Electroluminescent compound and electroluminescent device including the same

An electroluminescent compound of Formula 1 or Formula 2:

• wherein each of X1 to X4 is independently N or CR′,
• wherein each of R and R′ is independently selected from the group consisting of hydrogen, deuterium, cyano group, hydroxyl group, halogen, substituted or non-substituted C1 to C10 alkyl group, substituted or non-substituted C6 to C20 aryl group and substituted or non-substituted C3 to C30 heteroaryl group,
• wherein each of L1 and L2 is independently selected from a single bond, substituted or non-substituted C6 to C20 arylene group and substituted or non-substituted C3 to C30 heteroarylene group,
• wherein Ar is selected from the group consisting of a substituted or non-substituted C6 to C20 arylene group and substituted or non-substituted C3 to C30 heteroarylene group, and
• wherein each of Ar1 and Ar2 is independently selected from the group consisting of substituted or non-substituted C6 to C20 aryl group and substituted or non-substituted C3 to C30 heteroaryl group.