Synthesis and color tuning of new fluorene-based copolymers

Nam Sung Cho, Do Hoon Hwang, Jeong Ik Lee, Byung Jun Jung, Hong Ku Shim

Research output: Contribution to journalArticlepeer-review

136 Scopus citations

Abstract

A series of copolymers, poly{9,9-bis(2′-ethylhexyl)fluorene-2,7-diyl-co-2,5-bis(2-thienyl-1-cyanov inyl)-1-(2′-ethylhexyloxy)-4-methoxybenzene-5″, 5‴-diyl} (PFTCVB), were synthesized from the monomers 2,7-dibrome-9,9-bis(2′-ethylhexyl)fluorene and 2,5-bis(2-(5′-bromothienyl)-1-cyanovinyl)-1-(2″-ethylhexyloxy)-4-met hoxybenzene (BTCVB) through the Ni(0)-mediated polymerization. The copolymers were characterized using FT-IR spectroscopy, UV-vis spectroscopy, TGA, photoluminescence (PL) and electroluminescence (EL) spectroscopy, elemental analysis, and molecular weight studies. The synthesized copolymers showed an absorption maximum at about 380 nm, and between 425 and 600 nm the absorption increased with increasing fraction of thiophene-containing monomer 4 (BTCVB). In PL, the emission maxima of the copolymers were red-shifted as the fraction of BTCVB increases, despite the copolymers showing little variation in UV-vis absorption characteristics. Light-emitting devices were fabricated in an ITO (indium-tin oxide)/PEDOT/polymer/LiF/Al configuration. The EL spectra showed similar emissions to the PL results, and the copolymer containing 15 mol % of BTCVB showed bright-red emission.

Original languageEnglish
Pages (from-to)1224-1228
Number of pages5
JournalMacromolecules
Volume35
Issue number4
DOIs
StatePublished - 12 Feb 2002

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