Organic electroluminescent device and display

Abstract

An organic EL device and a display with excellent viewing-angle properties and high efficiency are provided. An organic electroluminescent device ( 1 ) comprising: a transparent electrode ( 12 ), a counter electrode ( 14 ) arranged opposite to the transparent electrode ( 12 ), one or more intermediate conductive layers ( 30, 32 and 34 ) and one or more organic emitting layers ( 20, 22, 24 and 26 ) arranged between the transparent electrode ( 12 ) and the counter electrode ( 14 ), wherein the difference between n a and n b is 0.2 or less when n a is the refractive index of the intermediate conductive layer ( 30 ) and n b is the refractive index of the organic emitting layer ( 20 ).

1 . An organic electroluminescent device comprising:
 a transparent electrode,   a counter electrode arranged opposite to the transparent electrode,   one or more intermediate conductive layers and one or more organic emitting layers arranged between the transparent electrode and the counter electrode,   wherein the difference between n a  and n b  is 0.2 or less when n a  is the refractive index of an intermediate conductive layer and n b  is the refractive index of an organic emitting layer,   the organic emitting layer comprises a hole injection layer, an organic luminescent medium and an electron injection layer, and   the intermediate conductive layer comprises a conductive metal oxide.   
   
   
       2 . An organic electroluminescent device comprising:
 a transparent electrode,   a counter electrode arranged opposite to the transparent electrode,   one or more intermediate conductive layers and a plurality of organic emitting layers sandwiching an intermediate conductive layer therebetween, the intermediate conductive layers and the organic emitting layers arranged between the transparent electrode and the counter electrode,   wherein the difference between n a , and n b  and/or n c  is 0.2 or less when n a  is the refractive index of an intermediate conductive layer, n b  is the refractive index of a first organic emitting layer and n c  is the refractive index of a second organic emitting layer, the intermediate conductive layer sandwiched between the first and second organic emitting layers,   the organic emitting layer comprises a hole injection layer, an organic luminescent medium and an electron injection layer, and   the intermediate conductive layer comprises a conductive metal oxide.   
   
   
       3 . The organic electroluminescent device according to  claim 1 , wherein the conductive metal oxide is MoO x . 
   
   
       4 . The organic electroluminescent device according to  claim 1 , wherein the conductive metal oxide is MoO x . 
   
   
       5 . The organic electroluminescent device according to  claim 1 , wherein the absorption coefficient (unit: 1/μm) of the intermediate conductive layer, the refractive index of which is n a , is 2.5 or less. 
   
   
       6 . A display comprising the organic electroluminescent device of  claim 1 . 
   
   
       7 . The organic electroluminescent device according to  claim 1 , wherein the absorption coefficient (unit: 1/μm) of the intermediate conductive layer, the refractive index of which is n a , is 2.5 or less. 
   
   
       8 . A display comprising the organic electroluminescent device of  claim 2 .