Highly Efficient Red-Emitting Bis-Cyclometalated Iridium Complexes

Journal of the American Chemical Society
Po-Ni LaiThomas S Teets

Abstract

Bis-cyclometalated iridium complexes with enhanced phosphorescence quantum yields in the red region of the visible spectrum are described. Here, we demonstrate that incorporating strongly π-donating, nitrogen-containing β-ketoiminate (acNac), β-diketiminate (NacNac), and N, N'-diisopropylbenzamidinate (dipba) ancillary ligands can demonstrably perturb the excited-state kinetics, leading to enhanced photoluminescence quantum yields (ΦPL) for red-emitting compounds. A comprehensive study of the quantum yields and lifetimes for these complexes reveals that for the compounds with the highest quantum yields, the radiative rate constant ( kr) is significantly higher than that of related complexes, and contributes substantially to the increase in ΦPL. Experimental and computational evidence is consistent with the notion that an increase in spin-orbit coupling, caused by an enhancement of the metal-to-ligand charge transfer (MLCT) character of the excited state via destabilization of the HOMO, is mainly responsible for the faster radiative rates. One of the compounds was shown to be effective as the emissive dopant in an organic light-emitting diode device.

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Citations

Nov 10, 2018·Dalton Transactions : an International Journal of Inorganic Chemistry·Hua-Bo HanYou-Xuan Zheng
Nov 27, 2018·Dalton Transactions : an International Journal of Inorganic Chemistry·Chao ShiAihua Yuan
Mar 16, 2019·Dalton Transactions : an International Journal of Inorganic Chemistry·Adam F HenwoodEli Zysman-Colman
Feb 26, 2019·Chemistry : a European Journal·Po-Ni Lai, Thomas S Teets
May 9, 2019·Dalton Transactions : an International Journal of Inorganic Chemistry·Ning Su, You-Xuan Zheng
Jul 11, 2019·Chemistry, an Asian Journal·Andreea IonescuIolinda Aiello
Oct 3, 2019·Dalton Transactions : an International Journal of Inorganic Chemistry·Kie YamadaMasa-Aki Haga
Sep 11, 2019·Dalton Transactions : an International Journal of Inorganic Chemistry·Joseph J MihalyThomas G Gray
Jun 30, 2019·Luminescence : the Journal of Biological and Chemical Luminescence·Hazem AmarneSuning Wang
Aug 7, 2020·Biomaterials Science·Xu ZhenXiqun Jiang
Feb 5, 2021·Chemical Communications : Chem Comm·Sungwon Yoon, Thomas S Teets
Nov 27, 2020·Chemistry : a European Journal·Christopher E ElgarSimon J A Pope
Apr 30, 2021·Dalton Transactions : an International Journal of Inorganic Chemistry·Sergei V TatarinStanislav I Bezzubov
May 6, 2021·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Meng-Xi MaoYou-Xuan Zheng
Jun 26, 2021·Dalton Transactions : an International Journal of Inorganic Chemistry·Wolfram Feuerstein, Frank Breher
Feb 1, 2019·Journal of the American Chemical Society·José Antônio do Nascimento NetoFelipe Terra Martins
Nov 8, 2019·Inorganic Chemistry·Ewelina WitkowskaMieczyslaw Lapkowski
Aug 21, 2019·Inorganic Chemistry·Evanta KabirThomas S Teets
Aug 29, 2020·Inorganic Chemistry·Llorenç BenaventJui-Yi Tsai
Oct 5, 2021·Inorganic Chemistry·Sophie A FitzgeraldSimon J A Pope

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