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Synthesis and Luminescent Properties of Blue Light Emitting Polymers Containing a 4,4’ or 3,3’-Linked Biphenyl Unit

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Author(s): Taek Ahn

Journal: Transactions on Electrical and Electronic Materials
ISSN 1229-7607

Volume: 13;
Issue: 6;
Start page: 317;
Date: 2012;
Original page

Keywords: Electroluminescence (EL) | Poly(p-phenylenevinylene) (PPV) | Biphenyl | Carbzaole | Wittig reaction

ABSTRACT
Poly[4,4’(3,3’)-biphenylenevinylene-alt-2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylene-vinylene], 4,4’(3,3’)-PBPMEHPPV,and poly[4,4’(3,3’)-biphenylenevinylene-alt-N-ethylhexyl-3,6-carbazolevinylene], 4,4’(3,3’)-PBPCAR-PPV, ofvarying effective conjugation lengths, were synthesized by the well-known Wittig condensation polymerizationbetween the appropriate biphenyl diphosphonium salts and dialdehyde monomers such as carbazole ordialkoxyphenyl dialdehyde. The conjugation lengths of the polymers were controlled by biphenyl linkages (4,4’ or 3,3’).The resulting polymers were highly soluble in common organic solvents and exhibited good thermal stability up to300℃. The synthesized polymers showed UV-visible absorbance and photoluminescence (PL) in the ranges of 314-400nm and 430-507 nm, respectively. Carbazole and 3,3’-biphenyl containing 3,3’-PBPCAR-PPV showed a blue PL peak at430 nm. A single-layer light-emitting diode was fabricated in a configuration of ITO/polymer/Al. Electroluminescence(EL) emission of 3,3’-PBPCAR-PPV was shown at 455 nm.
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