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Vapor-deposited multilayer structure was used to fabricate multicolor-emitting organic electroluminescent diodes. Multicolor emission was made possible by two types of layer structure. In the Type I devices, opposite polarity of electric field was applied to alter emission colors. In the Type II devices, different strength and polarity of electric field was applied to alter emission colors.

The vacuum evaporation technique was used to fabricate electroluminescent (EL) diodes utilizing metal-free phthalocyanine. The analysis included the EL characteristics of the EL diodes depending upon metals of the cathode electrode and the diodes' characteristics. The results indicate that the infrared electroluminescence resulted from the radiative transition corresponding to the Q band of H2Pc.