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Issue 31, 2014
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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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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.

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

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Supplementary files

Article information


Submitted
01 Mar 2014
Accepted
25 May 2014
First published
30 Jun 2014

J. Mater. Chem. C, 2014,2, 6333-6341
Article type
Paper
Author version available

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

F. Wei, J. Qiu, X. Liu, J. Wang, H. Wei, Z. Wang, Z. Liu, Z. Bian, Z. Lu, Y. Zhao and C. Huang, J. Mater. Chem. C, 2014, 2, 6333
DOI: 10.1039/C4TC00410H

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