多孔氧化铝薄膜中罗丹明6G光学特性随光照时间的变化  

Changes of optical properties of Rhodamine 6G induced by illumination time in anodized aluminum oxide films

作　　者：孙立萍[1] 李玉栋[1] 齐继伟[1] 许京军[1] 孙骞[1] 

机构地区：[1]南开大学教育部弱光非线性光子学材料与器件重点实验室,天津300457

出　　处：《光电子．激光》2011年第6期864-867,共4页Journal of Optoelectronics·Laser

基　　金：国家重点基础研究发展计划资助项目(2007CB307001);国际科技合作重点项目计划资助项目(2005DFA10170);国家自然科学基金资助项目(60408006;60978020);中央高校基本科研业务费专项资金资助项目;天津市自然科学基金资助项目(06TXTJJC13500)

摘　　要：实现了有机染料-无机载体复合材料中J聚合物向H聚合物的转变,并且证明了泵浦激光能够导致复合材料的荧光淬灭效应。研究了多孔氧化铝(AAO)薄膜中的罗丹明6G(Rh6G)分子在激光泵浦下的吸收谱和荧光谱随照射时间不同而产生的变化。结果显示,随着照射时间的增加,吸收谱和荧光谱的峰位均发生了不可逆的蓝移,并且发生了荧光淬灭现象。数值模拟结果显示,荧光谱的峰值强度随时间变化符合两个自然指数衰减函数之和。发生这样的荧光强度衰减(即荧光淬灭)现象是因为样品中的单体与发射性J聚合物转变为非发射性的H聚合物。实验结果显示,这种聚合物的转变不是源于激光的热效应,其源于激光的光效应。The conversion of J-aggregates to H-aggregates in composite materials （organic dye-inorganic substrate） was firstly obtained in the experiment.We also observed that the laser illumination can lead to fluorescence quenching in composite materials.The temporal changes in spectra of highly ordered nanocomposite arrays（Rh6G-AAO） induced by laser illumination,which are formed by filling anodized aluminum oxide（AAO） with Rhodamine 6G（Rh6G） dyes,were studied by visible absorptive and fluorescent spectroscopy.Both the temporal absorption and fluorescence spectra of Rh6G-AAO illuminated by laser present irreversible blue shifted peak positions and diminished peak intensities（fluorescent quenching）.The numerical simulation results show that the temporal behavior of fluorescence peak intensities obes two exponential decay functions.The decay process,called fluorescent quenching,is contributed to the conversion of monomers and emissive J-aggregates into nonemissive H-aggregates.The experimental results show that the heat effect of laser can not induce the aggregate conversion.The photo-assisted effect of laser introduces the aggregate conversion of Rh6G molecules in AAO.

关 键 词：激光照射 多孔氧化铝(AAO) 罗丹明6G(Rh6G) 光谱 

分 类 号：O433.1[机械工程—光学工程]