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Title: Iridium(III) complexes with 1-phenylisoquinoline-4-carbonitrile units for efficient NIR organic light-emitting diodes
Authors: Zhang, H 
Xu, Y
Chen, Z
Chen, S
Liu, R 
Wong, WY 
Issue Date: Aug-2021
Source: iScience, 20 Aug. 2021, v. 24, no. 8, 102911
Abstract: Achieving the high external quantum efficiency (EQE) of near-infrared (NIR) emission in iridium(III) complexes still remains a challenge owing to their unsteady excited states which easily decay to the ground states through the nonradiative pathways. Herein, three Ir(III) phosphors in which the cyclometalated ligand 1-phenylisoquinoline-4-carbonitrile (piq-CN) is functionalized with the cyano, tert-butyl, and dimethyl groups are developed (CN-CNIr, Bu-CNIr, and DM-CNIr, respectively). Three simple synthetic steps can afford this class of deep red to NIR Ir(III) emitters. The organic light-emitting diodes (OLEDs) based on Bu-CNIr and DM-CNIr attain the maximum EQEs of 7.1% and 7.2% with the emission peaks at 695 and 714 nm, respectively. This strategy using substituted piq-CN derivatives as the cyclometalated ligands can offer an effective approach to promote the radiative rate of NIR-emitting Ir(III) materials. An insight into how the electron-withdrawing and electron-donating substituents on ligands influence the optoelectronic properties of their Ir(III) complexes is also provided.
Keywords: Optical materials
Optoelectronics
Photonics
Publisher: Cell Press
Journal: iScience 
EISSN: 2589-0042
DOI: 10.1016/j.isci.2021.102911
Rights: © 2021 The Author(s). This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
The following publication Zhang, H., Xu, Y., Chen, Z., Chen, S., Liu, R., & Wong, W. Y. (2021). Iridium (III) complexes with 1-phenylisoquinoline-4-carbonitrile units for efficient NIR organic light-emitting diodes. Iscience, 24(8), 102911 is available at https://doi.org/10.1016/j.isci.2021.102911
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