Efficient orange-red phosphorescent organic light-emitting diodes using an in situ synthesized copper(I) complex as the emitter

Feng Wei; Jacky Qiu; Xiaochen Liu; Jianqiang Wang; Huibo Wei; Zhibin Wang; Zhiwei Liu; Zuqiang Bian; Zhenghong Lu; Yongliang Zhao; Chunhui Huang

doi:10.1039/C4TC00410H

Efficient orange-red phosphorescent organic light-emitting diodes using an in situ synthesized copper(i) complex as the emitter†

Feng Wei,^ad Jacky Qiu,^b Xiaochen Liu,^a Jianqiang Wang,*^c Huibo Wei,^a Zhibin Wang,^b Zhiwei Liu,*^a Zuqiang Bian,^a Zhenghong Lu,*^b Yongliang Zhao^d and Chunhui Huang^a

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* Corresponding authors

^a Beijing National Laboratory for Molecular Sciences (BNLMS), State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, P. R. China
E-mail: zwliu@pku.edu.cn
Fax: +86-10-6275-4745
Tel: +86-10-6275-7156

^b Department of Materials Science and Engineering, University of Toronto, 184 College Street, Toronto, Ontario, Canada M5S 3E4
E-mail: zhenghong.lu@utoronto.ca

^c Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201204, P. R. China
E-mail: wangjianqiang@sinap.ac.cn

^d College of Chemistry and Chemical Engineering, Inner Mongolia University, Hohhot 010021, P. R. China

Abstract

Inexpensive and eco-friendly luminescent Cu(I) complexes are ideal phosphorescent emitters for high efficiency organic light-emitting diodes (OLEDs). A series of pyrazinyl carbazole (CPz) compounds were designed and synthesized to obtain efficient luminescent Cu(I) complexes through reaction with CuI using a vacuum codeposition method. Based on photophysical studies of the CPz compounds and their codeposited CuI–CPz films, the compound 9-(3-(6-(carbazol-9-yl)pyrazin-2-yl)phenyl)-carbazole (CPzPC) with CuI was chosen as the emissive layer for OLED fabrication, where the emitter was identified as Cu₂(μ-I)₂(CPzPC)₄ on the basis of X-ray absorption spectroscopy. After optimizing the device architecture and material selection including the CuI doping concentration and hole transporting layer, an efficient orange-red emitting OLED with a maximum emission band, an external quantum efficiency (EQE), and a luminance of 590 nm, 6.6% and 8619 cd m⁻² (10 V), respectively, was achieved.

Journal of Materials Chemistry C

Efficient orange-red phosphorescent organic light-emitting diodes using an in situ synthesized copper(i) complex as the emitter†

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Efficient orange-red phosphorescent organic light-emitting diodes using an in situ synthesized copper(I) complex as the emitter

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