Ks. Whitehead et al., Highly polarized blue electroluminescence from homogeneously aligned filmsof poly(9,9-dioctylfluorene), APPL PHYS L, 76(20), 2000, pp. 2946-2948
Homogeneous alignment of poly(9,9-dioctylfluorene) films on thin layers of
rubbed precursor-route poly(p-phenylenevinylene) allows the construction of
light-emitting diodes that emit highly polarized blue light (lambda(em)=45
8 nm). The rubbed poly(p-phenylenevinylene) acts as an effective hole-injec
ting alignment layer. Annealing of poly(9,9-dioctylfluorene) in its nematic
phase followed by rapid quenching orients the polymer as a glassy monodoma
in on the alignment layer and gives devices with a polarization ratio of 25
:1 and a luminance of up to 250 cd/m(2). (C) 2000 American Institute of Phy
sics. [S0003-6951(00)04620-9].