Organic light-emitting device

An organic light-emitting device, comprising, in this order:

• a first electrode;
• a first light-emitting unit;
• a charge generation region;
• a second light-emitting unit;
• and
• a second electrode,
• wherein the charge generation region includes at least one n-type charge generation layer,
• the at least one n-type charge generation layer contains at least a first organic compound and a second organic compound,
• the first organic compound is a nitrogen-containing aromatic compound, and
• the second organic compound is represented by the following General Formula [I] or [II]:
• where, in General Formulae [I] and [II], X1 to X8 each represent a carbon atom having a substituent R or a nitrogen atom;
• Y in General Formula [I] represents a carbon atom having substituents R1 and R2, or any of an oxygen atom, a sulfur atom, a selenium atom, and a tellurium atom;
• when Y in General Formula [I] represents a carbon atom having substituents R1 and R2, at least one of X1 to X8 represents a nitrogen atom;
• when the second organic compound is represented by General Formula [II], at least one of X1 to X8 represents a nitrogen atom;
• R, R1, and R2 are each selected from a hydrogen atom, a deuterium atom, a halogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group, a substituted or unsubstituted heterocyclic group, a substituted or unsubstituted amino group, a substituted or unsubstituted silyl group, a substituted or unsubstituted alkoxy group, and a cyano group;
• in General Formulae [I] and [II], when, among X1 to X8, carbon atoms each having a substituent R are adjacent to each other and each substituent R has a carbon atom, the adjacent substituents R are optionally taken together to form a ring;
• and
• in General Formula [I], when R1 and R2 each have a carbon atom, the adjacent substituents R1 and R2 are optionally taken together to form a ring.