NOVELTY - An organic electro-optical device (10) has an organic electro-optical compound (40) sandwiched between an anode layer (30) and a cathode layer (50). The cathode layer contains an electron-injecting metal having low work-function for injecting electrons into the organic electro-optical compound. The cathode layer is sealed from moisture via a sealing layer (60) deposited on the cathode layer. The sealing layer has a getter layer for consuming water, an organic planarization layer for encapsulating contamination particles on the cathode layer and an inorganic barrier layer.    USE - Organic electro-optical device is used for light source, display device and solar cell (all claimed).    ADVANTAGE - The organic electro-optical device has excellent durability.    DETAILED DESCRIPTION - An organic electro-optical device has an organic electro-optical compound sandwiched between an anode layer and a cathode layer. The cathode layer contains an electron-injecting metal having low work-function for injecting electrons into the organic electro-optical compound. The cathode layer is sealed from moisture via a sealing layer deposited on the cathode layer. The sealing layer has a getter layer for consuming water, an organic planarization layer for encapsulating contamination particles in or on the cathode layer and an inorganic barrier layer. The getter layer is sandwiched between the cathode layer and the organic planarization layer. The getter layer contains metal having low work-function such as alkaline earth metal and its oxide. The organic planarization layer contains organic compound. The inorganic barrier layer contains silicon nitride (SixNy), silicon oxynitride (SixOyNz), aluminum oxide (AlxOy) or silicon carbide (SixCy), where x, y and z are 0-4. An INDEPENDENT CLAIM is included for method for producing sealing layer.    DESCRIPTION OF DRAWING(S) - The drawing shows the cross-sectional view of the organic electro-optical device.    Organic electro-optical device (10)    Anode layer (30)    Organic electro-optical compound (40)    Cathode layer (50)    Sealing layer (60)