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http://hdl.handle.net/10397/91973
| 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 |
| Appears in Collections: | Journal/Magazine Article |
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| 1-s2.0-S2589004221008798-main.pdf | 2.59 MB | Adobe PDF | View/Open |
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