10 November 2004 Light-emitting electrochemical cells for large-area lighting applications
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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.
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Rene T. Wegh, Eduard J. Meijer, Edward A. Plummer, Luisa De Cola, Klemens Brunner, Addy van Dijken, Johannes W. Hofstraat, "Light-emitting electrochemical cells for large-area lighting applications", Proc. SPIE 5519, Organic Light-Emitting Materials and Devices VIII, (10 November 2004); doi: 10.1117/12.556819; https://doi.org/10.1117/12.556819
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