CPC H10K 50/131 (2023.02) [H10K 50/11 (2023.02); H10K 50/121 (2023.02); H10K 50/15 (2023.02); H10K 50/16 (2023.02); H10K 59/32 (2023.02); H10K 85/342 (2023.02); H10K 85/611 (2023.02); H10K 85/615 (2023.02); H10K 85/622 (2023.02); H10K 85/626 (2023.02); H10K 85/633 (2023.02); H10K 85/636 (2023.02); H10K 85/654 (2023.02); H10K 85/6572 (2023.02); H10K 85/6576 (2023.02); H10K 2101/10 (2023.02); H10K 2101/27 (2023.02); H10K 2101/90 (2023.02); H10K 2102/351 (2023.02)] | 19 Claims |
1. A light-emitting element comprising:
a pair of electrodes; and
an EL layer between the pair of electrodes,
wherein the EL layer comprises a first light-emitting layer, a second light-emitting layer, and a first layer between the first light-emitting layer and the second light-emitting layer,
wherein an emission spectrum of the first light-emitting layer is in a shorter wavelength region than an emission spectrum of the second light-emitting layer,
wherein the first light-emitting layer comprises a fluorescent substance and a host material,
wherein the fluorescent substance is capable of emitting light in the first light-emitting layer,
wherein the second light-emitting layer comprises a substance, a first organic compound and a second organic compound,
wherein the substance is capable of converting triplet excitation energy into luminescence in the second light-emitting layer,
wherein the first organic compound and the second organic compound are configured to form an exciplex,
wherein the fluorescent substance comprises a pyrene skeleton,
wherein the host material comprises a condensed aromatic ring, and
wherein a T1 level of the host material is lower than a T1 level of the first organic compound and a T1 level of the second organic compound.
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