Novel green light-emitting polyfluorenes containing dibenzothiophene-S,S-dioxide-arylamine derivatives

摘要: Abstract Green light-emitting polyfluorenes were synthesized by Suzuki polycondensation via introducing dibenzothiophene-S,S-dioxide-(di-)tri-phenylamine (G 1 and G 2 ) moieties dibenzothiophene-S,S-dioxide (SO) unit into the polyfluorene backbone, respectively. PF–SO–G copolymers show a high thermal stability moderate photoluminescence quantum yield in range of 20–40%. The lowest unoccupied molecular orbital (LUMO) levels reduce with increasing content SO polymers. efficient energy transfer from fluorene segment to or occurred PL process, EL emission peaked at about 510 nm was exclusively unit. Incorporating polymer backbone makes device performances improved. maximal luminous efficiency 9.0 cd A −1 CIE coordinates (0.27, 0.56) obtained for PF–SO15-G 5 based on single-layered ITO/PEDOT:PSS/polymer/CsF/Al. And polymers (PF–SO15-G5)s exhibited dramatic LE current densities, even though density 200 mA cm −2 , efficiencies only dropped 10%. lowers LUMO level, balances injection transportation both electron hole polymers, therefore improves performances. hole- electron-only devices that flux are well balanced, which demonstrates (PF-SO15-G5)s bipolar balanced charge carrier transport.