Use of cross-linkable polyfluorene in the fabrication of multilayer polyfluorene-based light-emitting diodes with improved efficiency

abstract

The authors report the use of a cross-linkable polyfluorene to fabricate multilayer light-emitting diodes (LEDs), thereby avoiding the restriction to combine polymeric solutions in different solvents. In particular, we find that for LEDs fabricated with a hole-injection layer of poly(3,4-ethylenedioxythiophene) doped with polystyrene sulfonic acid (PEDOT), with magnesium cathodes and with poly(9,9-dioctylfluorene-alt-benzothiadiazole) (F8BT), as emissive layer, its electroluminescence efficiency increases from 2 to 5.5 cd/A upon insertion of the cross-linked polyfluorene between PEDOT and F8BT. This efficiency increase is attributed to an improvement of charge carrier balance within the F8BT emissive layer and a reduction of exciton quenching at PEDOT interface. (c) 2006 American Institute of Physics.

keywords

HOLE-TRANSPORT LAYERS; LUMINESCENCE PROPERTIES; ELECTRON-TRANSPORT; CONFINEMENT; COPOLYMER; PERFORMANCE; TRANSIENT; CHARGES; BLENDS

subject category

Physics

authors

Charas, A; Alves, H; Alcacer, L; Morgado, J

our authors

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