Organic light-emitting device and flat panel display including the same

An organic light-emitting device comprising:

• a first electrode;
• a second electrode;
• and
• an organic layer interposed between the first electrode and the second electrode,
• wherein the organic layer comprises a compound represented by Formula 1 and a compound represented by Formula 2 below:
• wherein, in Formula 1, Ar1 is a substituted or unsubstituted C3-C60 heteroaryl group;
• R1 to R4, R11, to R18, and R21 to R28 are each independently hydrogen, deuterium, a halogen atom, a cyano group, a substituted or unsubstituted C1-C60 alkyl group, a substituted or unsubstituted C2-C60 alkenyl group, a substituted or unsubstituted C3-C60 cycloalkyl group, a substituted or unsubstituted C3-C60 cycloalkenyl group, a substituted or unsubstituted C6-C60 aryl group, a substituted or unsubstituted C1-C60 trialkylsilyl group, a substituted or unsubstituted C1-C60 dialkylarylsilyl group, a substituted or unsubstituted C1-C60 triarylsilyl group, or a substituted or unsubstituted C3-C60 heteroaryl group;
• l and m are each independently an integer from 0 to 2;
• and
• n, o, p, and q are each independently an integer from 0 to 4, and
• wherein, in Formula 2, R51 and R52 are each independently hydrogen, deuterium, a substituted or unsubstituted C1-C60 alkyl group, or a substituted or unsubstituted C6-C12 aryl group;
• R53 to R56 are each independently hydrogen, deuterium, a halogen atom, a cyano group, a nitro group, a hydroxyl group, a substituted or unsubstituted C1-C60 alkyl group, a substituted or unsubstituted C2-C60 alkenyl group, a substituted or unsubstituted C3-C60 cycloalkyl group, a substituted or unsubstituted C3-C60 cycloalkenyl group, a substituted or unsubstituted C1-C60 trialkylsilyl group, a substituted or unsubstituted C1-C60 dialkylarylsilyl group, a substituted or unsubstituted C1-C60 triarylsilyl group, a substituted or unsubstituted C6-C60 aryl group, or a substituted or unsubstituted C3-C60 heteroaryl group;
• and
• r, s, t, and u are each independently an integer from 0 to 5.