Organic electric field light emitting element and production therefor

Abstract

A composition for an organic electroluminescent device is a composition for forming an organic light emitting layer of an organic electroluminescent device by wet coating process. The composition contains a phosphorescent material, a charge transport material, and a solvent, in which the phosphorescent material and the charge transport material are each an unpolymerized organic compound, and the first oxidation potential of the phosphorescent material E D + , the first reduction potential of the phosphorescent material E D − , the first oxidation potential of the charge transporting material E T + , and the first reduction potential of the charge transporting material E T − satisfy the following condition: E T − +0.1 ≦E D − <E T + ≦E D + −0.1 or E D − +0.1 ≦E T − <E D + ≦E T + −0.1.

1 . A composition for an organic electroluminescent device, comprising a phosphorescent material, a charge transport material, and a solvent,
 wherein each of the phosphorescent material and the charge transport material is independently an unpolymerized organic compound, and   wherein the first oxidation potential of the phosphorescent material ED + ,   the first reduction potential of the phosphorescent material ED − ,   the first oxidation potential of the charge transport material ET + , and   the first reduction potential of the charge transport material ET −  satisfy the following condition:
     E   T   − +0.1 ≦E   D   −   <E   T   +   ≦E   D   + −0.1  (1)
 
   or 
     E   D   − +0.1 ≦E   T   −   <E   D   +   ≦E   T   + −0.1  (2).
 
   
     
     
         2 . The composition for an organic electroluminescent device according to  claim 1 , wherein said condition E D   − +0.1≦E T   − <E D   + ≦E T   + −0.1 is satisfied, and an absolute value of the difference between E D   +  and E T   + |E D   + −E T   + | is 0.1 V or more. 
     
     
         3 . The composition for an organic electroluminescent device according to  claim 1 , wherein said condition E D   − +0.1≦E T   − <E D   + ≦E T   + −0.1 is satisfied, an absolute value of the difference between E D   +  and E T   −  |E D   + −E T   − | is 1.0 V or more. 
     
     
         4 . The composition for an organic electroluminescent device according to  claim 1 , wherein said condition E D   − +0.1≦E T   − <E D   + ≦E T   + −0.1 is satisfied, an absolute value of the difference between E D   −  and E T   −  |E D   − −E T   − | is 0.10 V or more. 
     
     
         5 . The composition for an organic electroluminescent device according to  claim 1 , wherein said condition E D   − +0.1≦E T   − <E D   + ≦E T   + −0.1 is satisfied, an absolute value of the difference between E T   +  and E D   −  |E T   + −E D   − | is 1.5 V or more. 
     
     
         6 . The composition for an organic electroluminescent device according to  claim 1 , wherein the condition E T   − +0.1≦E D   − <E T   + ≦E D   + −0.1 is satisfied, and an absolute value of the difference between E D   −  and E T   −  |E D   − −E T   − | is 0.1 V or more. 
     
     
         7 . The composition for an organic electroluminescent device according to  claim 1 , wherein the condition E T   − +0.1≦E D   − <E T   + ≦E D   + −0.1 is satisfied, and an absolute value of the difference between E T   +  and E D   −  |E T   + −E D   − | is 1.0 V or more. 
     
     
         8 . The composition for an organic electroluminescent device according to  claim 1 , wherein the condition E T   − +0.1≦E D   − <E T   + ≦E D   + −0.1 is satisfied, and an absolute value of the difference between E D   +  and E T   +  |E D   + −E T   + | is 0.1 V or more. 
     
     
         9 . The composition for an organic electroluminescent device according to  claim 1 , wherein the condition E T   − +0.1≦E D   − <E T   + ≦E D   + −0.1 is satisfied, and an absolute value of the difference between E T   −  and E D   +  |E T   − −E D   + | is 1.5 V or more. 
     
     
         10 . A thin film for an organic electroluminescent device formed from the composition for an organic electroluminescent device of  claim 1  by a wet coating process. 
     
     
         11 . The thin film for an organic electroluminescent device according to  claim 10 , wherein the thin film has a refractive index of 1.78 or less with respect to light having a wavelength of 500 nm to 600 nm. 
     
     
         12 . A transfer member for a thin film for an organic electroluminescent device, comprising a base material and a thin film arranged on the base material, wherein the thin film is formed from the composition for an organic electroluminescent device of  claim 1  by a wet coating process. 
     
     
         13 . An organic electroluminescent device comprising a substrate bearing an anode, a cathode, and an organic light emitting layer arranged between the two electrodes, wherein the organic light emitting layer is a layer formed by using the transfer member for a thin film for an organic electroluminescent device of  claim 12 . 
     
     
         14 . An organic electroluminescent device comprising a substrate bearing an anode, a cathode, and an organic light emitting layer arranged between the anode and cathode, wherein the organic light emitting layer is a layer formed from the composition for an organic electroluminescent device of  claim 1  by a wet coating process. 
     
     
         15 . The organic electroluminescent device according to  claim 13 , further comprising a hole injection layer between the organic light emitting layer and the anode. 
     
     
         16 . The organic electroluminescent device according to  claim 14 , further comprising a hole injection layer between the organic light emitting layer and the anode. 
     
     
         17 . The organic electroluminescent device according to  claim 13 , further comprising an electron injection layer between the organic light emitting layer and the cathode. 
     
     
         18 . The organic electroluminescent device according to  claim 14 , further comprising an electron injection layer between the organic light emitting layer and the cathode.