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Electrophosphorescent Polyfluorenes Containing Osmium Complexes in the Conjugated Backbone
Author(s) -
Chien ChenHan,
Liao SongFu,
Wu ChenHao,
Shu ChingFong,
Chang ShengYuan,
Chi Yun,
Chou PiTai,
Lai ChengHsuan
Publication year - 2008
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.200701137
Subject(s) - materials science , polyfluorene , copolymer , electroluminescence , conjugated system , osmium , oled , polymer , photochemistry , quantum efficiency , covalent bond , trifluoromethyl , green light , phosphorescence , brightness , polymer chemistry , optoelectronics , nanotechnology , fluorescence , catalysis , blue light , organic chemistry , ruthenium , chemistry , optics , composite material , alkyl , layer (electronics) , physics
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 38 000 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.