Patent ID: 7834540

Claim:
An organic electroluminescence (EL) device, comprising: a rear substrate; an organic electroluminescence element formed on the rear substrate, said organic electroluminescence element comprising a first electrode formed on the rear substrate, an organic layer formed on the first electrode and a second electrode formed on the organic layer; a front substrate coupled to the rear substrate via sealant to seal an internal space formed by the rear substrate and the front substrate, said internal space accommodating the organic electroluminescence element; and a transparent nanoporous oxide layer disposed in the internal space, the transparent nanoporous oxide layer produced by dispersing nanoporous oxide particles in a solvent to which an acid is optionally added to give a sol-state mixture, coating the sol-state mixture on the surface of the front substrate, and drying and heat-treating the coated mixture, the nanoporous oxide particles having an average particle diameter of not greater than 100 nm and having pores having an average pore diameter of not greater than 100 nm, the nanoporous oxide particles comprising at least one kind selected from the group consisting of lithium oxide (Li 2 O), sodium oxide (Na 2 O), potassium oxide (K 2 O), barium oxide (BaO), calcium oxide (CaO), magnesium oxide (MgO), lithium sulfate (Li 2 SO 4 ), sodium sulfate (Na 2 SO 4 ), calcium sulfate (CaSO 4 ), magnesium sulfate (MgSO 4 ), cobalt sulfate (CoSO 4 ), gallium sulfate (Ga 2 (SO 4 ) 3 ), titanium sulfate (Ti(SO 4 ) 2 ), nickel sulfate (NiSO 4 ), calcium chloride (CaCl 2 ), magnesium chloride (MgCl 2 ), strontium chloride (SrCl 2 ), yttrium chloride (YCl 2 ), copper chloride (CuCl 2 ), cesium fluoride (CsF), tantalum fluoride (TaF 5 ), niobium fluoride (NbF 5 ), lithium bromide (LiBr), calcium bromide (CaBr 3 ), cerium bromide (CeBr 4 ), selenium bromide (SeBr 2 ), vanadium bromide (VBr 2 ), magnesium bromide (MgBr 2 ), barium iodide (BaI 2 ) magnesium iodide (MgI 2 ), barium perchlorate (Ba(ClO 4 ) 2 ) and magnesium perchlorate (Mg(ClO 4 ) 2 ), the transparent nanoporous oxide layer having a thickness of about 0.1 to 12 μm.