Use este identificador para citar ou linkar para este item: https://locus.ufv.br//handle/123456789/21774
Tipo: Artigo
Título: Avoiding trap states in poly(n-vinylcarbazole) thin films
Autor(es): Valadares, M.
Calado, H. D. R.
Araujo, K. A. S.
Guimarães, P. S. S.
Cury, L. A.
Akcelrud, L.
Sanvitto, D.
Giorgi, M. de
Abstract: Optical properties of poly(n-vinylcarbazole) (PVK) thin films are revisited. Steady-state emission spectra put in evidence a strong red band whose intensity increases with decreasing temperature when the solid state PVK film is excited by a continuous 375 nm laser line. This red band is assigned to the emission from PVK aggregate states which act as trap states for the monomeric PVK triplet high energy (blue) excitons. At the same low temperatures, these trap states can be avoided when the excitation of the PVK film is made by a 355 nm pulsed laser line with 10 Hz repetition rate. The red band was also observed to compete with the emission of guest poly(3-octadecylthiophene) (PODT) molecules in a PVK/PODT sequential bilayer structure. Different optical geometries enabled us to show that the exciton energy transfer effect from PVK donor to PODT acceptor states dominates the scenario in the bilayer structure, suppressing almost completely the trap state emissions.
Palavras-chave: Triplet trap states
PVK
Aggregates
Exciton energy transfer
PVK/PODT adjacent bilayerpt-BR
Editor: Organic Electronics
Tipo de Acesso: Elsevier B.V.
URI: https://doi.org/10.1016/j.orgel.2012.08.034
http://www.locus.ufv.br/handle/123456789/21774
Data do documento: Dez-2012
Aparece nas coleções:Artigos

Arquivos associados a este item:
Arquivo Descrição TamanhoFormato 
artigo.pdf
  Until 2100-12-31
texto completo856,39 kBAdobe PDFVisualizar/Abrir ACESSO RESTRITO


Os itens no repositório estão protegidos por copyright, com todos os direitos reservados, salvo quando é indicado o contrário.