Cd1-xZnxS／SiO2介孔组装体系的光学性质

Optical Properties of Cd_(1-x)Zn_xS/SiO_2 Assembly Systems

利用sol-gel法得到SiO2介孔固体,浸泡热分解后获得Zn不同质量分数的Cd1-xZnxS/SiO2介孔组装体.吸收光谱表明,随着x的增加,吸收边向短波方向移动,这是由于Zn离子进入CdS取代了Cd离子,使Cd1-xZnxS能隙增大所致.由于量子尺寸效应,荧光光谱中发光峰的宽化现象较明显,同时发光强度随x增大而增强,这是由于Zn离子使α相比例减少而有利于发光所致.

Monolithic mesoporous silica was prepared by a sol-gel method from which the Cd1-XZnxS/SiO2 assembly systems with different doping concentrations of Zn ions were obtained by thermal reaction after immersing and drying. The measurements of optical absorption indicate that the optical absorption edge shifts to a short wavelength with increasing the concentration of Zn ion. It is suggested that the energy gap of CdS is enlarged with the Cd ion substituted by the Zn ion. The photoluminescence （PL） emission band is broadened, which is attributed to the effect of ions, which should be ascribed to quantum size. The PL intensity is increased with the increasing of doped Zn the decreasing of α-phase and benefits to the emission.