Improved electroluminescence performance of poly (3-alkylthiophenes) having a high head-to-tail (HT) ratio

Abstract

Light-emitting diodes are fabricated from regioregular and non-regioregular poly(3-hexylthiophenes). The regioregular polymer has a higher head-to-tail (HT) ratio than non-regioregular polymer. It is shown that the electroluminescent device containing high HT ratio polymer perform significantly better than polymers with a low HT ratio. Photoluminescence data of both polymers are also reported.