CPC H10K 85/6572 (2023.02) [C07D 487/04 (2013.01); C07D 519/00 (2013.01); C09K 11/06 (2013.01); C09K 2211/1018 (2013.01); H10K 50/11 (2023.02); H10K 2101/90 (2023.02)] | 9 Claims |
1. An organic electroluminescent device, comprising one or more light-emitting layers between an anode and a cathode opposite to each other, wherein at least one of the light-emitting layers contains a thermally activated delayed fluorescent material represented by the following general formula (1) as a light-emitting dopant:
where D1 and D2 each independently represent a nitrogen-containing heterocycle represented by the formula (1a), a ring Y in the formula (1a) of one of D1 or D2 is represented by formula (1 a-1), and the ring Y in the formula (1a) of the other of D1 or D2 is represented by the formula (1 a-2) or (1 a-3), and when the ring Y is represented by the formula (1 a-2), the ring Y is fused at a position d, and when the ring Y is represented by the formula (1a-3), the ring Y is fused at a position g, h, or i, X1 and X2 each independently represent O, S, or N—R6, R1 to R6 each independently represent an aliphatic hydrocarbon group having 1 to 8 carbon atoms, an aromatic hydrocarbon group having 6 to 10 carbon atoms, or an aromatic heterocyclic group having 3 to 12 carbon atoms, A represents a cyano group, a, b, c, and e each independently represent an integer of from 0 to 4, and f represents an integer of from 0 to 2.
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