Synthesis and luminescent properties of three excellent yellow emissive Cu(i) complexes based on the diphosphine ligand and the diimine ligand

Abstract

In this study, three excellent yellow emissive Cu(I) complexes were synthesized, namely [Cu₂I₂(bipy)(POP)₂]·4CH₂Cl₂ (1), [Cu₂Br₂(bipy)(POP)₂]·4CH₂Cl₂ (2), and [CuCl(bipy)(POP)]·CH₂Cl₂·CH₃OH (3) [bipy = 4,4′-bipyridine, POP = bis(2-diphenylphosphino-phenyl)ether]. The synthesis and characterization of three complexes are introduced. Complexes 1–3 have luminescent emission peaks of 529–532 nm, belonging to yellow light emission, and their quantum yield is 72–88%. Complex 2 exhibits an exceptionally high quantum yield of 88% and its lifetime is 9.6 μs. Among the available data, this result is one of the best luminescence results for yellow luminescent cuprous complexes. This study enriches the understanding of the photophysical properties of Cu(I) complexes and offers new insights for the development of efficient OLED materials.