以正硅酸乙酯为原料, 采用溶胶-凝胶法制备了Eu3+掺杂的SiO2凝胶和Eu3+/CdS量子点共掺杂的SiO2干凝胶。考察了不同温度下处理2 h对Eu3+掺杂SiO2凝胶发光性质的影响。 在40 ℃干燥的样品荧光光谱中, 没有出现614 nm发射峰, 455 nm处的峰也很弱; 随着干燥处理温度的升高, 455 nm和614 nm处的发射逐渐增强; 当温度高于400 ℃后, 强度又都随之下降。同时, 还考察了200 ℃条件下处理2 h的Eu3+/CdS量子点共掺杂的SiO2干凝胶的发光性质及CdS量子点对Eu3+荧光的影响。

Silica xerogels doped with Eu3+ ions and co-doped with Eu3+/CdS nanoparticles were prepared through a two-step hydrolysis process. The effect of annealing temperature on photoluminescence properties of Eu3+-doped silica xerogel was investigated. The results showed that the photoluminescence intensity of Eu3+-doped silica xerogels was significantly dependent on the annealing temperature, which was closely related to the amount of the defect in xerogel network. The emission intensity increased with the annealing temperature from 40 ℃ to 300 ℃ . But when the temperature exceeded 300 ℃, the intensity decreased with the annealing temperature. The study of the photoluminescence of co-doped xerogels showed that the intrinsic emissions due to 5D0→7FJ transitions of Eu3+ were observed, and the intensity was sensitive to the surface states of CdS particles and of the porous silica gel.