Synthesis, Structure and Properties of Green-emitting Iridium (III) Complexes

Abstract

Green-emitting iridium (III) complexes were synthesised using chlorobridged dimer(ppy)₂Ir₂Cl₂(ppy)₂, 3-hydroxy-2-methyl-γ-pyranone,2-ethyl-3-hydroxy-4-pyranone, and 5-hydroxy-2-(hydroxymethyl)-1,4-pyranone as the auxiliary ligand. The structure of the target product was characterised by nuclear magnetic resonance spectroscopy(¹H-NMR), infrared spectroscopy(IR) and mass spectrometry(MS), and its thermal stability, photophysical properties and electrochemical properties were investigated. The results show that the decomposition temperatures of Ir1, Ir2 and Ir3 are 3 49, 292 and 200 °C, respectively. The maximum emission wavelength of Ir1, Ir2 and Ir3 dissolved in dichloromethane is 491 nm. The HOMO energy level of Ir1, Ir2 and Ir3 are 5.39, −5.38, and −5.30 eV. The LUMO energy levels are −2.86, −2.85, and −2.80 eV, respectively.

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