Composition for organic electroluminescent element, organic electroluminescent element, display and lighting

Abstract

The invention relates to a composition for organic electroluminescent element, which comprises: a solvent; and a compound group α for organic electroluminescent element that is constituted of at least two kinds of compounds which each have a molecular weight of 3,000 or less and have a structure comprising a plurality of aromatic ring groups linked to each other, wherein the compound group α comprises: a compound α1; and another compound an satisfying a specific condition.

1 : A composition comprising a compound group α for organic electroluminescent element and a solvent, wherein:
 the compound group α is constituted of at least two kinds of compounds which each have a molecular weight of 3,000 or less and have a structure comprising a plurality of aromatic ring groups linked to each other; 
 the compound group α comprises a first compound α1, which is the smallest in the number of aromatic ring groups, and another compound an (n is any integer of 2 or larger); 
 when a structure which is the largest in the number of the aromatic ring groups, of partial structures that are common between the compound α1 and the compound an, is taken as a basic framework, 60% or more of the structure of the compound α1 is identical with the basic framework, 
 the compounds which constitute the compound group α each is mixed in an amount of 1% by weight or large, and 
 each of the compounds included in the compound group α is a compound represented by formula (B): 
 
       
         
           
           
               
               
           
         
         wherein: 
         Xb 1  and Yb 1  each independently represent an aromatic hydrocarbon ring group which has 6-30 carbon atoms and may have a substituent or a heteroaromatic ring group which has 3-30 carbon atoms and may have a substituent; and 
         Xb 2 , Xb 3 , Yb 2 , and Yb 3  each independently represent a hydrogen atom, an aromatic hydrocarbon ring grout which has 6-30 carbon atoms and may have a substituent, or a heteroaromatic ring group which has 3-30 carbon atoms and may have a substituent. 
       
     
     
         2 : The composition of  claim 1 , wherein the proportion of the compound group α to all solid components of the composition is 0.1-100% by weight. 
     
     
         3 : The composition of  claim 1 , wherein the proportion of the solvent in the composition is 10% by weight or higher. 
     
     
         4 : The composition of  claim 1 , wherein the compounds included in the compound group α each are a charge transport material. 
     
     
         5 - 13 . (canceled) 
     
     
         14 : An organic electroluminescent element comprising:
 an anode;   a cathode; and   at least one organic layer interposed between the anode and the cathode,   wherein at least one of the organic layer(s) is a layer formed using the composition of  claim 1 .   
     
     
         15 : The organic electroluminescent element of  claim 14 , wherein the layer formed using the composition is an emissive layer. 
     
     
         16 : A display, comprising
 the organic electroluminescent element of  claim 14 .   
     
     
         17 : A lighting, comprising:
 the organic electroluminescent element of  claim 14 .