CPC H10K 59/35 (2023.02) [H10K 50/11 (2023.02); H10K 50/12 (2023.02); H10K 50/13 (2023.02); H10K 50/15 (2023.02); H10K 50/16 (2023.02); H10K 50/17 (2023.02); H10K 50/171 (2023.02); H10K 50/18 (2023.02); H10K 50/81 (2023.02); H10K 50/828 (2023.02); H10K 50/85 (2023.02); H10K 50/865 (2023.02); H10K 59/12 (2023.02); H10K 50/841 (2023.02); H10K 85/342 (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 85/6572 (2023.02); H10K 85/6576 (2023.02); H10K 2101/10 (2023.02); H10K 2101/30 (2023.02)] | 12 Claims |
1. A light-emitting device comprising:
a first light-emitting layer, a second light-emitting layer, and a third light-emitting layer between a first electrode and a second electrode,
wherein the first light-emitting layer is between the first electrode and the second light-emitting layer,
wherein the second light-emitting layer is between the first light-emitting layer and the third light-emitting layer,
wherein the third light-emitting layer is between the second light-emitting layer and the second electrode,
wherein the first light-emitting layer comprises a host material and a fluorescent substance,
wherein the second light-emitting layer comprises a first phosphorescent substance, a first organic compound, and a second organic compound,
wherein the third light-emitting layer comprises a second phosphorescent substance, a third organic compound, and a fourth organic compound,
wherein the first organic compound and the second organic compound form a first exciplex,
wherein the third organic compound and the fourth organic compound form a second exciplex,
wherein the second organic compound comprises an aromatic amine skeleton or a carbazole skeleton,
wherein the fourth organic compound comprises an aromatic amine skeleton or a carbazole skeleton,
wherein a peak wavelength of an emission spectrum of the fluorescent substance is shorter than a peak wavelength of an emission spectrum of the first phosphorescent substance,
wherein the peak wavelength of the emission spectrum of the fluorescent substance is shorter than a peak wavelength of an emission spectrum of the second phosphorescent substance,
wherein the peak wavelength of the emission spectrum of the second phosphorescent substance is shorter than the peak wavelength of the emission spectrum of the first phosphorescent substance, and
wherein a triplet excitation level (T1) of the host material is lower than a triplet excitation level (T1) of the fluorescent substance.
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