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Proceedings Paper

Simulation of organic light-emitting diodes
Author(s): Christopher David James Blades; Alison B. Walker
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Paper Abstract

We present a study of electrical transport in organic light emitting diodes using a 1D drift diffusion model. This model includes bipolar transport, charge injection and electron trapping on the same footing. As input we have mobilities, doping densities typical of organic semiconducting devices, and barrier heights taken from internal photoemission measurements. Charge density, trap filling, field, potential and recombination profiles in addition to current-voltage characteristics are provided by the mode. We have obtained result for two-layer organic devices, examining the influence of contacts and of traps on the current-voltage characteristic. The density of filled traps is determined by the position of the quasiFermi level with respect to the trap energy levels, and this changes with position and applied bias. The quasiFermi level profile is sensitive to both the type of contact and the doping density. Traps at a single energy level, and with exponential distributions with respect to discrete energy levels have been considered. We see an injection limited current at low biases and bulk limited transport at higher biases with a trap limited current contribution.

Paper Details

Date Published: 18 May 1999
PDF: 10 pages
Proc. SPIE 3623, Organic Photonic Materials and Devices, (18 May 1999); doi: 10.1117/12.348411
Show Author Affiliations
Christopher David James Blades, Univ. of Bath (United Kingdom)
Alison B. Walker, Univ. of Bath (United Kingdom)

Published in SPIE Proceedings Vol. 3623:
Organic Photonic Materials and Devices
Bernard Kippelen, Editor(s)

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