| 摘要 |
A compound represented by formula (I) [wherein R1 represents an alkyl group having a fluorine atom, or an aryl group having a fluorine atom on the ring thereof; and the ring A represents a monocyclic aromatic ring containing 1 to 3 ring-constituting nitrogen atoms or a polycyclic aromatic ring containing the aforementioned aromatic ring as a partial structure thereof], which has high luminous efficiency in a solution state as well as a solid state and is chemically stable. |
