Abstract:

Monolithic mesoporous silica was prepared by a sol\|gel method from which the Cd_1-xZn_xS/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 quantum size. The PL intensity is increased with the increasing of doped Zn ions, which should be ascribed to the decreasing of   α\|phase and benefits to the emission. 

Key words: Cd_1-xZn_xS/SiO₂, mesoporous assembly; , absorption edge, photoluminescence