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http://dx.doi.org/10.4313/TEEM.2012.13.6.317

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

Ahn, Taek (Department of Chemistry, Kyungsung University)

Publication Information

Transactions on Electrical and Electronic Materials / v.13, no.6, 2012 , pp. 317-321 More about this Journal

Abstract

Poly[4,4'(3,3')-biphenylenevinylene-alt-2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylene-vinylene], 4,4'(3,3')-PBPMEH-PPV, and poly[4,4'(3,3')-biphenylenevinylene-alt-N-ethylhexyl-3,6-carbazolevinylene], 4,4'(3,3')-PBPCAR-PPV, of varying effective conjugation lengths, were synthesized by the well-known Wittig condensation polymerization between the appropriate biphenyl diphosphonium salts and dialdehyde monomers such as carbazole or dialkoxyphenyl 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 to $300^{\circ}C$ . The synthesized polymers showed UV-visible absorbance and photoluminescence (PL) in the ranges of 314-400 nm and 430-507 nm, respectively. Carbazole and 3,3'-biphenyl containing 3,3'-PBPCAR-PPV showed a blue PL peak at 430 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.

Keywords

Electroluminescence (EL); Poly(p-phenylenevinylene) (PPV); Biphenyl; Carbzaole; Wittig reaction;

Citations & Related Records

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