Phenanthridine based Ir(III) complex for blue phosphorescent organic light-emitting diodes with long-term operational stability

초록

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 pi-stacking interactions in solid state packing. The Ir(III) complex emits brightly sky blue phosphorescence with lambda(max) = 468 nm 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 3-10 wt% has the excellent performance with external quantum efficiency of 15%-20% at the brightness of 10 cd/m(2)-1000 cd/m(2) and the maximum power efficiency of 35.9 lm/W. (C) 2017 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.

키워드