Near-infrared cyclometalated iridium(iii) complexes with bipolar features for efficient OLEDs via solution-processing

Junting Yu; Maoqiu Li; Chao Xu; Fanyuan Meng; Jiamin Cao; Hua Tan; Weiguo Zhu

doi:10.1039/d0dt01415j

Near-infrared cyclometalated iridium(iii) complexes with bipolar features for efficient OLEDs via solution-processing

Dalton Trans. 2020 Jun 29;49(25):8785-8790. doi: 10.1039/d0dt01415j.

Authors

Junting Yu¹, Maoqiu Li¹, Chao Xu², Fanyuan Meng², Jiamin Cao¹, Hua Tan³, Weiguo Zhu³

Affiliations

¹ Key Laboratory of Theoretical Organic Chemistry and Functional Molecule, Ministry of Education, College of Chemistry and Chemical Engineering, Hunan University of Science and Technology, Xiangtan 411201, P. R. China. yujuntingtt@163.com.
² College of Chemistry, Xiangtan University, Xiangtan 411105, P. R. China. chaoxu_0205@163.com.
³ School of Materials Science and Engineering, Changzhou University, Changzhou 213164, P. R. China. zhuwg18@126.com.

PMID: 32555837
DOI: 10.1039/d0dt01415j

Abstract

A novel bipolar NIR iridium(iii) complex (CH3OTPA-BTz-Iq)2Ir(pic-OXD) with both a hole transporting (HT) triphenylamine (TPA) group and an electron transporting (ET) oxadiazole (OXD) group was designed and synthesized. It was observed that the incorporation of OXD and TPA into the ligand (CH3OTPA-BTz-Iq)2Ir(pic-OXD) improved the optophysical and electroluminescence performance in comparison with the parent iridium(iii) complex (CH3OTPA-BTz-Iq)2Irpic. In (CH3OTPA-BTz-Iq)2Ir(pic-OXD)-based OLEDs, a maximum external quantum efficiency (EQEmax) of 1.15% at 716 nm was obtained, which is much superior than that of the (CH3OTPA-BTz-Iq)2Irpic-based OLEDs (0.41% at 723 nm).