Poly(Phenylene vinylene) And Poly(Naphthalene vinylene) Derivatives for Use in Organic Light-Emitting Diodes (OLEDs)

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2014-08

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Abstract

Organic light-emitting diodes (OLEDs) have found application in displays and lighting. The focus of this dissertation is on the synthesis of unique poly(phenylene vinylene) (PPV) derivatives and similarly structured conjugated polymers as active layers in OLED devices. One element analyzed in this research was the effect of the substitution pattern of the phenylene units, whether para- or meta-linked. The resulting set of devices revealed that meta derivatives with alkoxy substitution on the meta-linked rings had improved performance over para-linked derivatives. The role of oxygen in the solubilizing sidechains of conjugated polymers was investigated. When oxygen is removed from these sidechains, the solubility and device performance are adversely affected. Incorporation of oxygen in the chain in a position further from the aromatic ring improves solubility, potentially improving device performance. An additional oxygen incorporated in the sidechain for a total of two ether moieties, further increases solubility, but impairs device performance due to poor film formation. Finally the combination of PPV with poly(naphthalene vinylene) (PNV) in the form of alternating copolymers showed improved OLED device performance over PNV homopolymers. The improved solubility of these copolymers allowed for the analysis of the effect of alky and alkoxy substitutents in PNV derivatives on electroluminescent characteristics.

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Keywords

Alkyl substitution, Horner-Emmons polycondensation, Light-emitting polymer, Organic light-emitting diode, Poly(naphthalene vinylene), Poly(phenylene vinylene), PPV

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