Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 19, Issue 16, Pages 2671-2676Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.200900479
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Funding
- Vetenskapsradet
- Knut and Alice Wallenberg Foundation
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Polymer light-emitting electrochemical cells (LECs) offer an attractive opportunity for low-cost production of functional devices in flexible and large-area configurations, but the critical drawback in comparison to competing light-emission technologies is a limited operational lifetime. Here, it is demonstrated that it is possible to improve the lifetime by straightforward and motivated means from a typical value of a few hours to more than one month of uninterrupted operation at significant brightness (> 100 cd m(-2)) and relatively high power conversion efficiency (2 lm W-1 for orange-red emission). Specifically, by optimizing the composition of the active material and by employing an appropriate operational protocol, a desired doping structure is designed and detrimental chemical and electrochemical side reactions are identified and minimized. Moreover, the first functional flexible LEC with a similar promising device performance is demonstrated.
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