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Browsing by Author "Liao, Song-Fu"

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    Electrophosphorescent polyfluorenes containing osmium complexes in the conjugated backbone
    (2008-05-09)
    Chien, Chen-Han
    ;
    Liao, Song-Fu
    ;
    Wu, Chen-Hao
    ;
    Shu, Ching-Fong
    ;
    Chang, Sheng-Yuan
    Electrophosphorescent copolymers have been synthesized by covalent bonding of a red-emitting osmium complex Os(bpftz), which contains two 3-trifluoromethyl-5-(4-tert-butyl-2-pyridyl)triazolate (bpftz) cyclometalated ligands, into the backbone of a bipolar polyfluorene (PF) copolymer. Employing these copolymers, a highly efficient red polymer light-emitting diode has been realised that has an external quantum efficiency of 18.0%, a maximum brightness of 38000 cd m(-2), and an emission centered at 618 nm. In addition, after incorporating appropriate amounts of green-emitting benzothiadiazole (BT) and the aforementioned Os(bpftz) into the bipolar PF, an efficient white-light electroluminescent polymer is obtained that displays simultaneous blue, green, and red emissions.