Organic light emitting device

An organic light emitting device comprising:

• an anode;
• a cathode which is provided opposite to the anode;
• and
• a light emitting layer which is interposed between the anode and the cathode,
• wherein the light emitting layer includes a first compound represented by the following Chemical Formula 1, and a second compound represented by the following Chemical Formula 2:
• wherein in Chemical Formula 1:
• L1 to L3 are each independently a single bond or a substituted or unsubstituted C6-60 arylene;
• Ar1 and Ar2 are each independently a substituted or unsubstituted C6-60 aryl, or a substituted or unsubstituted C2-60 heteroaryl containing at least one heteroatom selected among N, O and S;
• R is hydrogen, deuterium, halogen, cyano, a substituted or unsubstituted C1-60 alkyl, a substituted or unsubstituted C6-60 aryl, or a substituted or unsubstituted C2-60 heteroaryl containing at least one heteroatom selected among N, O and S, with the proviso that at least one of R is a substituted or unsubstituted C6-60 aryl or a substituted or unsubstituted C2-60 heteroaryl containing at least one heteroatom selected among N, O and S;
• and
• k is an integer of 1 to 7;
• wherein in Chemical Formula 2:
• X1 and X2 are each independently O or S;
• A1 and A2 are each independently a naphthalene ring fused with an adjacent pentagonal ring;
• L′1 to L′3 are each independently a single bond or a substituted or unsubstituted C6-60 arylene;
• Ar′ is a substituted or unsubstituted C6-60 aryl, or a substituted or unsubstituted C2-60 heteroaryl containing at least one heteroatom selected among N, O and S;
• R′1 is hydrogen, deuterium, halogen, cyano, a substituted or unsubstituted C1-60 alkyl, or a substituted or unsubstituted C6-60 aryl;
• R′2 is hydrogen, deuterium, halogen, cyano, or a substituted or unsubstituted C1-60 alkyl;
• and
• a and b are each independently an integer of 0 to 9.