Phenothiazine semiconducting polymer for light-emitting diodes

摘要

Phenothiazine alternating copolymer poly{4,8-bis(5-dodecylthiophene-2-yl) benzo1,2-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_2CO_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.