Organic compound and organic light-emitting device

An organic light-emitting device, comprising, in sequence:

• a first electrode;
• a light-emitting layer;
• and
• a second electrode,
• wherein the light-emitting layer contains a dopant material and a first compound having a higher lowest excited triplet energy level than the dopant material,
• the dopant material is a compound represented by general formula [1], and
• the first compound is a hydrocarbon compound,
• where in formula [1], R1 to R14 are each independently selected from a hydrogen atom, a deuterium atom, a halogen atom, a cyano group, a substituted or unsubstituted alkyl group, a substituted or unsubstituted aralkyl group, a substituted or unsubstituted alkoxy group, a substituted or unsubstituted aryloxy group, a substituted or unsubstituted heteroaryloxy group, a substituted or unsubstituted aryl group, and a substituted or unsubstituted heterocyclic group, provided that R1 to R14 do not contain a Si atom,
• m is an integer of 1 or more and 3 or less, and n is an integer of 0 or more and 2 or less, provided that m+n is 3,
• X is a bidentate ligand, and a partial structure IrX is any of structures represented by general formulae [2] and [3]:
• where in formulae [2] and [3], R21 to R23, and R31 to R38 are each independently selected from a hydrogen atom, a deuterium atom, a halogen atom, a cyano group, a substituted or unsubstituted alkyl group, a substituted or unsubstituted aralkyl group, a substituted or unsubstituted alkoxy group, a substituted or unsubstituted aryloxy group, a substituted or unsubstituted heteroaryloxy group, a substituted or unsubstituted aryl group, and a substituted or unsubstituted heterocyclic group,
• adjacent groups of R35 to R38 are optionally taken together to form a ring, and
• wherein at least one of R11 to R14 is a tert-butyl group.

An organic light-emitting device, comprising, in sequence:

• a first electrode;
• a light-emitting layer;
• and
• a second electrode,
• wherein the light-emitting layer contains a dopant material and a first compound having a higher lowest excited triplet energy level than the dopant material,
• the dopant material is a compound represented by general formula [1], and
• the first compound is a hydrocarbon compound,
• where in formula [1], R1 to R14 are each independently selected from a hydrogen atom, a deuterium atom, a halogen atom, a cyano group, a substituted or unsubstituted alkyl group, a substituted or unsubstituted aralkyl group, a substituted or unsubstituted alkoxy group, a substituted or unsubstituted aryloxy group, a substituted or unsubstituted heteroaryloxy group, a substituted or unsubstituted aryl group, and a substituted or unsubstituted heterocyclic group, provided that R1 to R14 do not contain a Si atom,
• m is an integer of 1 or more and 3 or less, and n is an integer of 0 or more and 2 or less, provided that m+n is 3,
• X is a bidentate ligand, and a partial structure IrX is any of structures represented by general formulae [2] and [3]:
• where in formulae [2] and [3], R21 to R23, and R31 to R38 are each independently selected from a hydrogen atom, a deuterium atom, a halogen atom, a cyano group, a substituted or unsubstituted alkyl group, a substituted or unsubstituted aralkyl group, a substituted or unsubstituted alkoxy group, a substituted or unsubstituted aryloxy group, a substituted or unsubstituted heteroaryloxy group, a substituted or unsubstituted aryl group, and a substituted or unsubstituted heterocyclic group,
• adjacent groups of R35 to R38 are optionally taken together to form a ring, and
• wherein the light-emitting layer further contains a second compound, and the second compound has a lower lowest unoccupied molecular orbital (LUMO) level than the first compound (farther from the vacuum level).