Electroluminescence and charge photogeneration in poly(9,9-dihexadecylfluorene-2,7-diyl) and its blends

Photoluminescence, electroluminescence (EL), charge photogeneration and transport were studied in poly(9,9-dihexadecylfluorene-2,7-diyl) (PFC16), poly[(2,5-dihexadecyl-1,4-phenylene)(1,4-phenylene)] (PPPC16) and their blends. Blending of PFC16 with PPPC16 led to a significant improvement of the EL efficiency and stability compared with the devices fabricated from the neat polymers. Efficient blue and white light-emitting devices (LEDs) were fabricated using the blends. The increase in the EL efficiency was attributed to modification of the charge injection, transport and recombination properties in the blend.