Effect of polymer chain structure on electroluminescence of poly(4-diphenylaminostyrene)/Alq3 blend films

Abstract

Three types of poly(4-diphenylaminostyrene) (PDAS) having different polymer chain structures were prepared by living anionic polymerization, and the electroluminescence of PDAS/tris(8-hydroxyquinoline) aluminum (Alq3) blend films was examined to obtain basic information of PDAS for application to organic light-emitting diodes (OLEDs). The hole drift mobility of PDAS was on the order of 10−4 to 10−5 (cm2 V−1 s−1) with a negative slope, and it increased with an increase in the syndiotactic configuration in the polymer chain. The current density, turn-on voltage and brightness were also improved with an increase in the syndiotactic configuration of PDAS. Three types of poly(4-diphenylaminostyrene) (PDAS) having different polymer chain structures were prepared by living anionic polymerization, and the electroluminescence of PDAS/tris(8-hydroxyquinoline) aluminum (Alq3) blend films was examined. The hole drift mobility of PDAS increased with an increase in the syndiotactic configuration. The current density, turn-on voltage and brightness were also improved with an increase in the syndiotactic configuration of PDAS.