The emission spectra generated from the electroluminescence (EL) devices on CuPC (copper phthalocyanine) / TPD (N,N'-diphenyl-N,N'-di(m-tolyl)-benzidine) / PBD (2-(4-biphenylyl)-5(4-tert-butyl-phenyl)1,3,4-oxadiazole) had been studied. The EL devices emitted blue light two emission maxima, and one of them is about 50 mn bathochromic shifted from the photoluminescence maximum [2]. The bathochromic shift is caused by the new energy state generated under a high electric field [1].