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Proceedings Paper

Current-voltage characteristics of polymer light-emitting diodes
Author(s): Esther M. Conwell; Ming Wei Wu
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Paper Abstract

Conduction in pristine conjugated polymers is by polaron hopping between sites corresponding to conjugation lengths. The strong increase of current I with voltage V observed for both emission-limited and ohmic contacts is due in large part to mobility increase as increasing field makes it more possible to overcome internal barriers, such as energy differences between sites. For emission-limited contacts an additional source of nonlinear increase of I with increasing V is greater ability to escape return to the injecting electrode due to the image force. For ohmic contacts additional nonlinearity comes from space charge effects. We are able to fit I vs. V for electron or hole conduction is some poly(p-phenylene vinylene), PPV, derivatives with ohmic contacts for reasonable values of the parameters involved.

Paper Details

Date Published: 1 December 1997
PDF: 9 pages
Proc. SPIE 3148, Organic Light-Emitting Materials and Devices, (1 December 1997); doi: 10.1117/12.284177
Show Author Affiliations
Esther M. Conwell, Univ. of Rochester and Xerox Corp. (United States)
Ming Wei Wu, Univ. of Rochester (United States)

Published in SPIE Proceedings Vol. 3148:
Organic Light-Emitting Materials and Devices
Zakya H. Kafafi, Editor(s)

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