| abstract |
PROBLEM TO BE SOLVED: To provide a light emitting element having excellent luminance life. An anode, a cathode, a first layer provided between the anode and the cathode and containing a compound represented by the formula (C-1), and provided between the first layer and the cathode. , At least one selected from a simple substance consisting only of alkali metal elements, a simple substance consisting only of Group 2 elements, a compound containing alkali metal elements, and a compound containing Group 2 elements (units or compounds of the second layer) A second layer containing, and a second layer and a cathode provided between the second layer and the cathode in contact with the cathode, a simple substance consisting of an alkali metal element only, a simple substance consisting of only a Group 2 element, a compound containing an alkali metal element, and A third layer containing at least one kind selected from compounds containing a Group 2 element (single body or compound of third layer), and at least one kind of single body or compound of second layer, At least one of a single substance or a compound of the third layer, Different, the light-emitting element. [Ring R 1C to Ring R 4C represent an aromatic hydrocarbon ring or the like, and R C represents a carbon atom or the like. ] [Selection diagram] None |