Composition of matter for use in organic light-emitting diodes

A compound of Formula (I):

• wherein:
• X is C(R)2, O, S or —N(Ph),
• R is independently selected from H, CH3, and Ph;
• Ph is substituted or unsubstituted phenyl,
• one of A1 and A2 is AA,
• AA is selected from CN, substituted or unsubstituted aryl having at least one cyano, and substituted or unsubstituted heteroaryl having at least one nitrogen atom as a ring-constituting atom,
• the other of A1 and A2 is H, AA, substituted or unsubstituted alkyl, or substituted or unsubstituted aryl not having cyano,
• one of D1, D2, D3 and D4 is DD,
• DD is represented by Formula (II):
• R1, R2, R3, R4, R5, R6, R7 and R8 are independently selected from hydrogen, deuterium, substituted or unsubstituted alkyl, substituted or unsubstituted alkoxy, substituted or unsubstituted amino, substituted or unsubstituted aryl, substituted or unsubstituted aryloxy, substituted or unsubstituted heteroaryl, substituted or unsubstituted heteroaryloxy, and silyl;
• or two or more instances of R1, R2, R3, R4, R5, R6, R7 and R8 taken together can form a ring system, or R5 and R6 taken together can form single bond,
• L1 is selected from single bond, substituted or unsubstituted arylene, and substituted or unsubstituted heteroarylene;
• the others of D1, D2, D3 and D4 are selected from H, DD, substituted or unsubstituted alkyl, substituted or unsubstituted aryl other than Formula (II),
• provided that when AA is substituted or unsubstituted heteroaryl having at least one nitrogen atom as a ring-constituting atom, X is O, D3 is DD, L1 is single bond, R7 and R8 are taken together to form a substituted or unsubstituted aryl, then R5 and R6 taken together can form single bond.