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Single-component light-emitting electrochemical cell with improved stability

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6 Author(s)
Edman, L. ; Center for Polymers and Organic Solids, University of California at Santa Barbara, Santa Barbara, California 93103 ; Pauchard, M. ; Liu, B. ; Bazan, G.
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We report a single-component polymeric light-emitting electrochemical cell with poly[9,9-bis[6-(N,N,N-trimethylammonium)hexyl]fluorene-alt-co-phenylene]bromide (PFN+Br-) as the active material. Indium tin oxide/PFN+Br-/aluminum sandwich structures demonstrate a low and thickness-independent turn-on voltage (2.9 V) for blue light emission. Thermophysical characterization shows that PFN+Br- is in a metastable amorphous phase after spin casting, but that crystallization takes place at elevated temperatures. With this information at hand, we allowed devices to turn-on via ionic redistribution (and the formation of a p–i–n junction) in the amorphous phase, and then stabilized this desired configuration through crystallization. We find significantly improved lifetimes and relatively fast turn-on times for these single-component devices operating at room temperature. © 2003 American Institute of Physics.

Published in:

Applied Physics Letters  (Volume:82 ,  Issue: 22 )

Date of Publication:

Jun 2003

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