Triazine compounds substituted with bulky groups

A triazine compound according to formula 1:

• wherein
• X is O, S or Se;
• a, b, c, d are selected from 0 or 1, wherein 1≤a+b+c+d≤3;
• n is selected from 0, 1 or 2,
• Ar1 is selected from C1 to C16 alkyl, substituted or unsubstituted C6 to C40 aryl, substituted or unsubstituted C3 to C40 heteroaryl, wherein
• the substituents of the substituted C6 to C40 aryl and substituted C3 to C40 heteroaryl are selected from C1 to C16 alkyl, C1 to C16 alkoxy, C3 to C16 branched alkyl, C3 to C16 cyclic alkyl, C3 to C16 branched alkoxy, C3 to C16 cyclic alkoxy, partially or perfluorinated C1 to C16 alkyl, partially or perfluorinated C1 to C16 alkoxy, partially or perdeuterated C1 to C16 alkyl, partially or perdeuterated C1 to C16 alkoxy, C6 to C24 aryl, C3 to C25 heteroaryl, -PX(R1)2, D, F or CN, wherein
• R1 is independently selected from C1 to C16 alkyl, C1 to C16 alkoxy, partially or perfluorinated C1 to C16 alkyl, partially or perfluorinated C1 to C16 alkoxy, partially or perdeuterated C1 to C16 alkyl, partially or perdeuterated C1 to C16 alkoxy, C6 to C18 aryl, C3 to C25 heteroaryl;
• Ar2, Ar3, Ar4, Ar5 and Ar6 are independently selected from substituted or unsubstituted C6 to C12 aryl or substituted or unsubstituted C4 to C10 heteroaryl, wherein
• the substituent of the substituted C6 to C12 aryl or substituted C4 to C10 heteroaryl is selected from C1 to C6 alkyl, C1 to C6 alkoxy, partially or perdeuterated C1 to C6 alkyl, partially or perdeuterated C1 to C6 alkoxy, partially or perfluorinated C1 to C6 alkyl, partially or perfluorinated C1 to C6 alkoxy, D, F, or CN.