多孔硅镶嵌C102的蓝绿发光特性

Property of the Blue-green Photoluminescence of Porous Si Embedded C102

利用多孔硅(PS)独特的微孔结构、非常大的比表面积、很强的吸附能力和灵敏的表面光学性质等特点,将激光染料香豆素102(C102)镶嵌在多孔硅中,得到多孔硅镶嵌C102的复合膜。研究复合膜的荧光特性,我们发现:镶嵌在多孔硅中的C102荧光光谱与其在无水乙醇溶液中的荧光光谱相似,主要呈现单体发光特性;通过比较镶嵌在不同孔隙率中的C102荧光光谱,得知镶嵌在不同多孔硅中的染料分子主要以同种形式存在。另外还发现,放置一段时间后的镶嵌复合膜,荧光强度明显增强,对称性提高,保留了激光染料发光的很多优点。多孔硅镶嵌C102的荧光特性展示了多孔硅在发展固体激光器方面有一定的应用,并为实现硅基蓝绿发光打开新的途径。

Due to the importance of blue-green luminescence of silicon basis in color display and integrated apparatus, people begin to pay attention to this scientific research. The emission wavelength of coumarin dyes lay over 420～580 nm, transmit eyeable blue-green fluorescence. Because this kind of dyes belongs to laser dyes, it has good performance of luminescence, such as: high luminescence efficiency, fast response rapidity, short duration etc, these performance are in favor of information transmission and collection. Using the speciality of porous silicon: the structure of particular nanoporous, the mortal surface area, the strong capacity of absorption, the sensitive characteristic of surface luminescence, coumarin 102(C102) was impregnated into porous silicon. In this way, the composite system of porous silicon embedded C102 was obtained.Porous silicon was obtained by electrochemistry, anodization was conducted at a constant current using a DC stabilized power and flow supply, the specimens were prepared and measured in the ambient air. It was found that the fluorescence spectra of C102 embedded in PS was similar to the fluorescence spectra of C102 in ethanol, and the symmetry of spectra was improved. It was also found that energy transfer occurred between impregnated dye and porous silicon, the photoluminescence of the embedded film had better stability and reserved excellent optic characteristic of laser dyes. The experimental results suggested that the porous silicon embedded C102 might be a better approach of realizing the blue-green photoluminescence on silicon basis.