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Science 25 August 1995:
Vol. 269. no. 5227, pp. 1086 - 1088
DOI: 10.1126/science.269.5227.1086
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Articles

Polymer Light-Emitting Electrochemical Cells

Qibing Pei 1, Gang Yu 1, Chi Zhang 1, Yang Yang 1, and Alan J. Heeger 1

1 UNIAX Corporation, 6780 Cortona Drive, Santa Barbara, CA 93117, USA.

A device configuration for light emission from electroactive polymers is described. In these light-emitting electrochemical cells, a p-n junction diode is created in situ through simultaneous p-type and n-type electrochemical doping on opposite sides of a thin film of conjugated polymer that contains added electrolyte to provide the necessary counterions for doping. Light-emitting devices based on conjugated polymers have been fabricated that operate by the proposed electrochemical oxidation-reduction mechanism. Blue, green, and orange emission have been obtained with turn-on voltages close to the band gap of the emissive material.

Submitted on May 18, 1995
Accepted on July 11, 1995


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