Royal Society of Chemistry, Journal of Materials Chemistry C Materials for optical and electronic devices, 9(2), p. 1605-1611, 2014
DOI: 10.1039/c3tc31983k
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Carbazole, a commonly used hole-transporter for organic electronics, has been modified with an imidazolium cation and a hexafluorophosphate counter-anion to give an ionic hole-transporter. It has been applied as one of the hosts in a host-guest blue light-emitting electrochemical cell (LEC) with the neutral blue emitter FIrPic. We have obtained efficient and bright blue LECs with an electroluminescence maximum at 474 nm and efficacy of 5 cd A-1 at a luminance of 420 cd m-2, thereby demonstrating the potential of the ionic organic charge-transporters and of the host-guest architecture for LECs.