Near-infrared cyclometalated iridium(iii) complexes with bipolar features for efficient OLEDs via solution-processing
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Updated: Dec 18, 2025

Development of Efficient OLEDs from Solution Deposition
Published on: November 4, 2022
Junting Yu1, Maoqiu Li1, Chao Xu2
1Key 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.
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).
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