Highly efficient orange organic light-emitting diodes using a novel iridium complex with imide group-containing ligands?

Journal of Materials Chemistry Pub Date: 2009-10-14 DOI: 10.1039/B915384E

Abstract

We report the synthesis and device characterization of a novel iridium complex using a phenylpyridine derivative containing an imide functional group as a bis-cyclometallized ligand ((impy)2Ir(acac)) for orange organic light-emitting diodes (OLEDs). The photoluminescence of the dopant emits orange light with the main peak of 560 nm and a shoulder of 595 nm. The OLEDs made with the synthesized dopant also produce intense orange electroluminescence at 568–572 nm wavelengths depending on the device geometry. Very high peak external quantum efficiencies of 13.8–14.4%, peak power efficiencies of 29.2–32.7 lm/W, and low operation voltages of 5.3–5.4 V at 1000 cd/m2 have been demonstrated for the orange OLEDs.

Graphical abstract: Highly efficient orange organic light-emitting diodes using a novel iridium complex with imide group-containing ligands
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