CdS／SiO2介孔组装体系的光学性质

Optical properties of CdS/SiO_2 mesoporous assembly

溶胶-凝胶法获得多孔SiO2载体,用氮气等温吸附对其结构进行了评估.经浸泡热合成得到复合量不同的CdS/SiO2块体介孔组装体系,并研究了其光学性质.结果表明:随复合量减小,吸收边以及荧光谱中峰位向短波方向移动;退火温度升高后,发光强度增大,450℃以后开始减慢,这归因于缺陷和跃迁几率的竞争.

Monolithic mesoporous silica was prepared by sol-gel technique and the structure was examined by Nitrogen sorption isotherms measurement. The CdS/SiO2 assembly systems with different CdS loading were obtained by immersing, drying and thermal reaction. The optical properties of the CdS/SiO2 were investigated. It is found that the optical absorption edges and the peaks of fluorescence spectrum have a blue-shift with decreasing of CdS loading concentration. Photoluminescence intensity enhances along with the increase of the annealing temperature and slows down for the samples annealed at temperature above 450 ℃, which can be attributed to the result of comparison between the defaced quantity and transitional probability.