Electrophosphorescent polyfluorenes containing osmium complexes in the conjugated backbone

Resource
Advanced Functional Materials 18 (9): 1430-1439
Journal
Advanced Functional Materials
Journal Volume
18
Journal Issue
9
Pages
1430-1439
Date Issued
2008
Author(s)
Chien, Chen-Han
Liao, Song-Fu
Wu, Chen-Hao
Shu, Ching-Fong
Chang, Sheng-Yuan
Chi, Yun
Lai, Cheng-Hsuan
DOI
URI
Abstract
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. © 2008 WILEY-VCH Verlag GmbH & Co. KGaA.
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