Light-emitting material comprising orthometalated iridium complex, light-emitting device, high efficiency red light-emitting device, and novel iridium complex

1. A synthesis method of a compound represented by the following formula (23), the method comprising:

reacting at least one of a ligand and a dissociation product thereof with an iridium compound, which is iridium chloride (III), trisacetyl accetonate iridium (III), potassium hexachloroiridate (III), or potassium hexachloroiridate (IV), at a room temperature or at an elevated temperatures in the presence or absence of a solvent or in the presence or absence of a base:

wherein R 11 and R 12 each represents an alkyl group, an aryl group, a heteroaryl group, an alkoxy group, a halogen atom, a cyano group, or a cyclic structure obtained by the connection of one of the plurality of R 11 s to another of the plurality of R 11 s, or one of the plurality of R 12 s to another of the plurality of R 12 s, or one of the plurality of R 11 s to one of the plurality of R 12 s; R 13 , R 14 and R 15 each represents an alkyl group, an aryl group, or a heteroaryl group; m 1 represents an integer of from 0 to 4; and m 2 represents an integer of from 0 to 6.

2. The synthesis method according to claim 1 , which uses a mixed solvent of 2-methoxyethanol and water as the solvent.

3. The synthesis method according to claim 1 , wherein the reaction is conducted in a stream of nitrogen.

4. The synthesis method according to claim 1 , further comprising:

processing with an aqueous solution of hydrochloric acid.

5. The synthesis method according to claim 1 , further comprising:

purifying through a silica gel column chromatography.

6. The synthesis method according to claim 1 , which uses sodium methoxide as the base.