Document Type

Journal Article

Authors

Xiaolong Yang, Department of Chemistry, Faculty of Science, Xi'An Jiaotong University
Yongbiao Zhao, State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences
Xinwen Zhang, Key Laboratory for Physical Electronics and Devices of the Ministry of Education, School of Electronic and Information Engineering, Xi'An Jiaotong University
Rui Li, Department of Chemistry, Faculty of Science, Xi'An Jiaotong University
Jingshuang Dang, Department of Chemistry, Faculty of Science, Xi'An Jiaotong University
Yan Li, State Key Laboratory of Theoretical and Computational Chemistry, Institute of Theoretical Chemistry, Jilin University
Guijiang Zhou, Department of Chemistry, Faculty of Science, Xi'An Jiaotong University
Zhaoxin Wu, Key Laboratory for Physical Electronics and Devices of the Ministry of Education, School of Electronic and Information Engineering, Xi'An Jiaotong University
Dongge Ma, State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences
Wai-Yeung Wong, Institute of Molecular Functional Materials, Department of Chemistry and Centre for Advanced Luminescence Materials, Hong Kong Baptist UniversityFollow
Xiang Zhao, Department of Chemistry, Faculty of Science, Xi'An Jiaotong University
Aimin Ren, State Key Laboratory of Theoretical and Computational Chemistry, Institute of Theoretical Chemistry, Jilin University
Lixiang Wang, State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences
Xun Hou, Key Laboratory for Physical Electronics and Devices of the Ministry of Education, School of Electronic and Information Engineering, Xi'An Jiaotong University

Department/Unit

Department of Chemistry

Title

Thiazole-based metallophosphors of iridium with balanced carrier injection/transporting features and their two-colour WOLEDs fabricated by both vacuum deposition and solution processing-vacuum deposition hybrid strategy

Language

English

Abstract

New phosphorescent iridium(iii) cyclometallated complexes bearing thiazole-based ligands (IrTZ1 and IrTZ2) have been developed. The functionalized organic ligands derived by combining the thiazolyl moiety and triphenylamino group have conferred not only favorable hole-injection/hole-transporting (HI/HT) features but also more balanced charge carrier injection/transporting traits to the as-prepared iridium(iii) metallophosphors. Owing to the unique electronic structures afforded by the ligand, the orange organic light-emitting devices (OLEDs) made from IrTZ1 can furnish peak external quantum efficiency (η ext) of 14.82%, luminance efficiency (η L) of 39.97 cd A -1 and power efficiency (η p) of 34.95 lm W -1. Inspired by its outstanding electroluminescence (EL) performance, the orange IrTZ1 phosphor complemented with a blue phosphor FIrpic was employed to fabricate highly efficient white organic light-emitting devices (WOLEDs) with a single emission layer. Despite their simple device configuration, the optimized WOLEDs can still maintain decent electroluminescence (EL) ability with η ext of 7.20%, η L of 18.07 cd A -1 and η p of 19.57 lm W -1. With the aim to simplify the fabrication process of multi-layered WOLEDs, two-component WOLEDs were obtained through a novel solution processing-vacuum deposition hybrid method with the doped blue fluorescent emission layer deposited by a solution process and the orange phosphorescent emission layer made by vacuum deposition. The WOLEDs prepared using such exploratory approach can show an attractive EL performance with η ext of 9.06%, η L of 22.72 cd A -1 and η p of 17.28 lm W -1. All these data have indicated not only the great potential of the orange phosphor in monochromatic and white OLEDs, but also the importance of the hybrid method for simplifying WOLED fabrication. © 2012 The Royal Society of Chemistry.

Publication Date

2012

Source Publication Title

Journal of Materials Chemistry

Volume

22

Issue

15

Start Page

7136

End Page

7148

Publisher

Royal Society of Chemistry

DOI

10.1039/C2JM14712B

Link to Publisher's Edition

http://dx.doi.org/10.1039/C2JM14712B

ISSN (print)

09599428

ISSN (electronic)

13645501

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