ELECTROLUMINESCENCE FROM POLYPHENYLENE-BASED MATERIALS

Poly(phenylene) and its copolymers are a new family of electroluminesc ent materials with high thermal stability. Their photoluminescent and physical properties were modified in a controlled fashion by copolymer ization of the cyclohexadiene-1,2-diacetate monomer (DAC) with both vi nylbiphenyl (VBP) and vinyl-N-carbazole (VCZ). Polyphenylene thin film s exhibited green photoluminescence centered around 520 nm. The incorp oration of unaromatized comonomers into polyphenylene films blue-shift ed wavelengths of maximum photoluminescence centered around 500 nm for the DAC/VBP copolymer (8:2). Similarly, polyphenylene thin films exhi bited green electroluminescence centered around 505 nm for a device co nfiguration of Al(-)/polyphenylene/ITO(+). The incorporation of unarom atized comonomers into polyphenylene films blue-shifted wavelengths of maximum electroluminescence centered around 495 nm for a device confi guration of Al(-)/DAC-VBP copolymer (8:2)/ITO(+).