Investigations of ultrafast dynamics in light-emitting polymers
Journal
Journal of the Chinese Chemical Society
Journal Volume
48
Journal Issue
3
Pages
641-649
Date Issued
2001
Author(s)
Abstract
Abstract A microscopic model is constructed to describe the excited states of MEH‐PPV in thin film. It is suggested that in the high energy region, the nature of excited states in the film is very similar to the species observed in solution phase. Moreover the processes of energy transfer, vibrational relaxation and dissipation are considered to occur simultanesously, in contrast to the usual argument that assumes exciton migration occurs after vibrational motion reaches thermal equilibrium. In the low energy region, corresponding to the red‐edge of absorption, the excited state behaves differently. We assume that there exists a low energy species due to the enhancement of coplanarity of polymers in thin film and the absorption spectrum can be fitted.
SDGs
Type
journal article