Abstract
Phenyleneethynylene motifs substituted by diphenylethenyl groups at both ends were prepared successfully by use of double elimination protocol of β-substituted sulfones for introducing phenyleneethynylene arrays followed by Wittig–Horner reaction for introducing diphenylethenyl moiety. The hybrid blue fluorophores exhibited strong emission even in the solid-state films ( Φ F ≧ 0.60) while, in CHCl 3 solution, incorporation of substituents on the central phenylene unit significantly enhanced emission efficiency up to Φ F = 0.57. The OLED devices with use of these blue fluorophores as an emitting material provided maximum external quantum efficiency of η ext = 2.4%.
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