To obtain the subject material having high color purity, capable of emitting a light with high brightness and high efficiency from green to red by a low-voltage drive, having excellent stability in repeated use, capable of emitting a light in a uniform planar state, useful as a luminous agent, a hole injection agent and a hole transportation agent by making the material include a specific amine compound.
This light emission element comprises a compound of formula I (R1 to R3 are each a substitutable aryl, heterocyclic or the like and two or more of R1 to R3 are a substitutable aryl or the like and one or more of R1 to R3 are each a group of formula II; R4 is a heterocyclic or the like; R5 is an electron attractive group or the like; R6 to R8 are each H or the like; m is 0-2; with the proviso that when only one group of formula II is contained in the formula I, R4 and R5 are not cyano at the same time, when R5 is H, R4 is a heterocyclic, contains an aromatic ring and includes a tricyclic to heptacyclic) (e.g. a compound of formula III, etc.). The compound of formula I is obtained, for example, by formylating the aryl group of a triarylamine and reacting the formylated amine with an active methylene compound in the presence (absence) of a base.
