Deep blue phosphorescent organic light-emitting diodes with excellent external quantum efficiency |
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| Authors: | Jungeun Park Hankook Oh Sihyun Oh Jinho Kim Hyun Jin Park Oh Young Kim Jun Yeob Lee Youngjin Kang |
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| Affiliation: | 1. Department of Chemistry & Division of Science Education, Kangwon National University, 200-701 Chuncheon, Republic of Korea;2. Department of Polymer Science & Engineering, Dankook University, Yongin, Gyeonggi-do 448-701, Republic of Korea |
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| Abstract: | Highly efficient deep blue phosphorescent organic light-emitting diodes (PHOLEDs) using two heteroleptic iridium compounds, (dfpypy)2Ir(acac) and (dfpypy)2Ir(dpm), as a dopant and 9-(3-(9H-carbazol-9-yl)phenyl)-9H-carbazol-3-yl)diphenylphosphine oxide as a host material have been developed. The electroluminescent device of (dfpypy)2Ir(dpm) at the doping level of 3 wt% shows the best performance with external quantum efficiency of 18.5–20.4% at the brightness of 100–1000 cd/m2 and the color coordinate of (0.14, 0.18) at 1000 cd/m2. |
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| Keywords: | Phosphorescent organic light-emitting diodes (PHOLEDs) Heteroleptic iridium(III) complex Deep-blue triplet emitter External quantum efficiency |
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