15 September 1995 Five-layered symmetrically configured ac light-emitting (SCALE) devices and their three-layered variations: use of gold as an electron and hole injection electrode
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Abstract
Symmetrically configured ac light-emitting (SCALE) devices based on conjugated polymers utilizing indium-tin oxide (ITO) and aluminum as electrodes have been demonstrated recently. Here we report the fabrication of SCALE devices using a more stable high workfunction metal, such as gold, as a charge (both electron and hole) injection electrode. Also, a variation of such devices in which the electroluminescent polymer, instead of being separated from the insulating polymer, is dispersed in the insulating polymer to form a unified emitter-insulator is reported. These devices emit light in both forward and reverse dc bias with symmetric current- voltage characteristics. Under low frequency ac (sinusoidal) driving voltage, light pulses with double the driving frequency are observed. A model is proposed to account for the device operation.
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Yunzheng Wang, Darren D. Gebler, James W. Blatchford, Scott W. Jessen, L. B. Lin, Terry L. Gustafson, Hsing-Lin Wang, Y. W. Park, Timothy M. Swager, Alan G. MacDiarmid, Arthur J. Epstein, "Five-layered symmetrically configured ac light-emitting (SCALE) devices and their three-layered variations: use of gold as an electron and hole injection electrode", Proc. SPIE 2528, Optical and Photonic Applications of Electroactive and Conducting Polymers, (15 September 1995); doi: 10.1117/12.219560; https://doi.org/10.1117/12.219560
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KEYWORDS
Polymers

Electrodes

Gold

Aluminum

Electroluminescence

Light emitting diodes

Interfaces

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