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Molecules 2014, 19(9), 14247-14256; doi:10.3390/molecules190914247

Novel Hole Transporting Materials Based on 4-(9H-Carbazol-9-yl)triphenylamine Derivatives for OLEDs

1
The Division of Bio-Nanochemistry, College of Natural Sciences and the Institute for Basic Science, Wonkwang University, Iksan City, Chonbuk 570-749, Korea
2
Department of Information Display, Kyung Hee University, Dongdaemoon-gu, Seoul 130-701, Korea
3
Venture Building, #824, Palbokdong 2-ga, Deokjin-gu, Jeonju, Chonbuk 561-844, Korea
These authors contributed equally to this work.
*
Authors to whom correspondence should be addressed.
Received: 3 July 2014 / Revised: 2 September 2014 / Accepted: 4 September 2014 / Published: 10 September 2014
(This article belongs to the Section Molecular Diversity)
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Abstract

During the past few years, organic light emitting diodes (OLEDs) have been increasingly studied due to their emerging applicability. However, some of the properties of existing OLEDs could be improved, such as their overall efficiency and durability; these aspects have been addressed in the current study. A series of novel hole-transporting materials (HTMs) 3ac based on 4-(9H-carbazol-9-yl)triphenylamine conjugated with different carbazole or triphenylamine derivatives have been readily synthesized by Suzuki coupling reactions. The resulting compounds showed good thermal stabilities with high glass transition temperatures between 148 and 165 °C. The introduction of HTMs 3b and 3c into the standard devices ITO/HATCN/NPB/HTMs 3 (indium tin oxide/dipyrazino(2,3-f:2ꞌ,3ꞌ-h)quinoxaline 2,3,6,7,10,11-hexacarbonitrile/N,Nꞌ-bis(naphthalen-1-yl)-N,Nꞌ-bis(phenyl)-benzidine/HTMs)/CBP (4,4ꞌ-Bis(N-carbazolyl)-1,1ꞌ-biphenyl): 5% Ir(ppy)3/Bphen/LiF/Al (tris[2-phenylpyridinato-C2,N]iridium(III)/4,7-diphenyl-1,10-phenanthroline/LiF/Al) resulted in significantly enhanced current, power, and external quantum efficiencies (EQE) as compared to the reference device without any layers of HTMs 3. View Full-Text
Keywords: organic light emitting diodes; hole-transporting material; 4-(9H-carbazol-9-yl)triphenylamine; carbazole; triarylamine organic light emitting diodes; hole-transporting material; 4-(9H-carbazol-9-yl)triphenylamine; carbazole; triarylamine
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MDPI and ACS Style

Nguyen, Q.P.B.; Baek, S.J.; Kim, M.J.; Shin, N.Y.; Kim, G.W.; Choe, D.C.; Kwon, J.H.; Chai, K.Y. Novel Hole Transporting Materials Based on 4-(9H-Carbazol-9-yl)triphenylamine Derivatives for OLEDs. Molecules 2014, 19, 14247-14256.

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