Organic light-emitting device

An organic light-emitting device, comprising:

• a substrate;
• a first electrode on the substrate;
• a second electrode;
• an organic layer between the first electrode and the second electrode, the organic layer including an emission layer;
• and
• a first layer including a cyano group-containing compound and a hole transporting compound, the first layer being between the first electrode and the emission layer and a distance between the first layer and the emission layer being about 50 Å or greater,
• wherein:
• the first electrode includes an Al-based reflective layer and a transparent conductive layer sequentially stacked on the substrate, the Al-based reflective layer including a first element and nickel (Ni),
• the first element includes at least one of lanthanum (La), cerium (Ce), praseodymium (Pr), promethium (Pm), samarium (Sm), europium (Eu), gadolinium (Gd), terbium (Tb), dysprosium (Dy), holmium (Ho), erbium (Er), thulium (Tm), ytterbium (Yb), and lutetium (Lu), and
• the hole transporting compound includes a compound represented by Formula 41 or 42 below:
• wherein R10 is represented by —(Ar1)n—Ar2;
• R16 is represented by —(Ar11)m—Ar12;
• Ar1, Ar11, L1, and L11 are each independently a substituted or unsubstituted C1-C30 alkylene group, a substituted or unsubstituted C2-C30 alkenylene group, a substituted or unsubstituted C5-C30 arylene group, a substituted or unsubstituted C4-C30 heteroarylene group, or a group represented by —N(Q1)-;
• n, m, a, and b are each independently an integer from 0 to 10;
• R1 through R3, R11 through R15, R17, R18, R21 through R29, Ar2, Ar12 and Q1 are each independently a hydrogen atom, a halogen atom, a hydroxyl group, a cyano group, a substituted or unsubstituted C1-C30 alkyl group, a substituted or unsubstituted C2-C30 alkenyl group, a substituted or unsubstituted C2-C30 alkynyl group, a substituted or unsubstituted C1-C30 alkoxy group, a substituted or unsubstituted C1-C30 alkylthiol group, a substituted or unsubstituted C5-C30 aryl group, a C4-C30 heteroaryl group, or a group represented by —N(Q2)(Q3);
• and
• Q2 and Q3 are each independently a hydrogen atom, a halogen atom, a hydroxyl group, a cyano group, a substituted or unsubstituted C1-C30 alkyl group, a substituted or unsubstituted C2-C30 alkenyl group, a substituted or unsubstituted C2-C30 alkynyl group, a substituted or unsubstituted C1-C30 alkoxy group, a substituted or unsubstituted C1-C30 alkylthiol group, a substituted or unsubstituted C5-C30 aryl group, or a substituted or unsubstituted C4-C30 heteroaryl group,
• wherein n groups of Ar1 in —(Ar1)n— are identical to or different from each other, m groups of Ar11 in —(Ar11)m— are identical to or different from each other, a groups of L1 in -(L1)a- are identical to or different from each other, and b groups of L11 in -(L11)b- are identical to or different from each other.