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Manipulating the Local Light Emission in Organic Light-Emitting Diodes by using Patterned Self-Assembled Monolayers

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Author: Mathijssen, S.G.J. · Hal, P.A. van · Biggelaar, T.J.M. van den · Smits, E.C.P. · Boer, B. de · Kemerink, M. · Janssen, R.A.J. · Leeuw, D.M. de
Type:article
Date:2008
Source:Advanced Materials, 2703-2706
Identifier: 441298
doi: doi:10.1002/adma.200800299
Keywords: Electronics · Mechatronics, Mechanics & Materials · TS - Technical Sciences

Abstract

In organic light-emitting diodes (OLEDs), interface dipoles play an important role in the process of charge injection from the metallic electrode into the active organic layer.[1,2] An oriented dipole layer changes the effective work function of the electrode because of its internal electric field. The differences between the work functions of the electrodes and the highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) of the light-emitting polymer determine the injection barriers and, thus, the electron/hole current balance and light emission of an OLED.[3] Therefore, the local light emission can be enhanced or suppressed by changing the work function on a local scale. This control of local emission is ideally suited for OLED-based signage applications, for example.