Organic compound and organic light-emitting element

An organic compound represented by the following formula [1]:

• A-(B)m [1]
• wherein the organic compound satisfies (i) and (ii),
• (i) T1 of the unit A<T1 of the unit B, and
• (ii) highest occupied molecular orbital (HOMO)-lowest unoccupied molecular orbital (LUMO) orbitals responsible for T1 transition are present in the unit A, and
• the organic compound is represented by the following formula [2-1] or [2-2]:
• wherein R1 is independently selected from a deuterium atom, substituted or unsubstituted alkyl groups, substituted or unsubstituted aryl groups, and substituted or unsubstituted heterocyclic groups, provided that R1 is bonded via a carbon atom when R1 denotes a substituted or unsubstituted heterocyclic group,
• m denotes an integer of 1 or more and 5 or less, and n denotes an integer of 0 or more and 4 or less, and
• the unit B is a fused ring with a partial structure represented by the following formula [3-1] or [3-2] or is a combination of the fused ring and a substituted or unsubstituted aromatic ring, and is bonded to the unit A via a carbon atom,
• wherein X is selected from an oxygen atom, a sulfur atom, a selenium atom, and a tellurium atom, and
• rings C to E independently denote a single ring and may have a deuterium atom or a substituted or unsubstituted alkyl group.