Yb^(3+)/Tm^(3+)共掺的硅酸盐玻璃上转换发光性能

Up-conversion Luminescence Properties of Yb^(3+)/Tm^(3+) Co-doped Silicate Glasses

采用高温熔融法制备了掺杂不同比例Yb^(3+)和Tm^(3+)的硅酸盐玻璃。吸收光谱表明,Yb^(3+)和Tm^(3+)在300~1 100 nm的吸收过程彼此不干扰。研究了玻璃样品在980 nm LD泵浦下的上转换发光行为,结果表明:Yb^(3+)/Tm^(3+)在477 nm(1G4→3H6)发射强烈的上转换蓝光,在654 nm(1G4→3F4)发射较弱的红光,在795 nm(3H4→3H6)发射微弱的红外光。提高Yb^(3+)的比例均能够提高477 nm蓝光、654 nm红光和795 nm红外光的发射强度。研究分析了上转换发光强度与激光器泵浦功率之间的关系,结果表明上转换蓝光和红光发射均为三个光子过程,红外光发射为两个光子过程。分析了Yb^(3+)、Tm^(3+)在硅酸盐玻璃中上转换发光的机制。

Silicate glasses with different ratio of Yb（3＋）and Tm（3＋）were prepared by high temperature melting method. Absorption spectra show that the absorption process of Tm（3＋）and Yb（3＋）in 300-1 100 nm are not disturbed by each other. Up-conversion luminescence of the glass sample under980 nm LD was studied. The results show that Yb（3＋）,Tm（3＋）launches strong up-conversion blue light at 477 nm（1G4→3H6）,but the emission of red light 654 nm（1G4→3F4） and 795 nm（3H4→3H6）infrared light are all weak. Improving the ratio of Yb（3＋）can improve the emission intensity of 477 nm blue,654 nm red and 795 nm infrared. The relationship between the intensity of up-conversion luminescence and the pump power of the laser was studied. The conversion of blue and red emission are three photon processes,and the infrared emission is two photon processes. Finally,the mechanization of Yb（3＋）and Tm（3＋）in the transformation of the silicate glass was analyzed.