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Effect of molecular properties on the performance of polymer light-emitting diodes

Ramos, MMD; Almeida, AM; Correia, HMG; Ribeiro, RM; Stoneham, AM; (2004) Effect of molecular properties on the performance of polymer light-emitting diodes. Applied Surface Science , 238 (1-4 Sp) 438 - 443. 10.1016/j.apsusc.2004.05.168. Green open access

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Abstract

The performance of a single layer polymer light-emitting diode depends on several interdependent factors, although recombination between electrons and holes within the polymer layer is believed to play an important role. Our aim is to carry out computer experiments in which bipolar charge carriers are injected in polymer networks made of poly(p-phenylene vinylene) chains randomly oriented. In these simulations, we follow the charge evolution in time from some initial state to the steady state. The intra-molecular properties of the polymer molecules obtained from self-consistent quantum molecular dynamics calculations are used in the mesoscopic model. The purpose of the present work is to clarify the effects of intra-molecular charge mobility and energy disorder on recombination efficiency. In particular, we find that charge mobility along the polymer chains has a serious influence on recombination within the polymer layer. Our results also show that energy disorder due to differences in ionization potential and electron affinity of neighbouring molecules affects mainly recombinations that occur near the electrodes at polymer chains parallel to them. (C) 2004 Elsevier B.V. All rights reserved.

Type: Article
Title: Effect of molecular properties on the performance of polymer light-emitting diodes
Location: Badajoz, SPAIN
Open access status: An open access version is available from UCL Discovery
DOI: 10.1016/j.apsusc.2004.05.168
Publisher version: http://dx.doi.org/10.1016/j.apsusc.2004.05.168
Language: English
Additional information: Text made available to UCL Discovery by kind permission of Elsevier B.V., 2012
Keywords: modelling, charge mobility, recombination efficiency, conducting polymer, ELECTRONIC-PROPERTIES, MOBILITY, FILMS
UCL classification: UCL > School of BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology
URI: http://discovery.ucl.ac.uk/id/eprint/53166
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