The preparation and electrical or optical characteristics of blue-green emitting powder type electroluminescent device(P-ELD) are described. In V-I and Y-L characteristics, current and luminance are increased with increasing frequency and voltage. Luminance was shown 840 cd/$ extrm{m}^2$ at operating condition of 20 kHz, 150 V It can be explained by eqivalent circuit of P-ELD.