基于氟取代位点效应的铂(Ⅱ)配合物电致发光性能调控OA

Three new cyclometalated platinum(Ⅱ)complexes,PtB,PtB-F-2,and PtB-F-1,were designed and synthesized to systematically investigate the influence of fluorine substitution sites on their photophysical and elec-troluminescent properties.The structures of these complexes were confirmed by 1H/13C NMR and mass spectrometry.Combined experimental characterization and theoretical calculations were employed to elucidate the regulatory effect of fluorine substituents on the photophysical and electrochemical behaviors of the complexes.The results reveal that the substitution position of the fluorine atom has a pronounced impact on the emission spectra.Compared with the non-fluorinated PtB,PtB-F-2 exhibits a red-shifted emission,whereas PtB-F-1 shows a blue-shifted emission.In degassed dichloromethane solutions at room temperature,all complexes display bright green emission in the range of 505-533 nm,with photoluminescence quantum yields of 20.1％-27.2％and lifetime of 1.96-3.87 μs.When applied as the emissive dopants in organic light-emitting devices,the corresponding devices exhibit intense green elec-troluminescence with maximum external quantum efficiencies(EQEs)of 19.4％-22.2％and maximum luminance values of 24 761-30 316 cd·m-2.Among them,PtB-F-1 and its device demonstrate the best photoluminescent and electroluminescent performance.This study highlights that precise modulation of fluorine substitution sites within the PtB backbone effectively tunes the emission characteristics of Pt(Ⅱ)complexes,offering a feasible molecular design strategy for high-performance organic light-emitting materials and devices.