Organic electroluminescent element and process for its manufacture

A process for manufacturing an organic electroluminescent element, which comprises the steps of:

• providing a substrate,
• depositing an ITO layer composed of indium-tin oxide on said substrate,
• heating said ITO layer at a temperature of 250° C. or higher, and
• depositing a crystalline organic material layer on said ITO layer after the heating step.

A process for manufacturing an organic electroluminescent element, which comprises steps of:

• providing a substrate,
• depositing a first electrode of an ITO layer on said substrate, the ITO layer being composed of indium-tin oxide on said substrate,
• depositing a crystalline organic electroluminescent material layer of a copper phthalocyanine layer directly on said first electrode, and
• depositing a second electrode on said crystalline organic electroluminescent material layer,
• wherein said copper phthalocyanine layer of said crystalline organic electroluminescent material layer has a physical property that when said copper phthalocyanine layer is heated in a range of temperature at which said organic electroluminescent element is used, the change in the property of said copper phthalocyanine layer before and after said heating is within a predetermined range in that the change in the X-ray diffraction peak value of the (200) plane of said copper phthalocyanine layer parallel to said substrate is within ±25% with respect to said diffraction peak value before said heating.