Organic light-emitting diode

An organic light-emitting diode, comprising:

• a substrate;
• a first electrode;
• a second electrode facing the first electrode;
• and
• an organic layer between the first electrode and the second electrode and including an emission layer, the emission layer including a first compound represented by Formula 1 and a second compound represented by Formula 100:
• wherein, in Formula 1,
• ring A is a 6-membered ring having at least one nitrogen atom (N), a 6-membered ring fused with at least one 5-membered ring and having at least one N, or a 6-membered ring fused with at least one 6-membered ring and having at least one N;
• X1 is N or C(R3);
• R1 to R4 are each independently selected from a hydrogen atom, a deuterium atom, a halogen atom, a hydroxyl group, a cyano group, a nitro group, an amino group, an amidino group, a hydrazine, a hydrazone, a carboxyl group or a salt thereof, a sulfonic acid group or a salt thereof, a phosphoric acid group or a salt thereof, a substituted or unsubstituted C1-C60 alkyl group, a substituted or unsubstituted C2-C60 alkenyl group, a substituted or unsubstituted C2-C60 alkynyl group, a substituted or unsubstituted C1-C60 alkoxy group, a substituted or unsubstituted C3-C10 cycloalkyl group, a substituted or unsubstituted C3-C10 cycloalkenyl group, a substituted or unsubstituted C3-C10 heterocycloalkyl group, a substituted or unsubstituted C3-C10 heterocycloalkenyl group, a substituted or unsubstituted C6-C60 aryl group, a substituted or unsubstituted C6-C60 aryloxy group, a substituted or unsubstituted C6-C60 arylthio group, a substituted or unsubstituted C2-C60 heteroaryl group, —N(Q1)(Q2), —Si(Q3)(Q4)(Q5), —C(═O)(Q6), or a binding site of an adjacent ligand via a single bond or a divalent linking group,
• Q1 to Q6 are each independently a hydrogen atom, a substituted or unsubstituted C1-C60 alkyl group, a substituted or unsubstituted C6-C60 aryl group, or a substituted or unsubstituted C2-C60 heteroaryl group;
• R3 and R4 are optionally linked to each other to form a substituted or unsubstituted C4-C20 alicyclic group, a substituted or unsubstituted C2-C20 heteroalicyclic, a substituted or unsubstituted C6-C20 aromatic group, or a substituted or unsubstituted C2-C20 heteroaromatic group;
• a is an integer 0 to 10, and when a is 2 or greater, the at least two R2s are identical to or different from each other;
• n is 1 or 2, and when n is 2, the two groups represented by
• are identical to or different from each other;
• L is an organic ligand;
• and
• m is an integer of 0 to 2;
• and
• in Formula 100,
• i) R56 and R57 are linked together to form a substituted or unsubstituted C3-C60 cyclic moiety or a substituted or unsubstituted C2-C60 heterocyclic moiety, and R51 to R55, and R58 to R60 are each independently a substituent represented by —(Ar51)q-(Ar61);
• or
• ii) R58 and R59 are linked together to form a substituted or unsubstituted C3-C60 cyclic moiety or a substituted or unsubstituted C2-C60 heterocyclic moiety, and R51 to R57, and R60 are each independently a substituent represented by —(Ar51)q-(Ar61);
• Ar50 and Ar51 are each independently selected from a substituted or unsubstituted C3-C10 cycloalkyl group, a substituted or unsubstituted C2-C10 heterocycloalkyl group, a substituted or unsubstituted C3-C10 cycloalkenyl group, C2-C10 heterocycloalkenyl group, a substituted or unsubstituted C6-C60 arylene group, or a substituted or unsubstituted C2-C60 heteroarylene group;
• Ar51 and Ar61 are each independently selected from a hydrogen atom, a deuterium atom, a halogen atom, a hydroxyl group, a cyano group, a nitro group, an amino group, an amidino group, a hydrazine, a hydrazone, a carboxyl group or a salt thereof, a sulfonic acid group or a salt thereof, a phosphoric acid group or a salt thereof, a substituted or unsubstituted C1-C60 alkyl group, a substituted or unsubstituted C2-C60 alkenyl group, a substituted or unsubstituted C2-C60 alkynyl group, a substituted or unsubstituted C1-C60 alkoxy group, a substituted or unsubstituted C3-C10 cycloalkyl group, a substituted or unsubstituted C2-C10 heterocycloalkyl group, a substituted or unsubstituted C3-C10 cycloalkenyl group, C2-C10 heterocycloalkenyl group, a substituted or unsubstituted C6-C60 aryl group, a substituted or unsubstituted C2-C60 heteroaryl group, —N(Q21)(Q22), or —Si(Q23)(Q24)(Q25);
• Q21 and Q22 are each independently selected from a substituted or unsubstituted C3-C10 cycloalkyl group, a substituted or unsubstituted C2-C10 heterocycloalkyl group, a substituted or unsubstituted C3-C10 cycloalkenyl group, a substituted or unsubstituted C2-C10 heterocycloalkenyl group, a substituted or unsubstituted C6-C60 aryl group, and a substituted or unsubstituted C2-C60 heteroaryl group;
• and Q23 to Q25 are each independently selected from among a hydrogen atom, a deuterium atom, a halogen atom, a hydroxyl group, a cyano group, a nitro group, an amino group, an amidino group, a hydrazine, a hydrazone, a carboxyl group or a salt thereof, a sulfonic acid group or a salt thereof, a phosphoric acid group or a salt thereof, a substituted or unsubstituted C1-C60 alkyl group, a substituted or unsubstituted C1-C60 alkoxy group, a substituted or unsubstituted C3-C10 cycloalkyl group, a substituted or unsubstituted C2-C10 heterocycloalkyl group, a substituted or unsubstituted C3-C10 cycloalkenyl group, a substituted or unsubstituted C2-C10 heterocycloalkenyl group, a substituted or unsubstituted C6-C60 aryl group, or a substituted or unsubstituted C2-C60 heteroaryl group;
• and
• p and q are each independently an integer of 0 to 5.