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Symmetrically Configured AC Light-Emitting (Scale) Devices: Generalizations and Variations

Published online by Cambridge University Press:  10 February 2011

Y. Z. Wang,
D. D. Gebler,
A. J. Epstein,
H. L. Wang,
T. M. Swager and
A. G. Macdiarmid
Y. Z. Wang
Affiliation:
Department of Physics, The Ohio State University, Columbus, OH 43210-1106
D. D. Gebler
Affiliation:
Department of Physics, The Ohio State University, Columbus, OH 43210-1106
A. J. Epstein
Affiliation:
Department of Physics, The Ohio State University, Columbus, OH 43210-1106
H. L. Wang
Affiliation:
Department of Chemistry, University of Pennsylvania, Philadelphia, PA 19104-6323
T. M. Swager
Affiliation:
Department of Chemistry, University of Pennsylvania, Philadelphia, PA 19104-6323
A. G. Macdiarmid
Affiliation:
Department of Chemistry, University of Pennsylvania, Philadelphia, PA 19104-6323
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Abstract

Most conjugated polymer-based light-emitting devices have been shown to be tunnel diodes which can only operate under forward DC driving field. Recently we have reported the fabrication of symmetrically configured AC light-emitting (SCALE) devices based on heterocyclic aromatic conjugated polymers. By adding an “insulating” layer (e.g. emeraldine base (EB) form of polyaniline) on both sides of the emitting layer, the SCALE devices emit light under both forward and reverse DC bias as well as AC driving voltage. The SCALE device structure ITO/J/emitterFl/M, has been shown to be quite general, and can be applied to a variety of electroluminescent polymers (emitter), insulating polymers (I) and electrode materials (M). Here we summarize and compare the performance of SCALE devices fabricated with different emitter, insulator, and electrode materials. The role of the insulating layer in the SCALE device operation is examined and a model that emphasizing the interface states is proposed to account for the device operation.

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References

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