Synthesis,photophysical and electro-optical properties of bis-carbazolyl methane based host material for pure-blue phosphorescent OLED |
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Authors: | Byoung-Joon Moon Kyoung Soo Yook Jun Yeob Lee Seunghan Shin Seok-Ho Hwang |
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Institution: | 1. Department of Polymer Science & Engineering and Center for Photofunctional Energy Materials, Dankook University, Yongin, Gyeonggi 448–701, Korea;2. Chonan R&D Center, KITECH, Chonan, Chungnam 330–825, Korea |
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Abstract: | A new high triplet-energy host material, 9-(4-(bis(9-ethyl-9H-carbazol-3-yl)methyl)phenyl)-9H-carbazole (bis-CMPC), was synthesized and its device performance of phosphorescent organic light-emitting diode was investigated. This host material showed a high triplet energy (~2.95 eV) and good thermal stability. Highly efficient pure-blue PHOLED was obtained when employing bis-CMPC as the host material and bis((3,5-difluoro-4-cyanophenyl)pyridine) iridium picolinate as the guest material. The maximum external quantum efficiency of the device reached as high as 13.3% with a pure-blue color coordinate of (0.14, 0.21). |
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