Compound and organic light-emitting device comprising same

A compound of the following Chemical Formula 1:

• wherein, in Chemical Formula 1,
• Ar is an aryl group having 6 to 18 carbon atoms, which is unsubstituted or substituted with at least one selected from the group consisting of deuterium, a cyano group, an alkyl group, a cycloalkyl group, and an aryl group, or a substituted or unsubstituted heteroaryl group having 2 to 18 carbon atoms, comprising at least one of O and S,
• R1 to R3 are the same as or different from each other, and are each independently hydrogen, deuterium, or a substituted or unsubstituted aryl group,
• R4 to R6 are the same as or different from each other, and are each independently an aryl group having 6 to 12 carbon atoms, which is unsubstituted or substituted with deuterium, or an alkyl group that is unsubstituted or substituted with deuterium,
• r1 is an integer from 1 to 4, and when r1 is 2 or higher, two or more R1s are the same as or different from each other,
• r2 is 1 or 2, and when r2 is 2, the two R2s are the same as or different from each other,
• r3 is an integer from 1 to 4, and when r3 is 2 or higher, two or more R3s are the same as or different from each other, and
• a is an integer from 0 to 4, and means the number of deuterium atoms represented by D.