Satoru Ohmori

Energy transfer and excimer formation in layered polymer films prepared by the Langmuir-Blodgett technique

Abstract Langmuir-Blodgett (LB) polymer films containing various kinds of chromophores have been prepared from a preformed polymer, poly(vinyl octal). The fluorescence properties, energy transfer and excimer formation in the layered structure have been investigated to elucidate the photophysical characteristics of polymer LB films. The built-up film exhibits no excimer emission even at high concentrations of chromophores. Efficient energy transfer takes place between neighbouring layers, and the transfer process can be controlled by the sequence and the spacing of the layers. This behaviour is attributed to the uniform distribution of chromophores and low thickness of the polymer LB film.

Uniform chromophore distribution in Langmuir–Blodgett films of poly(vinyl octanal acetal)

Uniform chromophore distribution in Langmuir–Blodgett (LB) monolayers has been attained using a preformed polymer, poly(vinyl octanal acetal), containing the pyrene chromophore as a fluorescence probe.

Triplet excimer formation in Langmuir-Blodgett polymer films of poly[2-(9-carbazolyl)ethyl methacrylate-co-isobutyl methacrylate]

Abstract The triplet state behavior of carbazole-containing polymer Langmuir-Blodgett films was investigated. The carbazole groups are localized at the hydrophobic part of the layered film and form a triplet excimer which is attributed to interlayer interaction at the interfaces between layers. The degree of interaction between carbazole chromophores in the triplet state is determined by the interchromophore distance.

ENERGY TRANSFER AND MIGRATION IN POLYMER LB FILMS

The LB films of poly(vinyl octal) that have chromophores show efficient interlayer energy migration and transfer. This phenomenon can be ascribed to the uniform distribution of the chromophores and the thinness of the LB films. These properties of polymer LB films can be utilized to design new photofunctional molecular assemblies. The interlayer energy transfer manifests structural relaxation of the layered structure of LB films.