摘要: The energy transfer and the luminescent properties of PVK and four novel donor-pi-acceptor( D-pi-A) molecules(CKD, TKD, PKD, NKD) doped systems were investigated with the analysis of UV-Vis absorption spectra, photoluminescent excitation( PLE) spectra and photoluminescent ( PL) spectra. The electroluminescence(EL) properties of the blend system were studied via the characterization of the devices ITO/PE-DOT/PVK: D-pi-A omega-/Alq(3)/Al. The results demonstrate that by changing the donor moieties of D-pi-A molecule, the band gap of D-pi-A molecules can be adjusted. Meanwhile the fluorescence quantum efficiency varies significantly with the stereostructure of donor moieties of D-pi-A molecules. Both the PL and EL spectra show that the energy transfer between PVK and D-pi-A molecules occurs effectively. The emission performance of the blend system could be improved with changing the dopant ratio of PVK and D-v-A molecules. The power efficiency of the device is up to 1.75 cd/A at 729.1 cd/m(2), when the dopant mass fraction between PVK and TKD is 6.0%.