Synthesis and luminescent properties of blue light-emitting polymers containing high electron affinity and hole transporting group

Poly[(oxy-4,4'-octafluorobiphenyloxy)-1,4-phenylenevinylene-alt-2-methoxy-5 -(2-,4-phenylenevinylene)], POFB-MEH-PPV, poly[(oxy-4,4'-octafluorobiphenyl oxy)-1,4-phenylenevinylene-alt-9,9-n-dihexyl-2,7-fluorenediylvinylene], POF B-PF, and poly[(oxy-4,4'-octafluorobiphenyloxy)-1,4-phenylenevinylene-alt-N -ethylhexyl-3,6-carbazolevinylene], POFB-PK, were synthesized by the well k nown Wittig condensation polymerization. The resulting polymers were highly soluble in common organic solvents such as chloroform, 1,2-dichloroethane, and cyclohexanone and exhibited good thermal stability up to 300 degreesC. The synthesized polymers showed UV-visible absorbance and photoluminescenc e (PL) in the ranges of 350-385 nm and 460-490 nm, respectively. The carbaz ole or fluorene containing POFB-PK and POFB-PF showed blue PL peaks at 470 and 460 nm, respectively. The single-layer light-emitting diode (LED) was f abricated in a configuration of ITO/POFB-PK/Al. Electroluminescence (EL) ma ximum of POFB-PK was shown at 460 nm corresponding to the pure blue emissio n.