Organic light emitting device

An organic light emitting device comprising:

• an anode;
• a cathode;
• and
• a light emitting layer between the anode and the cathode,
• wherein the light emitting layer comprises a compound represented by the following Chemical Formula 1, and a compound represented by the following Chemical Formula 2 or 3:
• wherein in Chemical Formula 1,
• L is a single bond;
• or a substituted or unsubstituted C6-60 arylene,
• each X is N or CH, with the proviso that two or more X's are N,
• R is hydrogen, deuterium, a substituted or unsubstituted C6-60 aryl, or a substituted or unsubstituted C2-60 heteroaryl containing one or more selected from the group consisting of N, O and S,
• Ar1 and Ar2 are each independently a substituted or unsubstituted C6-60 aryl or a substituted or unsubstituted C2-60 heteroaryl containing one or more selected from the group consisting of N, O and S,
• wherein in Chemical Formulas 2 and 3,
• R′ is the following Chemical Formula 4 or a substituted or unsubstituted C6-60 aryl,
• when R′ is the following Chemical Formula 4, R′1 to R′6 are each independently hydrogen or deuterium,
• when R′ is not the following Chemical Formula 4, one of R′1 to R′6 is the following Chemical Formula 4, and the rest are each independently hydrogen or deuterium,
• wherein in Chemical Formula 4,
• L′ is a single bond, a substituted or unsubstituted C6-60 arylene, or a substituted or unsubstituted C2-60 heteroarylene containing one or more selected from the group consisting of N, O and S,
• L′1 and L′2 are each independently a single bond, a substituted or unsubstituted C6-60 arylene, or a substituted or unsubstituted C2-60 heteroarylene containing one or more selected from the group consisting of N, O and S, and
• Ar′1 and Ar′2 are each independently a substituted or unsubstituted C6-60 aryl or a substituted or unsubstituted C2-60 heteroaryl containing one or more selected from the group consisting of N, O and S.