多孔硅后处理对其镶嵌染料光学特性的影响

对多孔硅进行真空退火处理和暴露大气快速退火处理,将有机染料香豆素102(C102)镶嵌其中,研究镶嵌复合膜发光特性的变化。通过比较多孔硅退火处理前、后傅立叶红外(FT-IR)吸收光谱的变化,从多孔硅与镶嵌染料分子间的能量传递方式角度出发,解释了PS表面态氧化能改善镶嵌复合膜发光特性的原因。实验通过改变多孔硅表面态,提高了复合膜的发光效率和多孔硅基体的透明程度,证明了多孔硅是一种良好的载体,在发展固体激光器方面有一定的应用,同时为实现硅基蓝绿发光开辟一条新的途径。

The Optical Characteristic of Organic Dye Embedded in Annealed Porous Silicon

Using the speciality of porous silicon,organic dye was impregnated into porous silicon in order to improve the luminescence of porous silicon and realize high luminescence efficiency on silicon basis.This problem had been researched,but the problem of energy transfer between porous silicon and organic dye was still under discussed.In this article,porous silicon was annealed diversely in vacuum and in atmosphere,then,C102 dyes were embedded into both PS samples.In this way,two different kinds of composite system of porous silicon embedded by C102 were obtained.By comparing the optical characteristic of these two kinds of composite system,it was found that the luminescence intensity of C102 embedded in PS was enhanced when porous silicon was annealed in atmosphere.By contrasting the FT-IR spectra of the two kinds of annealed porous silicon,it was found that the Si—H bonding was reduced and hanging-bonding was appeared in surface-state of porous silicon when porous silicon were annealed in vacuum.On the other hand,it was found that the surface-state of porous silicon was oxidized when porous silicon was annealed in atmosphere.The experimental results showed that the oxidized porous silicon could improve the luminescence efficiency of embedded films and improve the transparence of PS underlay.In terms of energy transfer between porous silicon and organic dyes,the oxidation of porous silicon’s surface-state could decrease nonradiation channels and hinder the energy transfer.Therefore,the optics characteristic of organic dyes embedded in porous silicon can be absolutely exposed.In this paper,it was realized luminescence of solid-state C102 and found that luminescence efficiency of these embedded films could be improved by changing surface-state of porous silicon.The results suggested that the porous silicon embedded C102 should be a better approach for realizing the blue-green photoluminescence on silicon basis.