Phosphorescent dyes may lead to more efficient electroluminescent devices, since triplets should be formed in a 3-fold excess compared to singlets. Efficient devices are presented here that have been constructed using phosphorescent dye-doped layers as both the electron transporting and emitting layer. Triplet energy transfer from the host Ir(ppy)(3) to the red phosphorescent dopant PtOX (see Figure) was observed directly.