Light emitting element and light emitting device having the light emitting element

A light emitting device comprising:

• a semiconductor layer;
• a pair of electrodes provided over the semiconductor layer;
• and
• a first layer, a second layer, and a third layer provided in this order between the pair of the electrodes,
• wherein any one of the first layer to the third layer has a layer containing both a metal oxide and a triazine derivative represented by the general formula (1),
• R1 to R12 are independent, or at least one of R1 and R2, R3 and R4, R5 and R6, R7 and R8, R9 and R10, R11 and R12 is bonded to form a ring selected from an aromatic ring, a heterocycle, and an alicycle which are unsubstituted or have an alkyl group having 1 to 6 carbon atoms;
• and
• when R1 to R12 are independent, R1 to R12 are individually any one of hydrogen, an alkyl group having 1 to 6 carbon atoms, an alkoxy group having 1 to 6 carbon atoms, a halogen group, an acyl group having 1 to 6 carbon atoms, an alkoxycarbonyl group having 1 to 6 carbon atoms, an aryl group having 6 to 30 carbon atoms, and a heteroaromatic group having 2 to 18 carbon atoms, and
• wherein:
• X1, X2, and X3 indicate individually any group of formulas (2) to (7)
• R13 and R14 are independent or bonded to each other to form an alicycle having 3 to 10 carbon atoms;
• when R13 and R14 are independent, R13 and R14 are selected from hydrogen, an alkyl group having 1 to 6 carbon atoms, an aryl group having 6 to 30 carbon atoms, and a heteroaromatic group having 2 to 18 carbon atoms;
• R15 is any one of hydrogen, an unsubstituted aryl group having 6 to 30 carbon atoms, and an aryl group having 6 to 30 carbon atoms which is substituted by a substitutent selected from an alkyl group having 1 to 6 carbon atom, an acyl group having 1 to 6 carbon atoms, a halogen group, and a heteroaromatic group having 2 to 18 carbon atoms;
• R16 and R17 are selected from hydrogen, an unsubstituted aryl group having 6 to 30 carbon atoms, and an aryl group having 6 to 30 carbon atoms which is substituted b a substituent selected from an alkyl group having 1 to 6 carbon atoms, a halogen group, an aryl group having 6 to 30 carbon atoms, a heteroaromatic group having 2 to 18 carbon atoms, and a cyano group;
• and
• R18 is any one of hydrogen, an alkyl group having 1 to 6 carbon atoms, an unsubstituted aryl group having 6 to 30 carbon atoms, an aryl group having 6 to 30 carbon atoms which is substituted by a dialhylamino group, and a heteroaromatic group having 2 to 18 carbon atoms.