温度对半花菁LB多层膜的光致荧光特性的影响

利用稳态荧光谱和时间分辨荧光技术研究了温度对半花菁Langmuir-Blodgett(LB)多层膜光致荧光特性的影响.半花菁分子在半花菁/花生酸、半花菁/花生酸镉交替及纯半花菁Z-型LB多层膜中均形成了H-聚集体,加热能使聚集体部分离解.由于Z-型膜中没有花生酸或花生酸镉的屏蔽,分子间具有较强的偶极相互作用,加热使聚集体的离解的程度较小.镉离子的加入对半花菁LB多层膜的稳态荧光谱也有一定的影响.

Influence of temperature on fluorescence properties in hemicyanine Langmuir-Blodgett multilayer films

Influence of temperature on fluorescence properties in hemicyanine Langmuir Blodgett(LB) multilayer films was investigated by using steady state and time resolved fluorescence techniques. The hemicyanine molecules all formed H type aggregates in the interleaving hemicyanine/arachidic acid or cadmium arachidate, and Z type pure hemicyanine multilayers. The H type aggregated could be dissociated by heating partially. The hemicyanine molecules have a strong interaction due to no screening of arachidic acid or cadmium arachidate layer. Therefore, the aggregates were dissociated less in the Z type pure hemicyanine LB multilayers than of that the interleaving hemicyanine/arachidic acid or cadmium arachidate LB multilayers. The steady state fluorescence was also influenced by the cadmium ion.