Abstract
A strong hole transport type host material derived from bicarbazole and ditolylamine, 4,4′-(9H,9′H-[2,3′-bicarbazole]-9,9′-diyl)bis(N,N-di-p-tolylaniline) (BCTA), was synthesized as the host material of blue emitting tris[1-(2,4-diisopropyldibenzo[b,d]furan-3-yl)-2-phenylimidazole] (Ir(dbi)3) triplet emitter. The strong hole transport character of BCTA compensated hole trapping effect of Ir(dbi)3 and optimized charge balance in the emitting layer, delivering 17.8% external quantum efficiency in the blue phosphorescent organic light-emitting diodes.
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