Abstract: There is provided a material for an anode buffer lay which permits the use of an organic solvent as a solvent an anode buffer layer-forming solution, and is capable forming an anode buffer layer that does not dissolve even win coated with a luminescent layer-forming material solution containing an organic solvent as a solvent, and which is capable of producing an organic EL element having high electrical power efficiency and long life.

Abstract: A method of producing the organic light emitting element which includes laminating a first substrate, an anode, an organic compound layer and a light reflective cathode in this order. The organic compound layer includes a light emitting layer, and the method of forming the light reflective cathode includes forming an Al thin layer having a thickness of 0.1 to 10 nm in contact with the organic compound layer and laminating a metal layer having a thickness of 70 nm to 10 ?m on one side of the Al thin layer opposite the side in contact with the organic compound layer. The Al thin layer forming step is carried out in a vacuum of 1×10?8 to 1×10?2 Pa, and is kept in a vacuum of 1×10?8 to 1×10?2 Pa until the metal layer is laminated in contact with the Al thin layer by the metal layer laminating step.

Abstract: There is provided a material for an anode buffer layer which permits the use of an organic solvent as a solvent of an anode buffer layer-forming solution, and is capable of forming an anode buffer layer that does not dissolve even when coated with a luminescent layer-forming material solution containing an organic solvent as a solvent, and which is capable of producing an organic EL element having high electrical power efficiency and long life.

Abstract: [Problems] To provide processes that can increase the work function of electrodes by simple procedures, and organic EL devices that have an anode of high work function and a quality emitting surface showing excellent luminous properties (luminous efficiency, life) without uneven brightness or defects, and are free of leakage current. [Means for solving problems] A process for treating an electrode surface of the invention includes a contact step of bringing an electrode formed of a metal oxide or a metal into contact with an alkaline solution of a compound having an Si—O bond. An organic EL device according to the invention includes a metal oxide or metal anode that has been surface-treated by the process, and an emitting layer and a cathode laminated on the anode in this order.