A triazine compound according to formula 1: wherein G 1 has the formula 2: wherein G 1 of formula 2 is linked to formula 1 to one position, selected from the positions marked by " 1, 2, and 4"; X is O, S or Se; a, b, d, e are selected from 0 or 1, c = 1, and at least one of a, b, d and e is 1, wherein 2 ≤ a+b+c+d + e ≤ 5; n is selected from 0, 1 or 2, Ar 1 is selected from H, C 1 to C 16 alkyl, substituted or unsubstituted C 6 to C 40 aryl, substituted or unsubstituted C 3 to C 40 heteroaryl, wherein the substituents of the substituted C 6 to C 40 aryl and substituted C 3 to C 40 heteroaryl are selected from C 1 to C 16 alkyl, C 1 to C 16 alkoxy, C 3 to C 16 branched alkyl, C 3 to C 16 cyclic alkyl, C 3 to C 16 branched alkoxy, C 3 to C 16 cyclic alkoxy, partially or perfluorinated C 1 to C 16 alkyl, partially or perfluorinated C 1 to C 16 alkoxy, partially or perdeuterated C 1 to C 16 alkyl, partially or perdeuterated C 1 to C 16 alkoxy, C 6 to C 24 aryl, C 3 to C 25 heteroaryl, -PX(R 1) 2, D, F or CN, wherein R 1 is independently selected from C 1 to C 16 alkyl, C 1 to C 16 alkoxy, partially or perfluorinated C 1 to C 16 alkyl, partially or perfluorinated C 1 to C 16 alkoxy, partially or perdeuterated C 1 to C 16 alkyl, partially or perdeuterated C 1 to C 16 alkoxy, C 6 to C 18 aryl, C 3 to C 25 heteroaryl; Ar 2, Ar 3, Ar 5 and Ar 6 are independently selected from substituted or unsubstituted C 6 to C 12 aryl or substituted or unsubstituted C 4 to C 10 heteroaryl, wherein the substituent of the substituted C 6 to C 12 aryl or substituted C 4 to C 10 heteroaryl is selected from C 1 to C 6 alkyl, C 1 to C 6 alkoxy, partially or perdeuterated C 1 to C 6 alkyl, partially or perdeuterated C 1 to C 6 alkoxy, partially or perfluorinated C 1 to C 6 alkyl, partially or perfluorinated C 1 to C 6 alkoxy, D, F, or CN; and Ar 4 is independently selected from unsubstituted C 6 to C 12 aryl or unsubstituted C 4 to C 10 heteroaryl. G 1 has the formula 2: G 1 of formula 2 is linked to formula 1 to one position, selected from the positions marked by " 1, 2, and 4"; X is O, S or Se; a, b, d, e are selected from 0 or 1, c = 1, and at least one of a, b, d and e is 1, wherein 2 ≤ a+b+c+d + e ≤ 5; n is selected from 0, 1 or 2, Ar 1 is selected from H, C 1 to C 16 alkyl, substituted or unsubstituted C 6 to C 40 aryl, substituted or unsubstituted C 3 to C 40 heteroaryl, wherein the substituents of the substituted C 6 to C 40 aryl and substituted C 3 to C 40 heteroaryl are selected from C 1 to C 16 alkyl, C 1 to C 16 alkoxy, C 3 to C 16 branched alkyl, C 3 to C 16 cyclic alkyl, C 3 to C 16 branched alkoxy, C 3 to C 16 cyclic alkoxy, partially or perfluorinated C 1 to C 16 alkyl, partially or perfluorinated C 1 to C 16 alkoxy, partially or perdeuterated C 1 to C 16 alkyl, partially or perdeuterated C 1 to C 16 alkoxy, C 6 to C 24 aryl, C 3 to C 25 heteroaryl, -PX(R 1) 2, D, F or CN, wherein R 1 is independently selected from C 1 to C 16 alkyl, C 1 to C 16 alkoxy, partially or perfluorinated C 1 to C 16 alkyl, partially or perfluorinated C 1 to C 16 alkoxy, partially or perdeuterated C 1 to C 16 alkyl, partially or perdeuterated C 1 to C 16 alkoxy, C 6 to C 18 aryl, C 3 to C 25 heteroaryl; X is O, S or Se; a, b, d, e are selected from 0 or 1, c = 1, and at least one of a, b, d and e is 1, wherein 2 ≤ a+b+c+d + e ≤ 5; n is selected from 0, 1 or 2, Ar 1 is selected from H, C 1 to C 16 alkyl, substituted or unsubstituted C 6 to C 40 aryl, substituted or unsubstituted C 3 to C 40 heteroaryl, wherein the substituents of the substituted C 6 to C 40 aryl and substituted C 3 to C 40 heteroaryl are selected from C 1 to C 16 alkyl, C 1 to C 16 alkoxy, C 3 to C 16 branched alkyl, C 3 to C 16 cyclic alkyl, C 3 to C 16 branched alkoxy, C 3 to C 16 cyclic alkoxy, partially or perfluorinated C 1 to C 16 alkyl, partially or perfluorinated C 1 to C 16 alkoxy, partially or perdeuterated C 1 to C 16 alkyl, partially or perdeuterated C 1 to C 16 alkoxy, C 6 to C 24 aryl, C 3 to C 25 heteroaryl, -PX(R 1) 2, D, F or CN, wherein R 1 is independently selected from C 1 to C 16 alkyl, C 1 to C 16 alkoxy, partially or perfluorinated C 1 to C 16 alkyl, partially or perfluorinated C 1 to C 16 alkoxy, partially or perdeuterated C 1 to C 16 alkyl, partially or perdeuterated C 1 to C 16 alkoxy, C 6 to C 18 aryl, C 3 to C 25 heteroaryl; Ar 2, Ar 3, Ar 5 and Ar 6 are independently selected from substituted or unsubstituted C 6 to C 12 aryl or substituted or unsubstituted C 4 to C 10 heteroaryl, wherein the substituent of the substituted C 6 to C 12 aryl or substituted C 4 to C 10 heteroaryl is selected from C 1 to C 6 alkyl, C 1 to C 6 alkoxy, partially or perdeuterated C 1 to C 6 alkyl, partially or perdeuterated C 1 to C 6 alkoxy, partially or perfluorinated C 1 to C 6 alkyl, partially or perfluorinated C 1 to C 6 alkoxy, D, F, or CN; and Ar 4 is independently selected from unsubstituted C 6 to C 12 aryl or unsubstituted C 4 to C 10 heteroaryl.