Guli Mina, Chen Shijian, Zhang Dingke, Li Xiaotian, Yao Jianxi, Chen Lei, Xiao Li
Appl Opt. 2014 Jan 10;53(2):291-5. doi: 10.1364/AO.53.000291.
A mesoporous composite silica film loaded with organic dye has been successfully synthesized by a solgel reaction process and a simple postgrafting method at room temperature. The composite film was characterized by x-ray diffraction, transmission electron microscopy, UV-Vis, photoluminescence (PL) spectra, and laser performance, and the results confirmed the existence of dyes in the channels of the silica film. A blue-shift and fluorescence property in the PL spectrum was observed from the composite film compared with that of dye molecules in C₂H₅OH solution. The spectrum narrowing phenomena has been observed when the composite film is pumped at λp=355 nm by a Nd:YAG pulsed laser. A narrower, higher peak was observed in emission spectra from the mesostructured composite silica film compared with the PL spectrum of dye in C₂H₅OH solution. There is a substantial reduction in the full width at half-maximum of the emitting light, which results in peaks with linewidths of 26 nm or more. This collapse of the emission spectrum is one of the signatures of the presence of amplified spontaneous emission.
通过溶胶 - 凝胶反应过程和简单的室温后接枝方法，成功合成了负载有机染料的介孔复合二氧化硅薄膜。通过X射线衍射、透射电子显微镜、紫外 - 可见光谱、光致发光（PL）光谱和激光性能对复合薄膜进行了表征，结果证实了二氧化硅薄膜通道中存在染料。与染料分子在C₂H₅OH溶液中的情况相比，复合薄膜的PL光谱中观察到蓝移和荧光特性。当用Nd:YAG脉冲激光在λp = 355 nm处泵浦复合薄膜时，观察到光谱变窄现象。与染料在C₂H₅OH溶液中的PL光谱相比，介孔结构复合二氧化硅薄膜的发射光谱中观察到更窄、更高的峰。发射光的半高宽大幅减小，导致峰的线宽为26 nm或更宽。发射光谱的这种崩塌是放大自发发射存在的特征之一。
