期刊
JOURNAL OF MATERIALS CHEMISTRY
卷 22, 期 44, 页码 23485-23491出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c2jm35618j
关键词
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资金
- National Science Fund for Distinguished Young Scholars of China [51125013]
- National Basic Research Program of China (973 Program) [2009CB623602, 2009CB930603]
- National Natural Science Foundation of China [90922020]
- Fundamental Research Funds for the Central Universities of China
- Open Research Fund of State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences
Two new hole-transporting materials, namely HFB-Cz and HFB-Dpa, were designed and synthesized by attaching carbazole and diphenylamine units to the hexakis(9,9-dihexyl-9H-fluoren-2-yl)benzene (HFB) core via Buchwald-Hartwig coupling reaction. The long alkyl chain and core rigidity endow these compounds with good solution processability and high thermal stability. HFB-Cz and HFB-Dpa exhibit significantly high glass transition temperatures (225 and 154 degrees C) relative to widely used hole-transporting materials, such as N,N'-bis(3-methylphenyl)-1,1'-biphenyl-4, 4'-diamine (TPD, 65 degrees C) and 1,4-bis((1-naphthylphenyl)amino)biphenyl (NPB, 96 degrees C). Solution-processed green OLED devices using HFB-Cz and HFB-Dpa as hole-transporting materials exhibit very high efficiencies with a maximum current efficiency up to 6.2 cd A(-1). These efficiencies are substantially higher than the NPB-based control device, and are among the highest for the hole-transporting materials in similar device configuration.
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