Electroactive compounds

A compound having Formula I

• wherein:
• Ar1, Ar2, Ar4, and Ar6 are each independently hydrocarbon aryl, heteroaryl, or a substituted derivative thereof;
• Ar3, and Ar5 each independently have Formula a
• wherein in Formula a,
• R8 is the same or different at each occurrence and each independently D, F, CN, alkyl, aryloxy, heteroaryl, alkoxy, siloxy, silyl, germyl, deuterated alkyl, deuterated aryloxy, deuterated heteroaryl, deuterated alkoxy, deuterated siloxane, deuterated silyl, or deuterated germyl;
• p is the same or different at each occurrence and each independently an integer from 0-4;
• q is an integer from 0-5;
• wherein at least one of p or q is greater than 0;
• r is 2 or 3;
• and
• * indicates a point of attachment;
• a and b are each independently 0 or 1;
• m and n are 1;
• and
• Core is Formula IA
• where in Formula IA,
• Y is the same or different at each occurrence and each independently O, S, Se, Te, NR2, CR3R4, or SiR5R6;
• R2 is the same or different at each occurrence and each independently alkyl, hydrocarbon aryl, heteroaryl, or a substituted derivative thereof;
• R3-R6 are each independently alkyl, silyl, germyl, hydrocarbon aryl, heteroaryl, or a substituted derivative thereof, where R3 and R4 and/or R5 and R6 are optionally joined together to form a cyclic group selected from cycloalkyl, silacycloalkyl, spirofluorenyl, silaspirofluorenyl, or a substituted derivative thereof;
• a double dashed line between two rings indicates that the rings are fused together in any orientation;
• and
• * indicates a point of attachment;
• wherein the Core optionally has one or more substituents selected from the group consisting of D, alkyl, silyl, germyl, hydrocarbon aryl, heteroaryl, deuterated alkyl, deuterated silyl, deuterated germyl, deuterated hydrocarbon aryl, and deuterated heteroaryl.