4,4′,4″-Tris(N-carbazolyl)-triphenylamine interlayer in highly efficient phosphorescent organic light emitting diodes based on tris[4-methyl-2-2(4′-trimethylsilylphenyl)pyridine]iridium complex |
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| Authors: | K. ThangarajuJonghee Lee Jeong-Ik LeeHye Yong Chu Seul-Ong KimMin-Gi Shin Yun-Hi Kim Kwon Soon-Ki |
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| Affiliation: | a School of Materials Science and Engineering, and Research Institute for Green Energy Convergence Technology (RIGEC), Gyeongsang National University, Jinju-660 701, South Koreab Convergence Components and Materials Research Laboratory, Electronics and Telecommunications Research Institute, Daejeon 305-350, South Koreac Department of Chemistry & Research Institute of Natural Sciences (RINS), Gyeongsang National University, Jinju-660 701, South Korea |
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| Abstract: | We developed highly efficient yellowish-green emitting phosphorescent organic light emitting diodes based on tris[4-methyl-2-2(4′-trimethylsilylphenyl)pyridine] [Ir(msippy)3]. The device showed electroluminescence emission from the dopant emitter at 521 nm with CIE color coordinates of (0.32, 0.62). We investigated the roll of 4,4′,4″-Tris(carbazol-9-yl)triphenylamine (TcTa) interlayer between hole transporting and emissive layers on the higher device performances using different hole transporting materials. TcTa interlayer in the device using Di-[4-(N,N-ditolyl-amino)-phenyl]cyclohexane as hole transporting layer confines the excitons within the emissive layer and improves the charge balance, resulting in higher device external quantum efficiency of 25.6% and current efficiency of 84.4 cd/A with improved efficiency roll-off. |
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| Keywords: | Phosphorescent organic light emitting devices Iridium(III) complex Yellowish-green emission External quantum efficiency Efficiency roll-off |
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