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

Molecules

Quynh Pham Bao Nguyen²  Sueng Ji Baek²  Mi Jin Kim²  Na Young Shin¹  Gyeong Woo Kim³  Dong Cheol Choe³  Jang Hyuk Kwon³ 

[1] Venture Building, #824, Palbokdong 2-ga, Deokjin-gu, Jeonju, Chonbuk 561-844, Korea;The Division of Bio-Nanochemistry, College of Natural Sciences and the Institute for Basic Science, Wonkwang University, Iksan City, Chonbuk 570-749, Korea;Department of Information Display, Kyung Hee University, Dongdaemoon-gu, Seoul 130-701, Korea

关键词: organic light emitting diodes;    hole-transporting material;    4-(9H-carbazol-9-yl)triphenylamine;    carbazole;    triarylamine;   

DOI  :  10.3390/molecules190914247

来源: mdpi

【 摘 要 】

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.

【 授权许可】

CC BY   
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