Organic electroluminescent element and process for its manufacture

An organic electroluminescent element comprising

• a substrate,
• an ITO layer composed of indium-tin oxide as a first electrode layer on said substrate,
• a crystalline organic material layer on said ITO layer, and
• a second electrode layer on said crystalline organic material layer,
• wherein said ITO layer has no peak bonded water at near 330° C. in the moisture-derived spectrum of the surface as measured by thermal desorption method.

An organic electroluminescent element comprising

• a substrate,
• a first electrode layer on said substrate, said first electrode layer being an ITO layer composed of indium-tin oxide,
• a crystalline organic metal complex layer on said first electrode layer,
• at least one organic material layer on said crystalline organic metal complex layer, said organic material layer comprising a luminescent layer, and
• a second electrode layer on said at least one organic material layer,
• wherein all of the organic materials composing said organic material layer(s) exhibit volatility during film formation by vacuum vapor deposition, and the change in the diffraction peak value of said organic metal complex layer based on X-ray diffraction after heating at 120° C. is within ±25% with respect to said diffraction peak value before said heating.

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,
• subjecting the surface of said ITO layer to treatment for desorption of the bonded water, and
• depositing a crystalline organic material layer on said ITO layer after said desorption treatment.

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,
• subjecting said ITO layer to heat treatment at a temperature of 250° C. or higher, and
• depositing a crystalline organic material layer on said ITO layer after said heat treatment.