Novel compound and organic light emitting device comprising the same

A compound of Chemical Formula 1:

• wherein in the Chemical Formula 1:
• each X is independently N or CH, provided that at least one of X is N
• Y is O or S;
• at least one of Ar is phenyl, biphenylyl, or phenyl substituted with five deuteriums, and the rest of Ar are any one of phenyl, biphenylyl, dibenzofuranyl, or dibenzothiophenyl;
• R1, R2, and R3are each independently hydrogen, or deuterium;
• each R4 is independently hydrogen, or deuterium;
• or two adjacent R4s combine with each other to form a 1,1′-dimethyl-indene, benzofuran, benzothiophene, 1-phenyl-indole, deuterium-substituted 1,1′-dimethyl-indene, deuterium-substituted benzofuran, deuterium-substituted benzothiophene, or deuterium-substituted 1-phenyl-indole ring, and the rest of R4 are hydrogen or deuterium;
• n1, n2, and n3 are each independently 0 or 1;
• and
• n4 is an integer of 1 to 4,
• provided that at least one of Ar is phenyl substituted with five deuteriums, or
• at least one of R1, R2, R3, or R4 is substituted with one or more deuterium, or at least one of R1, R2, R3, and R4 is deuterium;
• and
• wherein the compound of Chemical Formula 1 is substituted with at least four deuteriums.