Organic electroluminescent compound and organic electroluminescent device comprising the same

An organic electroluminescent compound represented by any one of the following formulae 2, 3, and 5:

• Wherein,
• Y and Y1 each independently represent —N-L1-Ar1, —O—, —S—, or —CR1R2;
• L1 represents a single bond, a substituted or unsubstituted (C1-C30)alkylene, a substituted or unsubstituted (C6-C30)arylene, a substituted or unsubstituted (3-to 30-membered) heteroarylene, or a substituted or unsubstituted (C3-C30)cycloalkylene;
• Ar1 represents a substituted or unsubstituted (C6-C30)aryl, a substituted or unsubstituted (3-to 30-membered) heteroaryl, or —NR3R4;
• R1 to R4 each independently represent hydrogen, deuterium, halogen, cyano, a substituted or unsubstituted (C1-C30)alkyl, a substituted or unsubstituted (C6-C30)aryl, a substituted or unsubstituted (3-to 30-membered) heteroaryl, or a substituted or unsubstituted (C3-C30)cycloalkyl;
• or may be linked to an adjacent substituent to form a substituted or unsubstituted ring;
• Z1 to Z12 each independently represent N or CRa;
• and
• Ra each independently represent hydrogen, deuterium, halogen, cyano, a substituted or unsubstituted (C1-C30)alkyl, a substituted or unsubstituted (C6-C30)aryl, a substituted or unsubstituted (3-to 30-membered) heteroaryl, a substituted or unsubstituted (C3-C30)cycloalkyl, a substituted or unsubstituted (C1-C30)alkoxy, a substituted or unsubstituted tri(C1-C30)alkylsilyl, a substituted or unsubstituted di(C1-C30)alkyl(C6-C30)arylsilyl, a substituted or unsubstituted (C1-C30)alkyldi(C6-C30)arylsilyl, a substituted or unsubstituted tri(C6-C30)arylsilyl, a substituted or unsubstituted mono- or di-(C1-C30)alkylamino, a substituted or unsubstituted mono- or di-(C6-C30)arylamino, a substituted or unsubstituted (C1-C30)alkyl(C6-30)arylamino, a substituted or unsubstituted mono- or di-(3-to 30-membered)heteroarylamino, or a substituted or unsubstituted (C6-C30)aryl (3-to 30-membered)heteroarylamino.