Highly efficient solution-processed white organic light-emitting diodes based on novel copolymer single layer

► White-emitting polymer for solid state lighting. ► Single component, single-layer, solution processed devices. ► Blue-emitting poly(fluorine-alt-phenylene) containing co-monomers bearing red-emitting 1,8-naphtalimide pendant groups. ► Efficiency of 9.42 Cd/A for the device with a fraction x = 0.0005 of monomers with chromophore, at low driving current, 47 μA.