Abstract
New Ir(III) compound with sky-blue phosphorescence has been synthesized by one-pot reaction of [Ir(COD)2]BF4 with 2,3-dimethylimidazo[1,2-f]phenanthridine. This complex has a facial(fac) geometry around iridium metal center. The ligand has been found to significantly interact with adjacent molecules through π-stacking interactions in solid state packing. The Ir(III) complex emits brightly sky blue phosphorescence with λmax=468nm and quantum efficiencies of 0.23 in solution. Multi-layer electroluminescent devices using this complex as a dopant, and 1,3-bis(N-carbazolyl)benzene as the host/hole transporting layer, have been fabricated. The electroluminescence device at the doping level of 3–10wt% has the excellent performance with external quantum efficiency of 15%–20% at the brightness of 10cd/m2–1000cd/m2 and the maximum power efficiency of 35.9lm/W.
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