Structural dependence of MEH-PPV chromism in solution.

Resumo
The chromism observed in the MEH-PPV polymer in tetrahydrofuran (THF) solution is discussed as a function of the structural morphology of the backbone chains. To evaluate this phenomenon, we carried out simulations employing a hybrid methodology using molecular dynamics and quantum mechanical approaches. Our results support the hypothesis that the morphological order– disorder transition is related to the change from red to blue phase observed experimentally. The morphological disorder is associated with total or partial twisted arrangements in the polymer backbone, which induces an electronic conjugation length more confined to shorter segments. In addition, the main band of the MEH-PPV UV–Vis spectrum at the lower wavelength is related to the blue phase, in contrast to the red phase found for the more planar backbone chains.
Descrição
Palavras-chave
Organic semiconductor, Molecular dynamics simulation, Organic electronics
Citação
MAGALHÃES, C. E. T. de et al. Structural dependence of MEH-PPV chromism in solution. Journal of Molecular Modeling, v. 23, p. 2-5, 2017. Disponível em: <https://link.springer.com/article/10.1007%2Fs00894-017-3239-6>. Acesso em: 16 jan. 2018.