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Current-Voltage Characteristics of Single Layer Polymer Light Emitting Diodes Under High Intensity Electrical Excitation

Published online by Cambridge University Press:  10 February 2011

B. Ruhstaller ,
J.C. Scott ,
P.J. Brock  and
S.A. Carter
B. Ruhstaller
Affiliation:
Dept. of Physics, University of California, Santa Cruz, CA 95064
J.C. Scott
Affiliation:
Dept. of Physics, University of California, Santa Cruz, CA 95064
P.J. Brock
Affiliation:
IBM Almaden Research Center, San Jose, CA
S.A. Carter
Affiliation:
Dept. of Physics, University of California, Santa Cruz, CA 95064
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Abstract

We study the current-voltage characteristics of both double and single carrier polymer light emitting devices in the high intensity electrical excitation regime. Single layer devices are investigated with the orange-emitting MEH-PPV as the active polymer. Performing very low duty (≈0.001 %) pulsed electroluminescence measurements with electric fields up to 1*109 V/m, we observe for the hole-dominated devices a space charge limited current with a saturating mobility and a saturating external quantum efficiency of 1%. For double carrier devices, the current starts to saturate in the high-field regime, appoaching Ohmic-like behavior. We report current densities of 100 A/cm2and brightnesses of 7*105 cd/m2. The spectral features are monitored below the onset of degradation.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 561: Symposium F – Organic Nonlinear Optical Materials and Devices , 1999 , 185
Copyright
Copyright © Materials Research Society 1999

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References

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