Synthesis and device performance of an oxygen-interrupted bipolar polymer host with carbazole and triphenylphosphine oxide in the main chain

摘要

A novel bipolar polymer host PC10CzPO, carrying hole-transporting carbazole and electron-transporting triphenylphosphine oxide units in the oxygen-interrupted main chain, was synthesized and characterized. In addition to its excellent thermal stability and miscibility with phosphors, PC10CzPO is also reported to have a triplet energy (E-T) as high as 2.83 eV due to oxygen-interrupted -conjugation, ensuring that PC10CzPO can be used as a suitable host material. The PC10CzPO-based phosphorescent devices were investigated and compared, while doping with typical blue phosphor {iridium(III)bis(4,6-difluorophenyl)pyridinato-N, C2picolinate, FIrpic)}, green phosphor {tris2-(p-tolyl)pyridineiridium(III), Ir(mppy)(3)}, and red phosphor bis(1-phenyl-isoquinoline-C2,N)(acetylacetonato)iridium(III), Ir(piq)(2)acac. As a result, the FIrpic-based blue devices showed better device performances than those of red and green devices, which was ascribed to more effective energy transfer. This indicates that the choice of proper host and dopant emitters to fabricate phosphorescent polymer light emitting diodes (PhPLED) is a simple and effective approach to optimize device performances. (c) 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 44461.