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 4, and one or two or more n-type dopants selected from alkali metals and alkaline earth metals:
• in Formula 1,
• Ar1 to Ar3 are different from each other,
• Ar1 is a phenyl group unsubstituted or substituted with deuterium;
• a biphenyl group;
• a naphthyl group;
• or a phenanthryl group,
• Ar2 is a phenyl group;
• a biphenyl group;
• a terphenyl group;
• a naphthyl group;
• or a phenanthryl group, each of 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 hydrogen;
• a tert-butyl group;
• or a phenyl group, 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;
• a methyl group;
• a phenyl group unsubstituted or substituted with a methyl group;
• or a biphenyl 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,
• l is an integer of 1,
• m is an integer of 1 to 3,
• n is an integer of 1 to 4,
• when 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 4,
• q is an integer of 1 to 4,
• r is an integer of 1 to 8, and
• when q and r are an integer of 2 or more, two or more structures in the parenthesis are the same as or different from each other,
• T9 and T10 are the same as or different from each other, and each independently hydrogen;
• or the following structure, or combine with an adjacent group to form a substituted or unsubstituted hydrocarbon ring or a substituted or unsubstituted hetero ring, and
• at least one of T9 and T10 has the following structure,
• L4 is a direct bond;
• a phenylene group;
• a biphenylylene group;
• a naphthalene group;
• a fluorenylene group substituted with a methyl group;
• a fluorenylene group substituted with a phenyl group;
• a spirobifluorenylene group;
• a pyrenylene group;
• a phenylene-naphthylene group;
• a phenylene-pyrenylene group;
• fluorenylene substituted with a phenylene-methyl group;
• fluorenylene substituted with a phenylene-phenyl group;
• or a spirofluorenylene group,
• X1 is O,
• Ar4 and Ar5 are the same as or different from each other, and each independently a phenyl group or a naphthyl group.