Abstract
The preparation and electrical properties of ionic transition metal complex light‐emitting electrochemical cells using phenanthroline‐based ancillary ligands in metal complexes have been investigated. Luminous layer was prepared by the synthesis of tetrakis(2‐phenylpyridine‐C,N′)(μ‐dichloro)diiridium and two kinds of phenathroline ancillary ligands and the ion exchange of ammonium hexafluorophosphate. Two devices have been fabricated with structures of ITO/poly(3,4‐ethylenedixythionphene)‐poly(styrenesulfonate)(PEDOT:PSS)/[iridium(2‐phenylpyridine)2(5‐methyl‐1,10‐phenathroline)]PF6/Al and ITO/poly(3,4‐ethylenedixythionphene)‐poly(styrenesulfonate) (PEDOT:PSS)/[iridium(2‐phenylpyridine)2(5,6‐dimethyl‐1,10‐phenathroline)]PF6/Al. Both devices presented yellow emission color and showed low turn‐on voltage, which were approximately 3 V and high luminance. The device based on ITO/PEDOT:PSS/[iridium(2‐phenylpyridine)2(5,6‐dimethyl‐1,10‐phenathroline)]PF6/Al showed higher luminance than the other. Copyright © 2012 John Wiley & Sons, Ltd.
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