A new soluble poly(bithiophene)-co-3,4-di(methoxycarbonyl)methyl thiophene for LED

The regioregular polyalkylthiophene reported in this contribution has been electrochemically synthesised starting from a 3,4-bis-methoxyacetyl-terthiophene and carefully characterised. Photoluminescence analysis gave, both in solution and in films, very appreciable quantum yield values and LED devices realised with Ca cathode provided a value of red electroluminescence comparable with those of regioregular poly(3-alkylthiophene)s in the monolayer active material architecture, while if a blend with poly-N-vinylcarbazole and 2-(4-t-butyl-phenyl)-5-(4-biphenyl)-1,3,4-oxadiazole constitutes the active layer a white emission is observed. (C) 2002 Elsevier Science B.V. All rights reserved.