Highly polarized white-light emission from a single copolymer based on fluorene

Polarized white-light emission was realized from a single copolymer with green and red-light-emitting chromophores incorporated into the blue-light-emitting poly(9,9-dioctylfluorene) backbone through intrachain energy transfer. Based on the good thermal stability and nematic liquid crystalline state of the copolymer, the emissive layer spin coated on a rubbed poly(3,4-ethylene dioxythiophene):poly(styrenesulfonate) layer was aligned under thermal treatment at a temperature of 180 °C for 5 min. The polarized white-light emission was stable with a Commission Internationale de L’Eclairage coordinates of (0.33, 0.35). A high polarization ratio of up to 24 with a luminance of 419 cd/m2 at voltage of 15 V was achieved.