1. Light emission at 5V from a polymer device with a millimeter-sized interelectrode gap
- Author
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Agnieszka Iwasiewicz, Joon-Ho Shin, Steven Xiao, Andrzej Dzwilewski, Åke Fransson, Ludvig Edman, and Genesis Ngwa Ankah
- Subjects
Conductive polymer ,Materials science ,Physics and Astronomy (miscellaneous) ,business.industry ,Doping ,Analytical chemistry ,Photoelectrochemical cell ,Electrochemical cell ,Amorphous solid ,Optoelectronics ,Ionic conductivity ,Light emission ,business ,Visible spectrum - Abstract
We report the onset of electrochemical doping and subsequent visible light emission at 5V and 360K from a planar light-emitting electrochemical cell with a 1mm interelectrode gap containing poly[2-methoxy-5-(2′-ethyl-hexyloxy)-1, 4-phenylenevinylene] (MEH-PPV), poly(ethylene oxide) (PEO), and XCF3SO3 (X=K,Li) as the active material. We rationalize the unprecedented low turn-on voltage of such wide-gap light-emitting electrochemical cells by demonstrating that the active material contains a mixture of crystalline PEO+XCF3SO3 domains and amorphous MEH-PPV domains at room temperature, but that the crystalline domains have melted at 360K resulting in a significant increase in the ionic conductivity.
- Published
- 2006
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