Organic electroluminescent compound, organic electroluminescent material and organic electroluminescent device comprising the same

An organic electroluminescent compound represented by the following formula 1:

• wherein
• Y represents S, O or NR5;
• R1 to R5, each independently, represent deuterium, a halogen, a 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, or a substituted or unsubstituted (C1-C30)alkyl(C6-C30)arylamino;
• or are linked to adjacent R1 to R5 to form a substituted or unsubstituted, mono- or polycyclic, (C3-C30) alicyclic or aromatic ring, or the combination thereof, whose carbon atom(s) may be replaced with at least one heteroatom selected from nitrogen, oxygen, and sulfur;
• the heteroaryl contains at least one heteroatom selected from B, N, O, S, Si, and P;
• a, b and d, each independently, represent an integer of 0 to 4, c represents an integer of 0 to 3;
• where if a to d, each independently, represent an integer of 2 or more, each of R1 to R4 may be the same or different;
• and
• with the proviso, when Y represents NR5 and a represents 2, two R1 are not fused with the aryl ring to which they are attached to form a carbazole ring.