DC-driven, sub-2 V solid-state electrochemiluminescent devices by incorporating redox coreactants into emissive ion gels

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Abstract

We demonstrate a DC-driven solid-state electrochemiluminescent (ECL) device based on a solution-processable ion gel containing luminescent complexes and tetrabutylammonium oxalate (TBAOX) as a coreactant. The ECL gel, comprising a polystyrene-block-poly(methyl methacrylate)-block-polystyrene copolymer, 1-ethyl-3-methylimidazolium bis (trifluoromethylsulfonyl)- imide ionic liquid, tris(2,2'-bipyridine)ruthenium(II) hexafluorophosphate (Ru(bpy)3(PF6)2) and TBAOX, was cast as a film on indium tin oxide-coated glass (anode) by spin-coating, and a top electrode (cathode) was prepared by brush-painting Ag paint. Application of 1.6 V DC bias across the device resulted in the onset of light emission. The maximum luminance was achieved at 1:5 mol ratio of Ru(bpy)3(PF6)2 and TBAOX, and the turn-on voltage was independent of the composition. The simplicity of the ECL device and its low voltage operation characteristics make it potentially attractive as a display element for printed electronic circuits.

Original languageEnglish (US)
Pages (from-to)5358-5364
Number of pages7
JournalChemistry of Materials
Volume26
Issue number18
DOIs
StatePublished - Sep 1 2014

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