The energy transfer and the luminescence properties of polyvinyl-carbazole (PVK) and oligomeric phenylenevinylene derivative (2,5-dodecyloxy-1,4-(biphenyl-enevinyl )phenyl)(DBVP)blend system were studied. The energy transfer between PVK and DBVP was investigated by the UV-vis absorption spectra, photoluminescent excitation (PLE) spectra and photoluminescent (PL) spectra of PVK/DBVP blend system. The electroluminescence (EL) properties of the blend system were investigated by characterization with the device ITO/PEDOT/PVK∶DBVP (w/w)/LiF/Al. The PL and EL spectra of PVK in the PVK/DBVP system were effectively quenched, which means the effective energy transfer between PVK and DBVP. Because PVK matrix acted as solid solvent, the emission performance of the blend system could be adjusted and improved by changing the ratio of PVK and DBVP. The luminescence efficiency is up to 1.06cd/A at 52cd/m2, when the weight ratio of PVK∶DBVP was 1:2 and the bright blue and green light emission were obtained when the ratio of PVK∶DBVP was changed from 20∶2 to 1∶2.