Organic Semiconductor Element

Abstract

By introducing new concepts into a structure of a conventional organic semiconductor element and without using a conventional ultra thin film, an organic semiconductor element is provided which is more reliable and has higher yield. Further, efficiency is improved particularly in a photoelectronic device using an organic semiconductor. Between an anode and a cathode, there is provided an organic structure including alternately laminated organic thin film layer (functional organic thin film layer) realizing various functions by making an SCLC flow, and a conductive thin film layer (ohmic conductive thin film layer) imbued with a dark conductivity by doping it with an acceptor and a donor, or by the like method.

What is claimed is: 
     
         1 . (canceled) 
     
     
         2 . A light-emitting device comprising:
 a first electrode;   a first functional layer over the first electrode, the first functional layer including a first light-emitting material;   a thin film layer over the first functional layer, the thin film layer is a stack of a metal layer and an organic compound layer which comprises an organic compound and an acceptor;   a second functional layer over the thin film layer, the second functional layer including a second light-emitting material; and   a second electrode over the second functional layer.   
     
     
         3 . The light-emitting device according to  claim 2 , wherein the metal layer is arranged to transmit visible light. 
     
     
         4 . The light-emitting device according to  claim 2 , wherein the metal layer comprises Al. 
     
     
         5 . The light-emitting device according to  claim 2 , wherein the organic compound is a hole-transporting material. 
     
     
         6 . The light-emitting device according to  claim 2 , wherein the stack further comprises a second organic compound film which comprises an electron-transporting material and a donor. 
     
     
         7 . The light-emitting device according to  claim 2 , wherein the acceptor is a Lewis acid. 
     
     
         8 . The light-emitting device according to  claim 6 , wherein the donor is selected from an alkali metal and an alkali earth metal. 
     
     
         9 . The light-emitting device according to  claim 2 , wherein at least one of the first light-emitting material and the second light-emitting material is a phosphorescent material. 
     
     
         10 . The light-emitting device according to  claim 2 , wherein the light-emitting device is configured to emit white light. 
     
     
         11 . A light-emitting device comprising:
 a first electrode;   a first functional layer over the first electrode, the first functional layer including a first light-emitting material;   a thin film layer over the first functional layer, the thin film layer is a stack of a metal layer and an organic compound layer which comprises an organic compound and a donor;   a second functional layer over the thin film layer, the second functional layer including a second light-emitting material; and   a second electrode over the second functional layer.   
     
     
         12 . The light-emitting device according to  claim 11 , wherein the metal layer is arranged to transmit visible light. 
     
     
         13 . The light-emitting device according to  claim 11 , wherein the metal layer comprises Al. 
     
     
         14 . The light-emitting device according to  claim 11 , wherein the donor is selected from an alkali metal and an alkali earth metal. 
     
     
         15 . The light-emitting device according to  claim 11 , wherein the organic compound is an electron-transporting material. 
     
     
         16 . The light-emitting device according to  claim 11 , wherein at least one of the first light-emitting material and the second light-emitting material is a phosphorescent material. 
     
     
         17 . The light-emitting device according to  claim 11 , wherein the light-emitting device is configured to emit white light. 
     
     
         18 . A light-emitting device comprising:
 a first electrode;   a first functional layer over the first electrode, the first functional layer including a first light-emitting material;   a metal layer over the first functional layer, the metal layer having an island shape;   a second functional layer over the metal layer, the second functional layer including a second light-emitting material; and   a second electrode over the second functional layer.   
     
     
         19 . The light-emitting device according to  claim 18 , wherein the metal layer comprises Al. 
     
     
         20 . The light-emitting device according to  claim 18 , further comprising an organic compound layer on a side of the metal layer, wherein the organic compound layer comprises a hole-transporting material and an acceptor. 
     
     
         21 . The light-emitting device according to  claim 20 , wherein the acceptor is a Lewis acid. 
     
     
         22 . The light-emitting device according to  claim 18 , further comprising an organic compound layer on a side of the metal layer, wherein the organic compound layer comprises an electron-transporting material and a donor. 
     
     
         23 . The light-emitting device according to  claim 22 , wherein the donor is selected from an alkali metal and an alkali earth metal. 
     
     
         24 . The light-emitting device according to  claim 18 , wherein at least one of the first light-emitting material and the second light-emitting material is a phosphorescent material. 
     
     
         25 . The light-emitting device according to  claim 18 , wherein the light-emitting device is configured to emit white light.