| 摘要 |
PROBLEM TO BE SOLVED: To provide a light-emitting material containing a compound having a pyridazine ring structure and a phosphorescent compound, and excelling in luminous efficiency. SOLUTION: The composition contains a compound having a pyridazine ring structure and a phosphorescent compound. The compound having a pyridazine ring structure has at least one pyridazine ring structure selected from a group comprising pyridazine ring structures represented by formula 1-1, formula 1-2, formula 2-1, formula 2-2, formula 2-3 and formula 2-4, wherein R and R<SP>1</SP>are each independently a hydrogen atom or a univalent substitutional group; and, when a plurality of R's and R<SP>1</SP>'s are present, they may be the same or different from one another. COPYRIGHT: (C)2010,JPO&INPIT
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