Postprint version. Published in Journal of Applied Physics, Volume 72, Issue 2, July 15, 1992, pages 564-568.
The definitive version is available at https://doi.org/10.1063/1.351834.
We report visible light emission from diodes made from poly(3-octylthiophene). Use of a soluble derivative of polythiophene allows fabrication of the light emitting diodes by casting the polymer film from solution with no subsequent processing or heat treatment required. The devices emit dim red-orange light with relatively low external quantum efficiencies, below 2.5×10−5 photons per electron at room temperature. Electrical characterization reveals diode behavior with rectification ratios greater than 102. The temperature dependence indicates that tunneling phenomena dominate the charge injection.
Electrical and Computer Engineering
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