作　　者： ; ;

机构地区： 复旦大学物理学系三束材料改性国家重点实验室

出　　处： 《发光学报》 2000年第1期48-52,共5页

摘　　要： 采用稳态和时间分辨荧光研究了不同类型的 LB多层膜中分子聚集特性。在半花菁 /花生酸交替膜中 ,花生酸层的隔离使得半花菁分子之间的相互作用主要发生在同一层中 ,形成 H聚集体 ,荧光光谱蓝移 ;在纯半花菁 Y型和 Z型膜中 ,较强的层间相互作用使分子形成 J聚集体 ,导致荧光光谱发生显著红移。 Aggregation features of molecules in various types of Langmuir Blodgett (LB) multilayers were investigated by using the steady state and time resolved fluorescence techniques. The fluorescence peak of interleaving hemicyanine/arachidic acid multilayers is at 598nm which shows a significant blue shift with respect to that of hemicyanine(615nm) in solution. As the interlayer interactions were screened by arachidic acid layers, intralayer interaction of hemicyanine molecules caused the formation of H aggregates in interleaving hemicyanine/arachidic acid multilayers. However, the fluorescence peaks of pure Y and Z type hemicyanine multilayers are at 645nm and 635nm , respectively. It indicated that the molecules mainly formed J aggregates which lead to a significant red shift of fluorescence band due to the stronger interlayer interactions. It indicated that the interlayer interaction would be stronger than the intralayer interaction because of the lack of the screening of AA and the inclination angle θ would be reduced (close to 0), which caused J type aggregation. The temporal profile could be well fitted by the model. The lifetime, relative amplitudes of the components and molecular numbers in an aggregate were deduced, Notice that the molecular numbers and amplitudes of the aggregates in the pure hemicyanine samples were larger than that in LB interleaving films.

关 键 词： 膜 多层膜 聚集体 时间分辨荧光

领　　域： [理学] [理学]