There is an emission peak at 494 nm in the electroluminescence (EL) of PVK [poly(n-vinylcarbazole)]: Eu(o-BBA)(3)(phen) besides PVK exciton emission and Eu3+ characteristic emissions. Both the peaking at 494 nm emission and PVK emission influenced the color purity of red emission from Eu(o-BBA)(3)(phen). In order to restrain these emissions and obtain high intensity red emission, 4-(dicyanomethylene)-2-t-butyl-6-(1,1,7,7,-tetramethyljulolidy-9-enyl)-4 Hpyran (DCJTB) and Eu(o-BBA)(3)(phen) were co-doped in PVK solution and used as the active emission layer. The EL intensity of co-doped devices reached to 420 cd/m(2) at 20 V driving voltage. The chromaticity coordinates of EL was invariable (x = 0.55, y = 0.36) with the increase of driving voltage. For further improvement of EL intensity, organic-inorganic hybrid devices (ITO/active emission layer/ZnS/Al) were fabricated. The EL intensity was increased by a factor of 2.5 [(420 cd/m(2))/(168 cd/m(2))] when the Eu complex was doped with an efficient dye DCJTB, and by a factor of approximate to 4 [(650 cd/m(2))/(168 cd/m(2))] when in addition ZnS layer was deposited on such an emitting layer prior to evaporation of the Al cathode. (C) 2008 Published by Elsevier Ltd.