Design and synthesis of new fluorene-based blue light emitting polymer containing electron donating alkoxy groups and electron withdrawing oxadiazole

A new polyfluorene-based copolymer having 2-ethylhexyloxy-5-methoxy-1,4-phenylene as an electron donating group and 2,5-diphenyl-oxadiazole as an electron withdrawing group was synthesized by the Suzuki coupling reaction. The obtained copolymer was characterized by1H-NMR,13C-NMR, and IR-spectroscopy. The weight average molecular weight (Mw) of the obtained polymer was 18,600 with a polydispersity index of 1.5. The maximum photoluminescence of the solution and film of the polymer was observed at 453 nm and 456 nm, respectively. A double-layer device with the configuration, ITO/PEDOT/copolymer/Al, emitted blue light at 460 nm.