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Proceedings Paper

Light-emitting electrochemical cells for large-area lighting applications
Author(s): Rene T. Wegh; Eduard J. Meijer; Edward A. Plummer; Luisa De Cola; Klemens Brunner; Addy van Dijken; Johannes W. Hofstraat
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Paper Abstract

A light-emitting electrochemical cell is a type of organic electroluminescent device of particular interest for large-area lighting. We have assessed the potential applicability of different kinds of light-emitting electrochemical cells. For devices having a blend of an electroluminescent polymer and a polymer electrolyte as active layer, the obtainable efficiency and lifetime were found to be insufficient for practical applications. Light-emitting electrochemical cells with charged transition metal complexes as conducting and electroluminescent material sandwiched between ITO and Ag electrodes resulted in considerable improvement. For a yellow-emitting charged Ir complex, an efficacy of about 4 cd/A over a wide luminance range was obtained. Furthermore, we have studied the dependence of the performance on the active layer thickness, and we demonstrate that thick-layer light-emitting electrochemical cells can be operated at much lower voltage than organic light-emitting diodes.

Paper Details

Date Published: 10 November 2004
PDF: 11 pages
Proc. SPIE 5519, Organic Light-Emitting Materials and Devices VIII, (10 November 2004); doi: 10.1117/12.556819
Show Author Affiliations
Rene T. Wegh, Philips Research (Netherlands)
Eduard J. Meijer, Philips Research (Netherlands)
Edward A. Plummer, Philips Research (Netherlands)
Univ. of Amsterdam (Netherlands)
Luisa De Cola, Univ. of Amsterdam (Netherlands)
Klemens Brunner, Philips Research (Netherlands)
Addy van Dijken, Philips Research (Netherlands)
Johannes W. Hofstraat, Philips Research (Netherlands)
Univ. of Amsterdam (Netherlands)


Published in SPIE Proceedings Vol. 5519:
Organic Light-Emitting Materials and Devices VIII
Zakya H. Kafafi; Paul A. Lane, Editor(s)

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