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1. 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 comprising an emission layer; and at least one first layer disposed between the first electrode and the emission layer, the at least one first layer comprising a cyano group-containing compound and a hole transporting compound, wherein the first electrode comprises a zinc oxide layer comprising at least one element selected from the group consisting of aluminum (Al), indium (In), gallium (Ga), germanium (Ge), gadolinium (Gd), zirconium (Zr), molybdenum (Mo), and nickel (Ni) wherein the cyano group-containing compound comprises one of the compounds represented by Formulae 1 through 20: wherein: X1 through X4 are each independently selected from the group consisting of compounds represented by Formulae 30A through 30D below; wherein Y1 through Y8 are each independently selected from the group consisting of N and C(R103); wherein Z1 through Z4 are each independently C or N; Al and A2 are each independently selected from the group consisting of —O—, —S—, —N(R104) and —C(R105)(R106)—; wherein Q101 and Q102 are each independently selected from the group consisting of a C2-C10 alkylene group; a C2-C10 alkenylene group; and a substituted C2-C10 alkylene group and a substituted C2-C10 alkenylene group which have at least one substituent selected from the group consisting of a halogen atom, a cyano group, a hydroxyl group, a C1-C10 alkyl group and a C1-C10 alkoxy group; wherein T1 and T2 are each independently selected from the group consisting of a C5-C30 aromatic ring system; a C3-C30 heteroaromatic ring system; a substituted C5-C30 aromatic ring system and a substituted C3-C30 heteroaromatic ring system which have at least one substituent selected from the group consisting of a halogen atom, a cyano group, a hydroxyl group, a C1-C10 alkyl group, and a C1-C10 alkoxy group; wherein p is an integer from 1 to 10; wherein q is an integer from 0 to 10; wherein R101 through R106 are each independently selected from the group consisting of hydrogen; a halogen atom; a cyano group; a hydroxyl group; a C1-C10 alkyl group; a C1-C10 alkoxy group; a substituted C1-C10 alkyl group and a substituted C1-C10 alkoxy group which have at least one substituent selected from the group consisting of hydrogen, a halogen atom, a cyano group, a hydroxyl group, a C5-C14 aryl group, and a C3-C14 heteroaryl group;and —N(R107)(R108), wherein R107 and R108 are each independently selected from the group consisting of hydrogen, a C1-C10 alkyl group, a phenyl group and a biphenyl group; and
wherein L101 is selected from the group consisting of a C5-C14 arylene group; a C5-C14 heteroarylene group; and a substituted C2-C10 alkenylene group, a substituted C5-C14 arylene group and a substituted C3-C14 heteroarylene group which have at least one substituent selected from the group consisting of a halogen atom, a cyano group, a hydroxyl group, a C1-C10 alkyl group and a C1-C10 alkoxy group; wherein the hole transporting compound comprises a compound represented by Formula 41 or 42 below: wherein, R10 is represented by —(Ar1)n—Ar2; R16 is represented by —(Ar11)m—Ar12; L1 and L11 are each independently selected from the group consisting of 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 C3-C30 heteroarylene group, and —N(Q1)—; n, m, a and b are each independently an integr from 0 to 10; Ar1 and Ar11 are each independently selected from the group consisting of a C1-C10 alkylene group; a phenylene group; a naphthylene group; an anthrylene group; a fluorenylene group; a carbazolylene group; a pyrazolylene group; a pyridinylene group; a triazinylene group; —N(Q1)—; and a substituted C1-C10 alkylene group, a substituted phenylene group, a substituted naphthylene group, a substituted anthrylene group, a substituted fluorenylene group, a substituted carbazolylene group, a substituted pyrazolylene group, substituted pyridinylene group, and a substituted triazinylene group which have at least one substituent selected from the group consisting of a halogen atom, a cyano group, a hydroxyl group, a C1-C10 alkyl group, a C1-C10 alkoxy group, a phenyl group, a naphthyl group, and an anthryl group; and Q1 is selected from the group consisting of hydrogen; a C1-C10 alkyl group; a phenyl group; a naphthyl group; a carbazolyl group; a fluorenyl group; and a substituted C1-C10 alkyl group, a substituted C1-C10 alkoxy group, a substituted phenyl group, a substituted naphthyl group, a substituted carbazolyl group, and a substituted fluorenyl group which have at least one substituent selected from the group consisting of a halogen atom, a cyano group, a hydroxyl group, a C1-C10 alkyl group, a C1-C10 alkoxy group, a phenyl group, a naphthyl group, and an anthryl group; R1 through R3, R11 through R15, R17, R18, R21 through R29, Ar2, and Ar12 are each independently selected from the group consisting of hydrogen, 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 allynyl 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 C3-C30 heteroaryl group, and —N(Q2)(Q3); Q2 and Q3 are each independently selected from the group consisting of hydrogen, 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 allynyl 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, and a substituted or unsubstituted C3-C30 heteroaryl group; and wherein groups of Ar1 in —(Ar1)n— are identical to or different from each other, groups of Ar11 in —(Ar11)m— are identical to or different from each other, groups of L1 in -(L1)a- are identical to or different from each other, and groups of L11 in -(L11)b- are identical to or different from each other.
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