Effect of ionic liquids on the electroluminescence of yellowish-green light-emitting electrochemical cells using bis(2-(2,4-difluorophenyl)pyridine)4,7-diphenyl-1,10-phenanthroline-iridium(III) hexafluorophosphate |
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Authors: | Chozhidakath Damodharan Sunesh Ok SunseongMidhun Chandran Danbi MoonYoungson Choe |
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Affiliation: | Department of Polymer Science and Chemical Engineering, Pusan National University, Busan 609-735, South Korea |
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Abstract: | A cationic iridium complex Ir(dfppy)2(dpphen)]PF6, where dfppy is 2-(2,4-difluorophenyl)pyridine, dpphen is 4,7-diphenyl-1,10-phenanthroline and PF6− is hexafluorophosphate, has been synthesized and its photophysical and electrochemical properties were investigated. Light-emitting electrochemical cells (LECs) based on this complex were fabricated using air stable electrodes and emits yellowish-green light (533 nm) with Commission Internationale de L’Eclairage (CIE) coordinates of (0.35, 0.59) at 4 V. Effect of two different imidazolium based ionic liquids (ILs) viz, 1-butyl-3-methylimidazolium hexafluorophosphate (BMIMPF6) and 1-ethyl-3-methylimidazolium hexafluorophosphate (EMIMPF6) on the active layer has been studied and the luminance and the current density of the devices were found to be enhanced with increasing ionic conductivities. |
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Keywords: | Light-emitting electrochemical cells Ionic transition metal complexes OLEDs Ionic liquids |
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