An organic light-emitting device, comprising: a substrate; a first electrode disposed on the substrate; a second electrode; an organic layer disposed between the first electrode and the second electrode, the organic layer including a hole transport layer, an emission layer and an electron transport layer; and a layer disposed between the first electrode and the hole transport layer, the layer including at least one cyano group-containing compound, characterized in that the electron transport layer includes an anthracene-based compound and a quinolate-based compound, wherein the layer further includes a hole transporting compound and the hole transporting compound is one of Formula 42 and Compounds 1 through 37: wherein, in Formula 42, R 10 is represented by -(Ar 1) n -Ar 2; R 16 is represented by -(Ar 11) m -Ar 12; Ar 1, Ar 11, and L 11 are each independently a substituted or unsubstituted C 1 -C 30 alkylene group, a substituted or unsubstituted C 2 -C 30 alkenylene group, a substituted or unsubstituted C 5 -C 30 arylene group, a substituted or unsubstituted C 4 -C 30 heteroarylene group, or -N(Q 1)-; n, m, and b are each independently an integer from 0 to 10; R 11 through R 15, R 17, R 18, R 21 through R 29, Ar 2, Ar 12, and Q 1 are each independently hydrogen, a halogen atom, a hydroxyl group, a cyano group, a substituted or unsubstituted C 1 -C 30 alkyl group, a substituted or unsubstituted C 2 -C 30 alkenyl group, a substituted or unsubstituted C 2 -C 30 alkynyl group, a substituted or unsubstituted C 1 -C 30 alkoxy group, a substituted or unsubstituted C 1 -C 30 alkylthiol group, a substituted or unsubstituted C 5 -C 30 aryl group, a C 4 - C30 heteroaryl group, or -N(Q 2)(Q 3); Q 2 and Q 3 are each independently hydrogen, a halogen atom, a hydroxyl group, a cyano group, a substituted or unsubstituted C 1 -C 30 alkyl group, a substituted or unsubstituted C 2 -C 30 alkenyl group, a substituted or unsubstituted C 2 -C 30 alkynyl group, a substituted or unsubstituted C 1 -C 30 alkoxy group, a substituted or unsubstituted C 1 -C 30 alkylthiol group, a substituted or unsubstituted C 5 -C 30 aryl group, or a substituted or unsubstituted C 4 -C 30 heteroaryl group; and n groups of Ar 1 in -(Ar 1) n - are identical to or different from each other, m groups of Ar 11 in -(Ar 11) m - are identical to or different from each other, and b groups of L 11 in -(L 11) b - are identical to or different from each other; a substrate; a first electrode disposed on the substrate; a second electrode; an organic layer disposed between the first electrode and the second electrode, the organic layer including a hole transport layer, an emission layer and an electron transport layer; and a layer disposed between the first electrode and the hole transport layer, the layer including at least one cyano group-containing compound, characterized in that the electron transport layer includes an anthracene-based compound and a quinolate-based compound, R 10 is represented by -(Ar 1) n -Ar 2; R 16 is represented by -(Ar 11) m -Ar 12; Ar 1, Ar 11, and L 11 are each independently a substituted or unsubstituted C 1 -C 30 alkylene group, a substituted or unsubstituted C 2 -C 30 alkenylene group, a substituted or unsubstituted C 5 -C 30 arylene group, a substituted or unsubstituted C 4 -C 30 heteroarylene group, or -N(Q 1)-; n, m, and b are each independently an integer from 0 to 10; R 11 through R 15, R 17, R 18, R 21 through R 29, Ar 2, Ar 12, and Q 1 are each independently hydrogen, a halogen atom, a hydroxyl group, a cyano group, a substituted or unsubstituted C 1 -C 30 alkyl group, a substituted or unsubstituted C 2 -C 30 alkenyl group, a substituted or unsubstituted C 2 -C 30 alkynyl group, a substituted or unsubstituted C 1 -C 30 alkoxy group, a substituted or unsubstituted C 1 -C 30 alkylthiol group, a substituted or unsubstituted C 5 -C 30 aryl group, a C 4 - C30 heteroaryl group, or -N(Q 2)(Q 3); Q 2 and Q 3 are each independently hydrogen, a halogen atom, a hydroxyl group, a cyano group, a substituted or unsubstituted C 1 -C 30 alkyl group, a substituted or unsubstituted C 2 -C 30 alkenyl group, a substituted or unsubstituted C 2 -C 30 alkynyl group, a substituted or unsubstituted C 1 -C 30 alkoxy group, a substituted or unsubstituted C 1 -C 30 alkylthiol group, a substituted or unsubstituted C 5 -C 30 aryl group, or a substituted or unsubstituted C 4 -C 30 heteroaryl group; and n groups of Ar 1 in -(Ar 1) n - are identical to or different from each other, m groups of Ar 11 in -(Ar 11) m - are identical to or different from each other, and b groups of L 11 in -(L 11) b - are identical to or different from each other;