| abstract |
An object of the present invention is to provide a composition for an organic electroluminescence device which can suppress precipitation of a solute in the composition and is excellent in storage stability. Another object of the present invention is to provide an organic electroluminescent device that can form a uniform layer by using the composition, has a long life, has a low driving voltage, and has high luminous efficiency. The present invention relates to a composition for an organic electroluminescent device and its use, the composition comprising a compound group α composed of at least two compounds having a structure connected by multiple aromatic ring groups and having a molecular weight of 3000 or less and Solvent, the compound group α is composed of compound α1 with the least number of aromatic ring groups and other compounds αn satisfying specific conditions. In the case of using the structure with the largest number of aromatic ring groups in the common partial structure of compound α1 and compound αn as the basic skeleton, The structure of the compound α1 is 60% or more identical to the basic skeleton, and the compounds constituting the compound group α are mixed in an amount of 1% by weight or more. |