Four highly efficient cuprous complexes and their applications in solution-processed organic light-emitting diodes

Qing Zhang; Xu-Lin Chen; Jun Chen; Xiao-Yuan Wu; Rongmin Yu; Can-Zhong Lu

doi:10.1039/C5RA04591F

Four highly efficient cuprous complexes and their applications in solution-processed organic light-emitting diodes†

Qing Zhang,^abc Xu-Lin Chen,^ab Jun Chen,^c Xiao-Yuan Wu,^ab Rongmin Yu^ab and Can-Zhong Lu*^ab

* Corresponding authors

^a Key Laboratory of Design and Assembly of Functional Nanostructures, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, China
E-mail: czlu@fjirsm.ac.cn
Fax: +86-591-8370-5794

^b Fujian Provincial Key Laboratory of Nanomaterials, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, China

^c Graduate University of Chinese Academy of Sciences, Beijing 100049, China

Abstract

Four mononuclear cationic Cu(I) complexes featuring functional C-linked pyrazolyl pyridine diimine ligands have been synthesized and characterized. Under UV 365 nm at room temperature, these complexes emit similar orange light in solution and green light in thin film, which could be attributed to the limited charge and steric influence of these methyl or trifluoromethyl substituted phenyl appendages at the pyrazol ring. Moreover, multilayer organic light-emitting diodes (OLEDs) based on these Cu(I) complexes had different performance efficiencies. The device with complex 1 as the light emitting material had the highest current efficiency of 17.8 cd A⁻¹ and an external quantum efficiency (EQE) of 6.4%, while the device with complex 2 which shows the highest photoluminescence quantum yields gave the poorest device efficiency with a current efficiency of 13 cd A⁻¹ and an EQE of 4.7%.

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DOI: https://doi.org/10.1039/C5RA04591F
Article type: Paper
Submitted: 16 Mar 2015
Accepted: 07 Apr 2015
First published: 08 Apr 2015

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RSC Adv., 2015,5, 34424-34431

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Four highly efficient cuprous complexes and their applications in solution-processed organic light-emitting diodes

Q. Zhang, X. Chen, J. Chen, X. Wu, R. Yu and C. Lu, RSC Adv., 2015, 5, 34424 DOI: 10.1039/C5RA04591F

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Four highly efficient cuprous complexes and their applications in solution-processed organic light-emitting diodes†

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Four highly efficient cuprous complexes and their applications in solution-processed organic light-emitting diodes

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