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Charge transport and recombination in polyspirobifluorene blue light-emitting diodes

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Author: Nicolai, H.T. · Hof, A. · Oosthoek, J.L.M. · Blom, P.W.M.
Type:article
Date:2011
Source:Advanced Functional Materials, 8, 21, 1505-1510
Identifier: 461476
Keywords: charge Transport · conjugated polymers · organic light-emitting diodes · Blue light-emitting · Charge transport · Charge transport and recombination · Electron currents · Hole transports · Measurement techniques · Numerical simulation · Polyspirobifluorene · Recombination zones · Space-charge limited · Steady-state currents · Transient electroluminescence · Conjugated polymers · Diodes · Light · Light emission · Light emitting diodes · Organic polymers · Power quality · Organic light emitting diodes (OLED) · Industrial Innovation · Mechatronics, Mechanics & Materials · HOL - Holst · TS - Technical Sciences

Abstract

The charge transport in blue light-emitting polyspirobifluorene is investigated by both steady-state current-voltage measurements and transient electroluminescence. Both measurement techniques yield consistent results and show that the hole transport is space-charge limited. The electron current is found to be governed by a high intrinsic mobility in combination with electron traps. Numerical simulations on light-emitting diodes reveal a shift in the recombination zone from the cathode to the anode with increasing bias. Copyright © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.