Organic light emitting device

An organic light emitting device comprising:

• an anode,
• a cathode,
• a light emitting layer between the anode and the cathode,
• an electron inhibition layer between the anode and the light emitting layer, and
• a hole transport layer between the electron inhibition layer and the anode,
• wherein the light emitting layer comprises a compound of the following Chemical Formula 1, a compound of the following Chemical Formula 2, and a compound of the following Chemical Formula 3:
• wherein in Chemical Formula 1:
• Y1 is O or S;
• each X1 is independently CH, or N, provided that at least one of X1 is N;
• L1 is a direct bond, a substituted or unsubstituted C6-60 arylene, or a substituted or unsubstituted C2-60 heteroarylene containing any one or more selected from the group consisting of N, O and S;
• Ar1 and Ar2 are each independently phenyl, biphenylyl, dibenzofuranyl, carbazol-9-yl, or (phenyl) carbazol-9-yl, wherein the Ar1 and Ar2 are each independently unsubstituted or substituted with at least one deuterium;
• R1 is hydrogen, deuterium, a substituted or unsubstituted C6-60 alkyl, a substituted or unsubstituted C6-60 aryl, or a substituted or unsubstituted C2-60 heteroaryl containing any one or more selected from the group consisting of N, O and S;
• and
• a is an integer of 1 to 7;
• wherein in Chemical Formula 2:
• Ar3 and Ar4 are each independently a substituted or unsubstituted C6-60 aryl or a substituted or unsubstituted C2-60 heteroaryl containing any one or more selected from the group consisting of N, O and S;
• R2 and R3 are each independently hydrogen, deuterium, a substituted or unsubstituted C6-60 aryl, or a substituted or unsubstituted C2-60 heteroaryl containing any one or more selected from the group consisting of N, O and S;
• and
• b and c are each independently an integer of 1 to 7;
• wherein in Chemical Formula 3;
• B is a benzene ring fused with two adjacent pentagonal rings;
• each X2 is independently CH or N, provided that at least one of X2 is N;
• L2 is a direct bond or phenylene, provided that when L2 is phenylene, it is unsubstituted or substituted with at least one deuterium
• Ar5 and Ar6 are each independently a substituted or unsubstituted C6-60 aryl or a substituted or unsubstituted C2-60 heteroaryl containing any one or more selected from the group consisting of N, O and S;
• and
• C is the following Chemical Formula 4-1 or 4-2;
• wherein in Chemical Formulas 4-1 and 4-2:
• the dotted line is a bond that is fused with B;
• Y2 is CRR′, C(CH3)2, O, S, or NAr7,
• wherein R and R′ are each independently a substituted or unsubstituted C6-60 alkyl, or a substituted or unsubstituted C6-60 aryl, and
• Ar7 is a substituted or unsubstituted C6-60 aryl, or a substituted or unsubstituted C2-60 heteroaryl containing any one or more selected from the group consisting of N, O and S;
• R4 is hydrogen, deuterium, a substituted or unsubstituted C6-60 aryl, or a substituted or unsubstituted C2-60 heteroaryl containing any one or more selected from the group consisting of N, O and S;
• and
• d is an integer of 1 to 10.