尺寸之间的依赖关系 .随着纳米晶体尺寸的增大 ,对应激子的吸收峰、PL峰及电吸收信号发生红移 ,表现出明显的量子尺寸效应 .小尺寸纳米晶体的电吸收表现为量子受限的Stark效应 ,而大尺寸纳米晶体的电吸收线形与体材料的相似 ;随着纳米晶体尺寸的增大 ,电吸收信号增强 .所有尺寸的纳米晶体都表现出三阶非线性更多还原

【Abstract】 CdS 0 13 Se 0 87 nanocrystals of different sizes were grown by annealing glass contained Cd,Se and S at 650—800℃ for 4?h. The absorption spectra, photoluminescence spectra and electroabsorption spectra of the nanocrystals were measured. The energy of part of the electronic states was determined. Dependence of the optical properties of nanocrystals on their size was discussed. With the increase of nanocrystal size, the absorption, photoluminescence and eletroabsorption shifted red due to the weakening of quantum size Stark effects. The electroabsorption of small nanocrystals was due to the quantum confined Stark effects whereas the electroabsorption line shape of larger nanocrystals was similar to that of bulk materials. With the increase of nanocrystal size, the electroabsorption is enhanced. All nanocrystals have the third\|order optical susceptibility.更多还原