Microcavity Effect in a Light-emitting Device Based on PPV Having a Oxidazole Moiety.

초록

Electroluminescent polymers have attracted considerable attention due to possible applications as large-area light-emitting displays. There have been many efforts to improve the electroluminescent efficiency. To design the polymer with high efficiency, it is necessary to understand the luminescent mechanism. In this report, we have studied the luminescent property in the microcavity which was formed by a single layer of OxdEh-PPV sandwiched between a metal mirror and a distributed-feedback mirror. Compared with the photoluminescence spectrum of a Al/OxdEh-PPV/glass structure made using a glass plate instead of a DFB mirror, we obtained the emission enhancemebt showing a higher PL and a narrower linewidth. The experimental results were compared with theoretical simulations based on an optical transfer matrix formalism. A DFB mirror was prepared by evaporatingTiO2 and SiO2 layers alternatively onto the glass plate. The numbers of layers are 6 or 7. The luminescent polymer was a poly(phenylenevinylene) derivative with an alkoxy and oxadiazole group as pendant(OxdEh-PPV).