The Eu complex, Eu(TTA)(3)(TPPO) [tris-(4,4,4-trifluoro-1-(2-thienyl)butane-1,3-dionate)-triphenyl phosphine oxide europium(III)] is known as the sharp red electroluminescent organic material at the wavelength of 615nm, but its luminance is quite low, In this study, we improved it's electrical and optical characteristics using the hole blocking layer (HBL), BCP [2,9-dimethyl-4,7-diphenyl- 1,10-phenanthroline]. The device with a structure of ITO/TPD/Eu(TTA)(3)(TPPO)/BCP/Alq(3)/Li:Al/Al was fabricated and its photouminescent and electroluminescent characteristics were investigated. It was found that the BCP layer with a thickness of 6nm can block the holes from Eu complex efficiently to improve the EL characteristics of the device. Details on the electrical properties of these structures will be also discussed.