Organic electroluminescent device and method of manufacturing the same
View Patent ↗An organic electroluminescent device and its method of manufacturing are provided. The organic electroluminescent device may include a rear substrate, an organic electroluminescent unit including a first electrode, an organic film, and a second electrode stacked on a surface of the rear substrate. It may also include a front substrate joined to the rear substrate to seal an internal space in which the organic electroluminescent unit is disposed. It may also include a porous oxide layer composed of a porous silica and a metal compound on a lower surface thereof. A device constructed according to the present invention may have excellent adsorption of moisture and oxygen, thereby increasing the life span of the device.
1. An organic electroluminescent device, comprising:
a first substrate;
an organic electroluminescent unit comprising a first electrode, an organic film, and a second electrode stacked on a surface of the first substrate;
a second substrate joined to the first substrate, substantially sealing an internal space in which the organic electroluminescent unit is disposed; and
a porous oxide layer comprising a porous silica and a metal compound arranged directly on an interior surface of the second substrate, the porous oxide layer adhering itself directly to the inner surface of the second substrate, and
wherein the porous oxide layer has a thickness of about 0.1 to about 12 μm,
wherein the metal compound of the porous oxide layer is one or more selected from the group consisting of alkaline metal oxide, alkaline earth metal oxide, metal halide, metal sulfate, and metal perchlorate,
wherein the alkaline metal oxide comprises one or more material selected from the group consisting of lithium oxide (Li 2 O), sodium oxide (Na 2 O), potassium oxide (K 2 O), the alkaline earth metal oxide is barium oxide (BaO), calcium oxide (CaO), and magnesium oxide (MgO);
wherein the metal sulfate comprises one or more material selected from the group consisting of 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 ), and nickel sulfate (NiSO 4 );
wherein the metal halide comprises one or more material selected from the group consisting of 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 (Bal 2 ), and magnesium iodide (Mgl 2 );
wherein the metal perchlorate comprises one or more material selected from the group consisting of barium perchlorate (Ba(ClO 4 ) 2 ) and magnesium perchlorate (Mg(ClO 4 ) 2 );
wherein the metal compound of the porous oxide layer is confined in a network of the porous silica; and
wherein the porous silica network comprises a silica frame and a plurality of absorption holes.
2. The organic electroluminescent device of claim 1 , wherein the porous oxide layer has a two-layer structure comprising a porous silica layer and a metal compound layer.
3. The organic electroluminescent device of claim 2 , wherein the metal compound of the metal compound layer is CaO.
4. The organic electroluminescent device of claim 1 , wherein exactly one of the first electrode and the second electrode is a transparent electrode and the other is a reflective electrode.
5. The organic electroluminescent device of claim 1 , wherein the adsorption holes have a diameter of 0.1 to 100 nm.
6. The organic electroluminescent device of claim 1 , wherein the adsorption holes have a diameter of 10 to 30 nm.
7. The organic electroluminescent device of claim 1 , wherein a weight ratio of the porous silica to the metal compound is in a range from 0.1:1 to 1:1.