Organic electroluminescent device

Abstract

An organic electroluminescent device including a first electrode ( 11 ), a second electrode ( 16 ), and an organic material layer ( 20 ) interposed therebetween; the second electrode ( 16 ) being light-transmissible; the organic material layer ( 20 ) having a structure wherein a first carrier transporting layer ( 12 ), an organic emitting layer ( 14 ) and a second carrier transporting layer ( 15 ) are stacked in this order; the organic material layer ( 20 ) including a conductive light-reflecting layer ( 13 ) therein; and the part between the light-transmissible second electrode ( 16 ) and the light-reflecting layer ( 13 ) forming an optical resonator enhancing light emitted from the organic emitting layer ( 14 ).

1 . An organic electroluminescent device comprising:
 a first electrode,   a second electrode, and   an organic material layer interposed therebetween;   the second electrode being light-transmissible;   the organic material layer having a structure wherein a first carrier transporting layer, an organic emitting layer and a second carrier transporting layer are stacked in this order;   the organic material layer comprising a conductive light-reflecting layer therein; and   the part between the light-transmissible second electrode and the light-reflecting layer forming an optical resonator enhancing light emitted from the organic emitting layer.   
   
   
       2 . The organic electroluminescent device according to  claim 1  wherein the part between the first electrode and the second electrode and/or the part between the first electrode and the light-reflecting layer forms an optical resonator enhancing light emitted from the organic emitting layer. 
   
   
       3 . The organic electroluminescent device according to  claim 1  or  2  wherein the light-reflecting layer is positioned between first carrier transporting layers. 
   
   
       4 . The organic electroluminescent device according to  claim 3  wherein the first carrier transporting layer comprise 2 or more carrier transporting layers formed of different carrier transporting materials, and the light-reflecting layer is positioned between different carrier transporting layers. 
   
   
       5 . The organic electroluminescent device according to  claim 4  wherein a carrier transporting layer of the first carrier transporting layer positioned between the first electrode and the light-reflecting layer is a layer doped with a material having a function of producing carriers. 
   
   
       6 . The organic electroluminescent device according to any one of  claims 1  to  5  wherein the light-reflecting layer is positioned apart from the organic emitting layer by 10 nm or more. 
   
   
       7 . An organic electroluminescent device comprising a first electrode, a planarization layer positioned so as to cover the first electrode, a conductive light-reflecting layer, an organic material layer and a second electrode in this order;
 the second electrode being light-transmissible;   the organic material layer having a structure wherein a first carrier transporting layer, an organic emitting layer and a second carrier transporting layer are stacked in this order;   the first electrode layer being electrically connected to the light-reflecting layer; and   the part between the second electrode and the light-reflecting layer forming an optical resonator enhancing light emitted from the organic emitting layer.   
   
   
       8 . A display comprising the organic electroluminescent device of any one of  claims 1  to  7 .