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 oligomeric, an organic layer coated film 25 is formed in a high-definition pixel pattern in a 100-2500 μm2 area; 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 in openings of insulation banks that are formed at a height of 0.5-1 μm.

1 . An 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 formed on the one or more organic layers,   wherein the insulation bank has a forward tapered shape,   an area of the first electrode surrounded by the insulation bank is 100 μm 2  or more and 850 μm 2  or less,   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.   
     
     
         2 . The organic electroluminescent light-emitting element of  claim 1 , wherein the second electrode has translucency, and the organic electroluminescent light-emitting element is a top emission type organic electroluminescent light-emitting element such that light is taken out from a surface of the organic electroluminescent light-emitting element, the surface including the second electrode. 
     
     
         3 . The organic electroluminescent light-emitting element of  claim 1 , wherein a height of the insulation bank from a surface of the first electrode is 0.5 μm or more and 1 μm or less. 
     
     
         4 . The organic electroluminescent light-emitting element of  claim 1 , wherein a surface of the insulation bank is formed to have a hydrophilic property. 
     
     
         5 . The organic electroluminescent light-emitting element of  claim 1 , wherein a thickness of the second electrode is 5 nm or more and 30 nm or less. 
     
     
         6 . A method of manufacturing an 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 on the one or more organic layers,   wherein the insulation bank is formed so that the area of the first electrode surrounded by the insulation bank is 100 μm 2  or more and 850 μm 2  or less, and   each of the one or more organic layers is formed by supplying a droplet of a liquid composition comprising the oligomer of the organic material using an ink-jet process.   
     
     
         7 . The method of manufacturing an organic electroluminescent light-emitting element of  claim 6 , wherein the second electrode is formed to have a thickness of 5 nm or more and 30 nm or less. 
     
     
         8 . The method of manufacturing an organic electroluminescent light-emitting element of  claim 6 , wherein a volume per one drop of the droplet of the liquid composition dropped using the ink-jet process in the step for forming each of the one or more organic layer is 0.05 pL or more and 1 pL or less. 
     
     
         9 . The method of manufacturing an organic electroluminescent light-emitting element of  claim 6 , wherein the insulation bank is formed to have a height from a surface of the first electrode of 0.5 μm or more and 1 μm or less.