Composition and light emitting device using the same

A composition comprising

• an organic EL material, wherein the organic EL material contains an iridium complex and a host material,
• a solvent (A) represented by the formula (1),
• an aromatic hydrocarbon solvent (B), wherein the aromatic hydrocarbon solvent (B) is a benzene derivative having a total number of carbon atoms of 7 to 15 and substituted with an alkyl group or a cycloalkyl group, and
• an aromatic ether solvent (C) wherein the aromatic ether solvent (C) is at least one selected from the group consisting of:
• alkylaryl ethers having a total number of carbon atoms of 7 to 15 and in which the aryl portion is optionally substituted with an alkyl group;
• and diaryl ethers having a total number of carbon atoms of 12 to 15 and optionally substituted with an alkyl group:
• wherein R1 represents an alkyl group having a number of carbon atoms of 10 to 12;
• and
• wherein the content of the solvent (A):
• wtA (by weight), the content of the aromatic hydrocarbon solvent (B):
• wtB (by weight) and the content of the aromatic ether solvent (C):
• wtC (by weight) satisfy the formula (1-1):
• 0.05≤wtA/(wtA+wtB+wtC)≤0.50 (1-1).