Organic light emitting device

An organic light emitting device comprising:

• an anode;
• a cathode;
• and at least one light emitting layer interposed between the anode and the cathode,
• wherein the light emitting layer comprises a first host compound represented by Chemical Formula 1 below, and a second host compound represented by Chemical Formula 2 below:
• in Chemical Formula 1,
• R1 is a substituted or unsubstituted C1-60 alkyl;
• a substituted or unsubstituted C3-60 cycloalkyl;
• a substituted or unsubstituted C6-60 aryl;
• or a substituted or unsubstituted C2-60 heteroaryl containing at least one of O, N, Si and S,
• R2 and R3 are each independently hydrogen;
• deuterium;
• halogen;
• cyano;
• a substituted or unsubstituted C1-60 alkyl;
• or a substituted or unsubstituted C3-60 cycloalkyl,
• n is an integer of 0 to 4,
• m is an integer of 0 to 3,
• Y is O, S, or CR4R5,
• R4 and R5 are each independently hydrogen;
• deuterium;
• halogen;
• cyano;
• a substituted or unsubstituted C1-60 alkyl;
• a substituted or unsubstituted C3-60 cycloalkyl;
• or a substituted or unsubstituted C6-60 aryl,
• Ar is represented by the following Chemical Formula 1′
• wherein,
• L is a single bond;
• a substituted or unsubstituted C6-60 arylene;
• or a substituted or unsubstituted C2-60 heteroarylene containing at least one of O, N, Si and S,
• X1 to X3 are each independently N, or CR6, provided that at least one of X1 to X3 is N,
• each R6 is independently hydrogen;
• deuterium;
• halogen;
• cyano;
• nitro;
• amino;
• a substituted or unsubstituted C1-60 alkyl;
• a substituted or unsubstituted C1-60 haloalkyl;
• a substituted or unsubstituted C1-60 haloalkoxy;
• a substituted or unsubstituted C3-60 cycloalkyl;
• a substituted or unsubstituted C2-60 alkenyl;
• a substituted or unsubstituted C6-60 aryl;
• or a substituted or unsubstituted C2-60 heteroaryl containing at least one of O, N, Si and S,
• 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 of O, N, Si and S,
• in Chemical Formula 2,
• R′1 is a substituted or unsubstituted C6-60 aryl,
• R′2 and R′3 are each independently hydrogen;
• deuterium;
• halogen;
• cyano;
• a substituted or unsubstituted C1-60 alkyl;
• a substituted or unsubstituted C3-60 cycloalkyl;
• a substituted or unsubstituted C6-60 aryl;
• or a substituted or unsubstituted C2-60 heteroaryl containing at least one of O, N, Si and S,
• n′ and m′ are each independently an integer of 0 to 4,
• L′ is a single bond;
• or a substituted or unsubstituted C6-60 arylene,
• Y′ is O, S, NR′, or CR′R″,
• R′ and R″ are each independently a substituted or unsubstituted C1-60 alkyl;
• a substituted or unsubstituted C3-60 cycloalkyl;
• a substituted or unsubstituted C6-60 aryl;
• or a substituted or unsubstituted C2-60 heteroaryl containing at least one of O, N, Si and S, or R′ and R″ together form a substituted or unsubstituted C6-60 aromatic ring.