High-efficiency narrow-emission blue organic light-emitting device(OLED)is one of the research hot-spots in the field of flexible display.In this paper,a D-A-D blue molecule,DPF-NA was designed and synthesized by using dinaphthyl[2,3-B∶2′,3′-D]furan as a weak electron acceptor and N-(4-biphenylyl)-1-naphthylamine as electron donors.The moleculeshows a photoluminescence(PL)peak at 441 nm in n-hexane solution.Theoretical calculations and photophysical measurements show that DPF-NA possesses hybridized localized charge transfer(HLCT)excited state characteristics,combining high luminescence efficiency of the localized state(LE)and high exciton utilization of the charge transfer(CT)state.As a consequence,the molecule shows a high PL photolumines-cence quantum efficiency(PLQY)of 81.2%in dichloromethane solution.OLED devices based on the DPF-NA film(with a doping concentration of 3%(mass fraction))has an electroluminescence(EL)peak located at 455 nm,with a small full width at half maximum(FWHM)of 26 nm.The CIE coordinates are(0.14,0.08),and the maximum external quantum efficiency(EQEmax)is 6.76%.
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