Issue 15, 2012
From the journal:

Journal of Materials Chemistry

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†

Xiaolong Yang,a   Yongbiao Zhao,c   Xinwen Zhang,b   Rui Li,a   Jingshuang Dang,a   Yan Li,e   Guijiang Zhou,*a   Zhaoxin Wu,*b   Dongge Ma,*c   Wai-Yeung Wong,*d   Xiang Zhao,a   Aimin Ren,e   Lixiang Wangc  and  Xun Houb  

* Corresponding authors

a MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter and Faculty of Science, Department of Chemistry, Xi'an Jiaotong University, Xi'an, P.R. China
E-mail: zhougj@mail.xjtu.edu.cn
Fax: +86-29-8266-3914

b Key Laboratory for Physical Electronics and Devices of the Ministry of Education, School of Electronic and Information Engineering, Xi'an Jiaotong University, Xi'an, P.R. China
E-mail: zhaoxinwu@mail.xjtu.edu.cn
Fax: +86-29-8266-4867

c State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, P.R. China
E-mail: mdg1014@ciac.jl.cn
Fax: +86-431-5684-937

d Institute of Molecular Functional Materials and Department of Chemistry and Centre for Advanced Luminescence Materials, Hong Kong Baptist University, Waterloo Road, Kowloon Tong, Hong Kong, P.R. China
E-mail: rwywong@hkbu.edu.hk
Fax: +852-3411-7348

e State Key Laboratory of Theoretical and Computational Chemistry, Institute of Theoretical Chemistry, Jilin University, Changchun, P.R. China

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 (ηext) of 14.82%, luminance efficiency (ηL) of 39.97 cd A−1 and power efficiency (ηp) 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 ηext of 7.20%, ηL of 18.07 cd A−1 and ηp 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 ηext of 9.06%, ηL of 22.72 cd A−1 and ηp 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.

Graphical abstract: 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

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Article information

DOI
https://doi.org/10.1039/C2JM14712B
Article type
Paper
Submitted
21 Sep 2011
Accepted
22 Nov 2011
First published
25 Jan 2012

J. Mater. Chem., 2012,22, 7136-7148

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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

X. Yang, Y. Zhao, X. Zhang, R. Li, J. Dang, Y. Li, G. Zhou, Z. Wu, D. Ma, W. Wong, X. Zhao, A. Ren, L. Wang and X. Hou, J. Mater. Chem., 2012, 22, 7136 DOI: 10.1039/C2JM14712B

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