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Title: | New phosphorescent iridium(iii) dipyrrinato complexes: synthesis, emission properties and their deep red to near-infrared OLEDs | Authors: | Zhang, H Wang, H Tanner, K Schlachter, A Chen, Z Harvey, PD Chen, S Wong, WY |
Issue Date: | 14-Aug-2021 | Source: | Dalton transactions : an international journal of inorganic chemistry, 14 Aug. 2021, v. 50, no. 30, p. 10629-10639 | Abstract: | A series of heteroleptic Ir(iii) complexes composed of two cyclometalated C^N ligands and one dipyrrinato ligand used as an ancillary ligand are synthesized and characterized. With the introduction of a fluorine atom, phenyl ring or diphenylamino group into both C^N ligands and by keeping the ancillary ligand unchanged, these Ir(iii) dipyrrinato phosphors do not show an obvious shift in their emission bands. They exhibit emissions extending well into the near-infrared region with an intense band located at around 685 nm in both photo- and electroluminescence spectra, and the deep red to near-infrared organic light emitting diodes (OLEDs) based on them afforded a maximum external quantum efficiency of 2.8%. Density functional theory (DFT) calculations show that both the electronic contributions on the lowest unoccupied molecular orbitals (LUMOs) and the highest energy semi-occupied molecular orbitals (HSOMOs) are mainly localized on the dipyrrinato ligand, indicating that the ancillary ligand, which remains unchanged in this series, exhibits a lower triplet state energy in the iridium phosphors than those involving the C^N ligands. Therefore a switch from “(C^N)2Ir” to dipyrrinato ligand-based emission is observed in these iridium(iii) complexes. | Publisher: | Royal Society of Chemistry | Journal: | Dalton transactions : an international journal of inorganic chemistry | ISSN: | 1477-9226 | EISSN: | 1477-9234 | DOI: | 10.1039/d1dt01557e | Rights: | This journal is © The Royal Society of Chemistry 2021 The following publication Zhang, H., Wang, H., Tanner, K., Schlachter, A., Chen, Z., Harvey, P. D., ... & Wong, W. Y. (2021). New phosphorescent iridium (iii) dipyrrinato complexes: synthesis, emission properties and their deep red to near-infrared OLEDs. Dalton Transactions, 50(30), 10629-10639 is available at https://doi.org/10.1039/d1dt01557e. |
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