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Title
Separating Ion and Electron Transport: The Bilayer Light-Emitting Electrochemical Cell
Article in journal
Authors
Andreas Sandstrom, Piotr Matyba, Olle Inganäs, Ludvig Edman
Publication Year
2010
Source
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 2010, (132)19, 6646-+
Link to Source (DOI)
10.1021/ja102038e
Abstract
<p>The current generation of polymer light-emitting electrochemical cells (LECs) suffers from insufficient stability during operation. One identified culprit is the active material, which comprises an intimate blend between an ion-conducting electrolyte and an electron-transporting conjugated polymer, as it tends to undergo phase separation during long-term operation and the intimate contact between the ion- and electron-transporting components provokes side reactions. To address these stability issues, we present here a bilayer LEC structure in which the electrolyte is spatially separated from the conjugated polymer. We demonstrate that employing this novel device structure, with its clearly separated ion- and electron-transport paths, leads to distinctly improved LEC performance in the form of decreased turn-on time and improved light emission. We also point out that it will allow for the utilization of combinations of active materials having mutually incompatible solubilities.</p>