Organic el light-emitting element and manufacturing method thereof

Abstract

An organic EL light-emitting element is provided in which, by means of an organic material that is a oligomer with a molecular weight of 300-5000, an organic layer coated film 25 is formed in a high-definition pixel pattern in the openings 23a of insulation banks 23 that are formed with a hydrophilic material; a manufacturing method of said organic EL light-emitting element is also provided. The coated film 25 is formed by dropwise injection of a liquid composition containing an organic material oligomer.

1 . A top emission type organic electroluminescent light-emitting element comprising:
 a substrate,   a first electrode provided on a surface of the substrate,   an insulation bank formed to surround at least part of the first electrode,   one or more organic layers formed on the first electrode surrounded by the insulation bank, and   a second electrode having translucency formed on the one or more organic layers,   wherein the insulation bank has a forward tapered shape,   each of the one or more organic layers is a coated-type organic layer formed of an oligomer having a molecular weight of 300 or more and 5000 or less of an organic material, and the one or more organic layers comprise a light-emitting layer,   a thickness of the second electrode is 5 nm or more and 30 nm or less, and   light is taken out from a surface of the top emission type organic electroluminescent light-emitting element, the surface including the second electrode.   
     
     
         2 . The top emission type organic electroluminescent light-emitting element of  claim 1 , wherein an angle of a sidewall of the insulation bank to the first electrode is 10° or more and 80° or less. 
     
     
         3 . The top emission type organic electroluminescent light-emitting element of  claim 2 , wherein the insulation bank is formed to have a hydrophilic property and formed by a material selected from a group consisting of a silicon oxide, a silicon nitride, a silicon oxynitride, a polyimide resin, an acrylic resin, and a novolak-type phenol resin. 
     
     
         4 . The top emission type organic electroluminescent light-emitting element of  claim 1 , wherein the insulation bank is formed by a material having a hydrophilic property, and a contact angle of a surface of the insulation bank to water is 15° or more and 60° or less. 
     
     
         5 . The top emission type organic electroluminescent light-emitting element of  claim 4 , wherein the insulation bank is formed by a material selected from a group consisting of a silicon oxide, a silicon nitride, a silicon oxynitride, a polyimide resin, an acrylic resin, and a novolak-type phenol resin. 
     
     
         6 . The top emission type organic electroluminescent light-emitting element of  claim 1 , wherein the insulation bank is formed of a cured material of a photosensitive resin material. 
     
     
         7 . The top emission type organic electroluminescent light-emitting element of  claim 1 , wherein a polar functional group is formed on a surface of the insulation bank. 
     
     
         8 . The top emission type organic electroluminescent light-emitting element of  claim 1 , wherein a pinning position of the one or more organic layers is provided in a position such that a height of the pinning position is greater than a height of a thinnest part of the one or more organic layers, the pinning position being a contact point between the one or more organic layers and a sidewall of the insulation bank. 
     
     
         9 . The top emission type organic electroluminescent light-emitting element of  claim 1 , wherein an area of the first electrode surrounded by the insulation bank is 100 μm 2  or more and 2500 μm 2  or less. 
     
     
         10 . The top emission type organic electroluminescent light-emitting element of  claim 1 , wherein an area of the first electrode surrounded by the insulation bank is 100 μm 2  or more and 850 μm 2  or less. 
     
     
         11 . The top emission type organic electroluminescent light-emitting element of  claim 1 , wherein a height of the insulation bank from a surface of the first electrode is 1 μm or less. 
     
     
         12 . A method of manufacturing a top emission type organic electroluminescent light-emitting element comprising:
 forming a first electrode on a surface of a substrate,   forming an insulation bank to surround at least part of the first electrode,   forming one or more organic layers comprising a light-emitting layer on an area of the first electrode surrounded by the insulation bank, each of the one or more organic layers being formed of an oligomer having a molecular weight of 300 or more and 5000 or less of an organic material, and each of the one or more organic layers being formed as a coated-type organic layer, and   forming a second electrode having translucency on the one or more organic layers,   wherein the second electrode is formed to have a thickness of 5 nm or more and 30 nm or less,   each of the one or more organic layers is formed by supplying a droplet with a volume per one drop of 0.05 pL or more and 1 pL or less of a liquid composition comprising the oligomer of the organic material for the one or more organic layers using an ink-jet process, and   the top emission type organic electroluminescent light-emitting element is formed such that light is taken out from a surface of the top emission type organic electroluminescent light-emitting element, the surface of the top emission type organic electroluminescent light-emitting element including the second electrode.   
     
     
         13 . The method of manufacturing a top emission type organic electroluminescent light-emitting element of  claim 12 , wherein the insulation bank is formed such that an angle of a sidewall of the insulation bank to the first electrode is 10° or more and 80° or less. 
     
     
         14 . The method of manufacturing a top emission type organic electroluminescent light-emitting element of  claim 13 , wherein a step for forming the insulation bank is conducted by forming a layer of a material having a hydrophilic property selected from a group consisting of a silicon oxide, a silicon nitride, a silicon oxynitride, a polyimide resin, an acrylic resin, and a novolak-type phenol resin and by patterning the layer. 
     
     
         15 . The method of manufacturing a top emission type organic electroluminescent light-emitting element of  claim 12 , wherein the insulation bank is formed by a material having a hydrophilic property such that a contact angle of a surface of the insulation bank to water is 15° or more and 60° or less. 
     
     
         16 . The method of manufacturing a top emission type organic electroluminescent light-emitting element of  claim 15 , wherein a step for forming the insulation bank is conducted by forming a layer of a material selected from a group consisting of a silicon oxide, a silicon nitride, a silicon oxynitride, a polyimide resin, an acrylic resin, and a novolak-type phenol resin and by patterning the layer. 
     
     
         17 . The method of manufacturing a top emission type organic electroluminescent light-emitting element of  claim 12 , wherein the insulation bank is formed such that the area of the first electrode surrounded by the insulation bank is 100 μm 2  or more and 2500 μm 2  or less. 
     
     
         18 . The method of manufacturing a top emission type organic electroluminescent light-emitting element of  claim 12 , wherein the insulation bank is formed such that a height of the insulation bank from a surface of the first electrode is 1 μm or less.