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3,3′-Bicarbazole-Based Host Molecules for Solution-Processed Phosphorescent OLEDs

Department of Chemistry, Kyonggi University, 154-42 Gwanggyosanro, Yeongtong-gu, Suwon-si, Gyeonggi 16227, Korea
Department of Materials Science and Engineering, The University of Seoul, 163 Seoulsiripdaero, Dongdaemun-gu, Seoul 02504, Korea
Advanced Materials Division, Korea Research Institute of Chemical Technology (KRICT), 141 Gajeong-ro, Yuseong-gu, Daejeon 34114, Korea
Authors to whom correspondence should be addressed.
Molecules 2018, 23(4), 847;
Received: 20 March 2018 / Revised: 3 April 2018 / Accepted: 5 April 2018 / Published: 8 April 2018
(This article belongs to the Section Organic Chemistry)
PDF [10533 KB, uploaded 3 May 2018]


Solution-processed organic light-emitting diodes (OLEDs) are attractive due to their low-cost, large area displays, and lighting features. Small molecules as well as polymers can be used as host materials within the solution-processed emitting layer. Herein, we report two 3,3′-bicarbazole-based host small molecules, which possess a structural isomer relationship. 9,9′-Di-4-n-butylphenyl-9H,9′H-3,3′-bicarbazole (BCz-nBuPh) and 9,9′-di-4-t-butylphenyl-9H,9′H-3,3′-bicarbazole (BCz-tBuPh) exhibited similar optical properties within solutions but different photoluminescence within films. A solution-processed green phosphorescent OLED with the BCz-tBuPh host exhibited a high maximum current efficiency and power efficiency of 43.1 cd/A and 40.0 lm/W, respectively, compared to the device with the BCz-nBuPh host. View Full-Text
Keywords: solution-processed OLED; phosphorescent OLED; host; bicarbazole solution-processed OLED; phosphorescent OLED; host; bicarbazole

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Kim, J.; Lee, S.; Lee, J.; Lim, E.; Jung, B.J. 3,3′-Bicarbazole-Based Host Molecules for Solution-Processed Phosphorescent OLEDs. Molecules 2018, 23, 847.

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