Abstract
We report emission from a series of aryl substituted polyacetylenes poly(phenylacetylene) (PPA), poly( p-ethynylphenylacetylene) (PEPA), poly( p-phenylethynylphenylacetylene) (PPEPA), and poly[ p–(2–thiophenylethynyl)phenylacetylene] (PTEPA). These polymers are readily soluble, easily processable from organic solvents, and stable up to 200°C either in air or in nitrogen according to thermogravimetric analysis. Single layer light-emitting diodes using PPA, PEPA, PPEPA, and PTEPA as an emissive layer were fabricated. The effects of substituted groups on UV–vis absorption, photoluminescence and electroluminescence spectra of the polymers are discussed.
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