Electrical and electroluminescent properties of SnO2—copper‐phthalocyanine—Ag systems are presented. Thin films of copper phthalocyanine and Ag are deposited in a vacuum of 10−5 Torr. I–U, C–U, and electroluminescent studies are made. It is observed that the system behaves as a combination of two Schottky diodes with two different saturation currents and in the breakdown region it shows a SCL behaviour. The electroluminescent emission brigthness variation with applied voltage at constant frequency is found to follow the relation B = Bo exp (−b/V1/2) over wide range of frequencies. An attempt is also made to explain the voltage dependence of electroluminescent emission.

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