Defect-free Poly(9,9-bis(2-ethylhexyl)fluorene-2,7-vinylene) for Polymer Light-Emitting Diode (PLED) Devices
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The π-conjugated light-emitting polymer poly(9,9-bis(2-ethylhexyl)fluorene-2,7-vinylene) (PEHFV), was synthesized in defect-free form via Horner-Emmons coupling. The structure and properties of the polymer were characterized by 1H NMR, 13C NMR, UV-vis, photoluminescence (PL), and electroluminescence (EL) spectroscopies as well as gel permeation chromatography (GPC) and thermogravimetric analysis (TGA). The weight-average molecular weight (Mw) and polydispersity of the PEHFV were 34,000 g/mol and 2.3, respectively. The UV-vis spectra showed absorption maxima at 425 and 452 nm, and the PL emission spectra showed a maximum at 505 nm with a shoulder at 541 nm. The polymer was soluble in common organic solvents and easily spin-coated on indium-tin oxide (ITO)-coated glass substrates. A double-layer light-emitting device with an ITO/PEDOT:PSS/PFV/Al configuration was fabricated. The turn-on voltage for the PEHFV device was observed at 3.0 V.
KeywordsPolymer light-emitting diode (PLED) Poly(fluorene vinylene)(PFV) Defect-free Electroluminescence
This research was supported by Chiang Mai University, the Reverse Brain Drain Project (RBD), The National Science and Technology Development Agency, Ministry of Science and Technology, Thailand, and the Center for Innovation in Chemistry (PERCH-CIC). Additional support for work performed at the University of Houston was provided by the Texas Center for Superconductivity and the Robert A. Welch Foundation (Grant E-1320). David L Carroll acknowledges funding from AFOSR grant number FA9550-04-1-0161.
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