10 November 2004 Light-emitting electrochemical cells for large-area lighting applications
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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, Rene T. Wegh, Eduard J. Meijer, Eduard J. Meijer, Edward A. Plummer, Edward A. Plummer, Luisa De Cola, Luisa De Cola, Klemens Brunner, Klemens Brunner, Addy van Dijken, Addy van Dijken, Johannes W. Hofstraat, 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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