title: Novel hole transporting materials based on 4-(9H-carbazol-9-yl)triphenylamine derivatives for OLEDs.
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) 3a-c 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:2',3'-h)quinoxaline 2,3,6,7,10,11-hexacarbonitrile/N,N'-bis(naphthalen-1-yl)-N,N'-bis(phenyl)-benzidine/HTMs)/CBP (4,4'-Bis(N-carbazolyl)-1,1'-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.
authors.affiliation: The Division of Bio-Nanochemistry, College of Natural Sciences and the Institute for Basic Science, Wonkwang University, Iksan City, Chonbuk 570-749, Korea.
authors.forename: Quynh Pham Bao
authors.initials: QP
authors.lastname: Nguyen
authors.affiliation: The Division of Bio-Nanochemistry, College of Natural Sciences and the Institute for Basic Science, Wonkwang University, Iksan City, Chonbuk 570-749, Korea.
authors.forename: Sueng Ji
authors.initials: SJ
authors.lastname: Baek
authors.affiliation: The Division of Bio-Nanochemistry, College of Natural Sciences and the Institute for Basic Science, Wonkwang University, Iksan City, Chonbuk 570-749, Korea.
authors.forename: Mi Jin
authors.initials: MJ
authors.lastname: Kim
authors.affiliation: Venture Building, #824, Palbokdong 2-ga, Deokjin-gu, Jeonju, Chonbuk 561-844, Korea.
authors.forename: Na Young
authors.initials: NY
authors.lastname: Shin
authors.affiliation: Department of Information Display, Kyung Hee University, Dongdaemoon-gu, Seoul 130-701, Korea.
authors.forename: Gyeong Woo
authors.initials: GW
authors.lastname: Kim
authors.affiliation: Department of Information Display, Kyung Hee University, Dongdaemoon-gu, Seoul 130-701, Korea.
authors.forename: Dong Cheol
authors.initials: DC
authors.lastname: Choe
authors.affiliation: Department of Information Display, Kyung Hee University, Dongdaemoon-gu, Seoul 130-701, Korea. jhkwon@khu.ac.kr.
authors.forename: Jang Hyuk
authors.initials: JH
authors.lastname: Kwon
authors.affiliation: The Division of Bio-Nanochemistry, College of Natural Sciences and the Institute for Basic Science, Wonkwang University, Iksan City, Chonbuk 570-749, Korea. geuyoon@wonkwang.ac.kr.
authors.forename: Kyu Yun
authors.initials: KY
authors.lastname: Chai
mesh_terms: D000814:Aniline Compounds / Q000737:chemistry*; D008029:Lighting; D049449:Luminescence; D055668:Photochemical Processes
chemical_list: D000814:Aniline Compounds