| abstract |
By using a light emitting element material having a pyrromethene skeleton represented by the general formula (1) and having a compound having a molecular weight of 450 or more, a green light emitting element having high luminous efficiency, long life and high color purity is provided. [R < 1> -R < 4> is an alkyl group, a cycloalkyl group, an alkoxy group, or an aryl ether group here, and may be same or different, respectively. R < 5> and R < 6> is halogen, hydrogen, or an alkyl group, and may be same or different, respectively. R < 7> is either an aryl group, heteroaryl group, or alkenyl group, and molecular weight is 200 or more. M is at least one member selected from the group consisting of boron, beryllium, magnesium, aluminum, chromium, iron, cobalt, nickel, copper, zinc and platinum. n is an integer of 0-4. m is an integer of 1-3. L is a monovalent or zero-valent group selected from halogen, hydrogen, alkyl group, aryl group or heteroaryl group, and is bonded to M through one or two atoms in the molecule. When n is 2-4, each L may mutually be same or different. When m is 2 or 3, R 1 to R 7 of each pyrromethene skeleton may be the same as or different from each other.] |