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External electric field effects on photochemical dynamics

外部电场对光化学动力学的影响

基本信息

批准号：
10440163
负责人：
OHTA Nobuhiro
金额：
$ 8万
依托单位：
HOKKAIDO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 1999
项目状态：
已结题

项目摘要

Methylene-linked compounds composed of carbazole, pyrene or phenanthrene and terephthalic acid metyl ester or dimethyl aniline are doped in a polymer film, and electrofluorescence spectra have been measured in order to examine the field effects on initial step of photoinduced electron transfer, back electron transfer and charger recombination processes. Multi-stacking layer films where interlayer photoinduced electron transfer occurs with a definite direction have been also prepared using mixed LB monolayer composed of oxacarbocyanine and arachidic acid as an electron donor and mixed LB monolayer composed of viologen and arachidic acid as an acceptor. Electric field effects on absorption spectra as well as on nuorescence spectra of these LB films have been examined with different spacer layers of fatty acid between oxacarbocyanine and viologen layers to examine the field effects on photoinduced electron transfer process and its donor-acceptor distance dependence. Excimer fluorescence of pyrene and pyrene linked compounds is found to be well affected by an electric field. The field dependence of the excimer fluorescence of the linked compounds of pyrene is much larger than that where pyrene molecules are distributed in a film randomly. The efficient field dependence of the excimer fluorescence of pyrene is found to be closely related to the efficient generation of elelctroluminescence. Electric field effects on fluorescence decay profile were also examined using the linked compounds composed of carbazole and terephhtalic acid methyl ester.

将咔唑、芘或菲与对苯二甲酸甲酯或二甲基苯胺组成的亚甲基连接化合物掺杂在聚合物薄膜中，并测量了电荧光光谱，以研究场对光致电子转移、反向电子转移和电荷复合过程初始阶段的影响。采用氧杂羰花青和花生酸组成的混合LB单层作为电子供体，紫精和花生酸组成的混合LB单层作为受体，还制备了层间光致电子转移发生在确定方向的多层薄膜。通过氧杂羰花青层和紫精层之间不同的脂肪酸间隔层，研究了电场对这些LB膜的吸收光谱和核光光谱的影响，以检查场对光致电子转移过程的影响及其供体-受体距离依赖性。发现芘和芘连接化合物的准分子荧光受电场影响很大。芘连接化合物的准分子荧光的场依赖性比芘分子随机分布在薄膜中的场依赖性大得多。发现芘准分子荧光的有效场依赖性与电致发光的有效产生密切相关。还使用由咔唑和对苯二甲酸甲酯组成的连接化合物检查了电场对荧光衰减曲线的影响。