Utilize este identificador para referenciar este registo:
https://hdl.handle.net/1822/3370
Título: | Mesoscopic modelling of bipolar charge Evolution in CN-PPV LEDs |
Autor(es): | Ramos, Marta M. D. Correia, Helena M. G. Ribeiro, R. M. |
Palavras-chave: | Mesoscopic modelling Charge distribution Recombination efficiency CN-PPV LED |
Data: | Dez-2004 |
Editora: | Elsevier 1 |
Revista: | Synthetic Metals |
Citação: | "Synthetic Metals". ISSN 0379-6779. 147:1/3 (Dez. 2004) |
Resumo(s): | Since various chances are possible in the molecular structure of the repeat unit, substituted poly(para-phenylenevinylene) (PPV) has ben used as active component in light-emitting diodes (LEDs) to obtain light emission in a wide range of colours. A major aspect determining device performance is the competition between current flow, trapping and recombination within the polymer layer. By suitable Monte Carlo calculations, we have performed computer experiments in which bipolar charge carriers are injected at constant rate in polymer networks made of cyano-substituted PPV chains with variable length and orientation. The intra-molecular electronic properties used in these simulations were calculated by a quantum molecular dynamics method. In order to assess the influence of cyano-substitution on the properties of single-layer PPV LEDs, we have focused our attention on bipolar charge evolution in time. Specifically addressed are the differences in electric field strength needed for intra-molecular charge mobility of electrons and holes and their consequences at mesoscopic scale. |
Tipo: | Artigo |
URI: | https://hdl.handle.net/1822/3370 |
DOI: | 10.1016/j.synthmet.2004.05.032 |
ISSN: | 0379-6779 |
Versão da editora: | www.elsevier.com |
Arbitragem científica: | yes |
Acesso: | Acesso aberto |
Aparece nas coleções: | CDF - FCT - Artigos/Papers (with refereeing) |
Ficheiros deste registo:
Ficheiro | Descrição | Tamanho | Formato | |
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repos-A34.pdf | SM147 | 163,57 kB | Adobe PDF | Ver/Abrir |