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Synthesis and Light-Emitting Properties of Polyfluorene Copolymers Containing a Hydrazone Derivative as a Comonomer

Cited 15 time in Web of Science Cited 14 time in Scopus
Authors
Hwang, Do-Hoon; Park, Moo-Jin; Lee, Ji-Hoon; Cho, Nam-Sung; Shim, Hong-Ku; Lee, Changhee
Issue Date
2004
Publisher
Elsevier
Citation
Synth. Met. 146 (2004) 145
Keywords
PolyfluoreneCopolymerHydrazoneLight-emitting diode
Abstract
Poly[9,9-bis(2′-ethylhexyl)fluorene-2,7-diyl] (PBEHF) and a series of fluorene copolymers containing a hydrazone comonomer, poly 9,9-bis(2′-ethylhexyl)fluorene-2,7-diyl-co-[aza(2,7-fluorene-9-ylidene)methyl]diphenylamine [poly(BEHF-co-FDPA)], were synthesized through Ni(0)-mediated polymerization. The synthesized polymers were characterized and their photophysical, electrochemical, and electroluminescent properties were investigated. Interestingly, the copolymer containing only 1% FDPA, poly(99BEHF-co-1FDPA), was found to exhibit photoluminescence (PL) emission that is significantly red-shifted with respect to that of the PBEHF homopolymer. All the copolymers exhibit PL emission maxima in the yellow region of the spectrum in the range from 530 to 540 nm, whereas the PBEHF homopolymer film produces maximum PL emission in the deep blue region at 424 nm. Light-emitting devices were fabricated in an ITO/PEDOT:PSS (50 nm)/polymers (80 nm)/Ca (50 nm)/Al (200 nm) configuration. The electroluminescence (EL) spectra of these devices consist of similar wavelengths to those found in the PL results; however, the EL devices constructed from the copolymers exhibited device performances that were significantly better than that of the device using the PBEHF homopolymer. This enhancement of performance is due to a more efficient charge carrier balance in the devices, which arises because of the effective exciton confinement (or charge carrier trapping) in the FDPA groups.
ISSN
0379-6779
Language
English
URI
http://hdl.handle.net/10371/13738
DOI
https://doi.org/10.1016/j.synthmet.2004.06.005
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College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Electrical and Computer Engineering (전기·정보공학부)Journal Papers (저널논문_전기·정보공학부)
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