Control of conjugation length and enhancement of fluorescence efficiency of poly(p-phenylenevinylene)s via post-halogenation

Li, Yuning, Vamvounis, George, and Holdcroft, Steven (2002) Control of conjugation length and enhancement of fluorescence efficiency of poly(p-phenylenevinylene)s via post-halogenation. Chemistry of Materials, 14 (3). pp. 1424-1429.

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Abstract

Post-functionalization of poly(p-2,5-dihexyloxy-phenyelenevinylene) (DHO-PPV) was studied using N-bromosuccinimide (NBS) and N-chlorosuccinimide (NCS) in CHCl3 and CHCl3/AcOH to control the color of fluorescence emission and to enhance emission efficiency. It was found that in addition to electrophilic substitution on phenylene rings, halogen and succinimide (in CHCl3) and acetate groups (in CHCl3/AcOH) add across the main chain vinylene groups. With low NXS/PPV reaction ratios (0.1-0.35), where X = Br or Cl, the resulting polymers show poor solubility, a red shift of the absorption maximum, and a decrease in the solid-state fluorescence efficiency (Phi(fl)), which are explained on the basis of enhanced interchain interactions. For NXS/PPV reaction ratios between 0.5 and 0.75, the solubility of polymers was significantly improved and Phi(fl) was enhanced by up to 150% due to exciton confinement and a reduction in chain aggregation. For NXS/PPV reaction ratios >0.75, Phi(fl) decreased dramatically because of an increasing loss of pi-conjugation.

Item ID: 32735
Item Type: Article (Research - C1)
ISSN: 1520-5002
Funders: Natural Sciences and Engineering Research Council of Canada
Date Deposited: 14 Oct 2015 02:47
FoR Codes: 03 CHEMICAL SCIENCES > 0305 Organic Chemistry > 030599 Organic Chemistry not elsewhere classified @ 100%
SEO Codes: 85 ENERGY > 8505 Renewable Energy > 850504 Solar-Photovoltaic Energy @ 100%
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