Organic light-emitting device

An organic light emitting diode comprising:

• a cathode;
• an anode;
• a light emitting layer provided between the cathode and the anode;
• a first electron transporting layer comprising a heterocyclic compound represented by the following Formula 1 and provided between the cathode and the light emitting layer to be in physical contact with the light emitting layer;
• and
• a second electron transporting layer provided between the cathode and the first electron transporting layer,
• wherein the light emitting layer comprises a host and a dopant, and a difference between a HOMO energy level of the host and a HOMO energy level of the heterocyclic compound represented by Formula 1 is 0.2 eV or more,
• wherein the second electron transporting layer includes a host material including one or two or more of compounds represented by the following Formula 3, and one or two or more n-type dopants selected from alkali metals and alkaline earth metals,
• wherein the organic light emitting diode comprises two or more light emitting layers, and comprises a charge generating layer between two adjacent light emitting layers among the two or more light emitting layers,
• wherein the charge generating layer comprises the second electron transporting layer and a p-type organic material layer, and
• wherein the first electron transporting layer is provided between an adjacent light emitting layer among the two or more light emitting layers and the second electron transporting layer:
• in Formula 1,
• Ar1 to Ar3 are different from each other,
• Ar1 and Ar2 are different from each other, and are each independently a phenyl group;
• a biphenyl group;
• a terphenyl group;
• a naphthyl group;
• or a phenanthryl group, which is unsubstituted or substituted with deuterium;
• a phenyl group;
• a naphthyl group;
• or a phenanthryl group,
• Ar3 is represented by the following Formula 2,
• in Formula 2,
• R1 and R2 are each independently hydrogen or deuterium, or optionally combine with an adjacent R1 or R2 respectively to form a fused benzene ring,
• R3 and R4 are the same as or different from each other, and each independently hydrogen;
• deuterium;
• a C1 to C10 alkyl group;
• or a phenyl group,
• L1 is a direct bond;
• a phenylene group unsubstituted or substituted with a deuterium;
• a divalent biphenyl group;
• a naphthylene group;
• or a phenanthrylene group,
• 1 is an integer of 1 to 5,
• m is an integer of 1 to 3,
• n is an integer of 1 to 4,
• when 1, m, and n are each an integer of 2 or more, two or more structures in the parenthesis are the same as or different from each other,
• in Formula 3,
• A1 and A2 are the same as or different from each other, and each independently an alkyl group having 1 to 10 carbon atoms;
• a phenyl group;
• a naphthyl group;
• or a fluorenyl group substituted with an alkyl group having 1 to 10 carbon atoms,
• L2 and L3 are the same as or different from each other, and each independently a direct bond;
• a phenylene group unsubstituted or substituted with a phenyl group;
• a naphthylene group;
• or a divalent biphenyl group,
• A is any one of the following substituted or unsubstituted structures,
• X is O;
• S;
• or CT12T13,
• and p are an integer of 1 to 3, and
• when o and p are an integer of 2 or more, two or more structures in the parenthesis are the same as or different from each other,
• T1 to T8 are hydrogen,
• T12 and T13 are the same as or different from each other, and each independently hydrogen or a C1 to C10 alkyl group.