Organic light-emitting device

An organic light emitting device comprising:

• a first electrode;
• a second electrode;
• and
• one or more organic material layers provided between the first electrode and the second electrode,
• wherein one or more of the one or more organic material layers include a compound of Chemical Formula 1 and a compound Chemical Formula 2:
• wherein in Chemical Formula 1,
• A, B and C are each independently a substituted or unsubstituted aromatic hydrocarbon ring;
• or a substituted or unsubstituted heteroring,
• X3 and X4 are each independently O;
• S;
• or NR,
• Y1 is boron or phosphine oxide,
• R is hydrogen;
• deuterium;
• a halogen group;
• a cyano group;
• a substituted or unsubstituted alkyl group;
• a substituted or unsubstituted silyl group;
• a substituted or unsubstituted alkoxy group;
• a substituted or unsubstituted aryl group;
• or a substituted or unsubstituted heterocyclic group, and
• two or more adjacent R, A, B and C groups bond to each other to form a ring,
• wherein in Chemical Formula 2,
• R1 to R3 are each independently hydrogen;
• deuterium;
• a halogen group;
• a cyano group;
• a substituted or unsubstituted alkyl group;
• a substituted or unsubstituted silyl group;
• a substituted or unsubstituted alkoxy group;
• a substituted or unsubstituted aryl group;
• or a substituted or unsubstituted heterocyclic group,
• a and b are each independently an integer of 0 to 7,
• c is an integer of 4 to 8,
• wherein when a and b are each an integer of 2 or greater, a plurality of R1s and R2s are each the same as or different from each other, and
• R3s are the same as or different from each other, and four or more R3s are deuterium.