芪盐LB多层膜的三维荧光谱分析

采用稳态、时间分辨荧光和三维荧光光谱技术研究了芪盐有机分子在溶液和芪盐/花生酸交替LB多层膜中的激发态的动力学特性.研究表明,芪盐分子在LB膜中形成H-聚集体,使得其荧光光谱发生蓝移.由于偶极间的相互作用使得聚集体的能级发生分裂,荧光衰减曲线可用双指数函数进行拟合.三维荧光谱发现随着衰减时间的推移,荧光峰逐渐向长波方向移动,不同波段具有不同的衰减驰豫时间.

Analysis of Three-Dimensional fluorescence spectra in stilbazolium salt Langmuir-Blodgett multilayers

Dynamical properties of stilbazolium salt (SS) exc it ed state in SS/arachidic acid alternate Langmuir-Blodgett (LB) multilayers have been studied by steady state, time-resolved fluorescence and three-dimensiona l fluorescence technique. stilbazolium salt molecules formed H-type aggregatio n leads to fluorescence spectra was blue-shifted from the original fluorescence spectra of monomeric molecules. The excited state of aggregates splits into two levels due to the molecular electric dipole interaction. The fluorescence decay line of LB sample could be fitted by bi-exponential model. The fluorescence pe a ks were shift to long wavelength direction with decay time traction in three-di mensional fluorescence spectra. And there is difference fluorescence lifetime in difference wavelength band.