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Light-Emitting Diodes with Voltage-Switchable Colors from Semiconducting Polymer/Polymer Heterojunctions

Published online by Cambridge University Press:  10 February 2011

Xuejun Zhang  and
Samson A. Jenekhe
Xuejun Zhang
Affiliation:
Departments of Chemical Engineering and Chemistry, University of Rochester, Rochester, New York 14627-0166
Samson A. Jenekhe
Affiliation:
Departments of Chemical Engineering and Chemistry, University of Rochester, Rochester, New York 14627-0166
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Abstract

Reversible electroluminescence color changes with applied voltage have been observed in light-emitting diodes fabricated from semiconducting polymer heterojunctions consisting of an electron transporting polybenzobisthiazole and hole transporting poly(p-phenylene vinylene) when layer thicknesses are less than 60–100 nm. Enhanced device performances such as lower turn-on voltage and higher efficiency and luminance were also obtained compared to single-layer devices. The observed voltage-switchable emission colors in these nanoscale heterojunction light sources can be understood in terms of spatial confinement effects which are related to field-dependent charge transport and trapping processes in the materials. These results also demonstrate the use of new high temperature rigid-rod polymers as electron transport and emissive layers in electroluminescent devices.

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Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 488: Symposium J – Electrical, Optical & Magnetic Properties of Organic IV , 1997 , 539
Copyright
Copyright © Materials Research Society 1998

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