中文摘要：

通过溶胶–凝胶法制备xZnO–（100–x）SiO2（x=0,5,10,20,摩尔分数）玻璃,研究ZnO含量对Dy3＋发光强度的影响,并且研究Dy3＋在紫外光和飞秒激光激发下的发光特性。结果表明：当ZnO摩尔（下同）含量为0、5%和10%,Dy3＋的发光强度几乎不变,当ZnO含量达到20%时,Dy3＋的发光强度显著增强,归因于基质微结构的明显改变。研究了飞秒激光激发时,Dy3＋在ZnO–SiO2玻璃中的上转换发光特性。在飞秒激光（800nm）激发下,观察到强Dy3＋的上转换发光。Dy3＋的发光强度与泵浦光强度的依赖关系表明：上转换发光过程为双光子机制为主,根据Dy3＋的能级,Dy3＋在SiO2和ZnO–SiO2玻璃中的上转换发光的机制归因于激发态吸收。

英文摘要：

Glasses with the composition of xZnO–（100–x）SiO2 （x=0,5,10,20,mole ratio,the same below） were prepared by the sol–gel method. Effect of ZnO content on the luminescent intensity of Dy3＋ was studied. Moreover,the luminescent properties of Dy3＋ in ZnO–SiO2 glasses were investigated under the ultraviolet light and femtosecond （fs） laser （800 nm） excitation. The results indicate that the luminescent intensity of Dy3＋ hardly changes as ZnO content is 0,5% and 10%. When ZnO content increases to 20%,the luminescent intensity of Dy3＋ remarkably enhances,which can be attributed to the great changes of the host microstructures. The upconversion luminescence （UCL） properties of Dy3＋ in ZnO–SiO2 glasses were studied. Strong UCL of Dy3＋ in SiO2 and ZnO–SiO2 glasses was observed at fs laser excitation. The photoluminescent intensity of Dy3＋ as the fs laser pump power indicates that the two-photon absorption dominates the upconversion luminescence. According to the energy level analysis of Dy3＋,the UCL mecha-nism of Dy3＋ in both SiO2 and ZnO–SiO2 glasses is attributed to excited state absorption.