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Novel indolocarbazole-based bipolar host materials for fabricating green phosphorescent organic light-emitting diodes with high efficiency and low roll-off
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- Authors
- Eunju Shin, Baeksang Sung, Chul Woong Joo, Dasol Kim, Jinhwa Kim, Jonghee Lee, Yun-Hi Kim
- Issue Date
- 2024-07
- Citation
- Dyes and Pigments, v.226, pp.1-6
- ISSN
- 0143-7208
- Publisher
- Elsevier BV
- Language
- English
- Type
- Journal Article
- Abstract
- Herein we report two novel host materials, viz., 2-(dibenzo [b,d]furan-2-yl)indolo [3,2,1-jk]carbazole (ICz-DBF) and 3-(indolo [3,2,1-jk]carbazol-2-yl)furo [2,3-b:5,4-b']dipyridine (ICz-PFP), for fabricating highly stable and efficient organic light-emitting diodes (OLEDs). Green phosphorescent OLEDs (PhOLEDs) based on ICz-DBF and ICz-PFP exhibited less efficiency roll-off than those based on 4,4′-bis(N-carbazolyl)-1,1′-biphenyl (CBP) host, and especially, the ICz-DBF-based device achieved a high external quantum efficiency (EQE) of 20.5 %. Bipolar hosts composed of indolocarbazole (ICz) exhibit strong molecular rigidity, high triplet energy, and fast electron transport properties; therefore, they act as acceptors, but dibenzofuran (DBF) and dipyridofuran (PFP) substitutions endow them with controlled electron-donating characteristics. The bipolar properties of the new host materials were demonstrated by single-carrier device analysis, confirming the effectiveness of our research strategy for developing hosts for high-quality OLEDs.
- KSP Keywords
- Electron transport properties, Electron-donating, Fast electron transport, Furan-2, High-quality, Highly stable, Molecular rigidity, Research strategy, Single-carrier(SC), bipolar host materials, efficiency roll-off