Synthesis of Dendritic Oligo-Spiro(fluorene-9,9(-xanthene) Derivatives with Carbazole andFluorene Pendants and their Thermal, Optical,and Electroluminescent Properties

摘要

Two novel spiro-configured ter(arylene-ethynylene) derivatives, TSF-Cz and TSF-F, have beendesigned and synthesized using spiro(fluorene-9,90-xanthene) (SFX) as building blocks, introducinga hole-transporting carbazole and a fluorene chromophore as the peripheral functionalgroup into the backbone through an oxygen atom. The two well-defined oligomers possessgood solubility, film-forming quality, and high Tg’s at 140 and 126 8C, respectively. In addition,these oligomers exhibit blue photoluminescence (PL) emission both in solution and solidstates. The double-layereddevices fabricated using thetwo materials as the emittershow a sky-blue emission witha brightness and a current efficiencyof 7 613 cd m2 and1.11 cd A1 for TSF-Cz, and1 507 cd m2 and 0.36 cd A1for TSF-F, respectively.