Synthesis and Optoelectric Properties of Fluorene-Alt-Benzene Organic Phosphorescent Polymers Containing Pendent Cyclometalated Iridium Complex

A series of novel phosphorescent polymers consisting of fluorene- alt -benzene as building block in the main chain and cyclometalated iridium complex as the pendent in the branch were synthesized by coupling polymerization. All of these resulting polymers presented a good thermal stability, an intense absorption in the region of 300–400 nm and a bright blue emission in solution. On contrary, the polymers exhibited dual emission spectra originated from the backbones and iridium complex unit in the neat film. Polymer organic light-emitting diodes employing these polymers as the single emissive layer with the configuration of ITO/PEDOT : PSS (50 nm)/phosphorescent polymer (45 nm)/LiF (0.5 nm)/Al (150 nm) were fabricated. The devices revealed a maximum brightness 43 cd/m 2 with a low molar concentration of iridium complex (1%).