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High photoluminescence efficiency in substituted polythiophene aggregates

2003; Elsevier BV; Volume: 139; Issue: 2 Linguagem: Inglês

10.1016/s0379-6779(03)00171-1

1879-3290

A. Bolognesi, Alberto Giacometti Schieroni, Chiara Botta, M. Marinelli, Raniero Mendichi, R. Rolandi, Annalisa Relini, Olle Inganäs, M Theandher,

Organic Light-Emitting Diodes Research

In this paper we discuss the optical (absorption and photoluminescence) and solvatochromic properties of a newly synthesized alternating copolymer based on poly(3-alkylthiophene) structure. In this copolymer an unsubstituted thiophene ring is linked to a 3-alkyl-substituted thiophene, the two repeating units being alternated in the copolymer chains. Moreover, a bulky group, THP, with high steric hindrance has been introduced in the side chain. This copolymer, designed to preserve the backbone planarity of polythiophenes and to prevent a close packing arrangement through the non-regioregular insertion of the bulky substituted monomer, shows high PL quantum yield in the solid state and in solution aggregates. The electroluminescence of this copolymer is reported for a simple single layer device.