Phenothiazine Semiconducting Polymer for Light‐Emitting Diodes

Abstract

Abstract Phenothiazine alternating copolymer poly{4,8‐bis(5‐dodecylthiophene‐2‐yl)benzo[1,2‐ b :4,5‐ b′ ]dithiophene‐ alt ‐(10‐decylphenothiazine)} ( P1 ) is synthesized by Stille coupling polymerization. The synthesized polymer has an electrochemical bandgap of 1.61 eV and displays good photoluminescence with a quantum yield of 63.3%. The polymer is tested as a light‐emitting material in polymeric light‐emitting diodes (PLEDs) with a device structure of indium tin oxide (ITO)/poly(3,4‐ethylenedioxythiophene) poly(styrenesulfonate) (PEDOT:PSS)/polymer/Cs 2 CO 3 /Al. The devices display an orange‐yellow electroluminescence (Commission Internationale de l'Eclairage (CIE) 1931 color‐space chromaticity diagram: x = 0.5355 and y = 0.4611) with a maximum brightness of 3130 cd m −2 at an applied voltage of 10 V.