Add time:07/14/2019         Source:sciencedirect.com

A series of diphenylphosphoryl-substituted bis-cyclometalated Ir(III) complexes (POFIrpic, 4Me-POFIrpic, 5Me-POFIrpic, 5F-POFIrpic and 5CF3-POFIrpic) with a picolinic acid as the ancillary ligand have been synthesized and characterized. The influence of substituents (CH3, F, CF3) at the pyridyl moiety of the cyclometalating ligand POFdFppy (2-(2′,4′-difluoro-3′-diphenylphosphoryl)phenylpyridine) on the photophysical and electrochemical properties of these Ir(III) complexes has been investigated. These Ir(III) complexes exhibit intense emission bands at 455–492 nm and high phosphorescence quantum yields (ΦPL) in a range of 54–64% in CH2Cl2. The phosphorescence oxygen sensing properties of these complexes were studied in solution and in polymer film, and a fast response time and excellent operational stability were observed. Two-site model fitting indicates that 5Me-POFIrpic is the most sensitive oxygen sensing material among the complexes, with a quenching constant Ksvapp of 0.00793 Torr−1. Photodegradation tests demonstrate that introduction of a CF3 group into the cyclometalating ligand improves the photostability of the corresponding Ir(III) complex.

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