Light-emitting element, display device, electronic device, and lighting device
AssigneeSemiconductor Energy Laboratory Co., Ltd.
InventorsTakahiro ISHISONE, Satoshi SEO
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Abstract
A light-emitting element having high luminous efficiency is provided. The light-emitting element includes a first organic compound, a second organic compound, and a third organic compound. The first organic compound and the second organic compound, in combination, are capable of forming an exciplex. The first organic compound is a phosphorescent compound and the third organic compound is a fluorescent compound. Light emitted from the light-emitting element includes light emitted from the third organic compound to which excitation energy is supplied from the exciplex formed by the first organic compound and the second organic compound.
Claims30
A light-emitting element comprising:
- a light-emitting layer,
- wherein the light-emitting layer comprises a first organic compound, a second organic compound, and a third organic compound,
- wherein a LUMO level of one of the first organic compound and the second organic compound is higher than or equal to a LUMO level of the other of the first organic compound and the second organic compound,
- wherein a HOMO level of the one of the first organic compound and the second organic compound is higher than or equal to a HOMO level of the other of the first organic compound and the second organic compound,
- wherein the first organic compound and the second organic compound, in combination, are capable of forming an exciplex,
- wherein the first organic compound is capable of converting triplet excitation energy into light emission,
- wherein the third organic compound is capable of converting singlet excitation energy into light emission, and
- wherein light emitted from the light-emitting layer comprises light emitted from the third organic compound.
A light-emitting element comprising:
- a light-emitting layer,
- wherein the light-emitting layer comprises a first organic compound, a second organic compound, and a third organic compound,
- wherein a LUMO level of one of the first organic compound and the second organic compound is higher than or equal to a LUMO level of the other of the first organic compound and the second organic compound,
- wherein a HOMO level of the one of the first organic compound and the second organic compound is higher than or equal to a HOMO level of the other of the first organic compound and the second organic compound,
- wherein the first organic compound and the second organic compound, in combination, are capable of forming an exciplex,
- wherein the first organic compound is capable of emitting no fluorescence and emitting phosphorescence,
- wherein the third organic compound is capable of emitting fluorescence, and
- wherein light emitted from the light-emitting layer comprises light emitted from the third organic compound.
A light-emitting element comprising:
- a light-emitting layer,
- wherein the light-emitting layer comprises a first organic compound, a second organic compound, and a third organic compound,
- wherein a LUMO level of the first organic compound is higher than or equal to a LUMO level of the second organic compound,
- wherein a HOMO level of the first organic compound is higher than or equal to a HOMO level of the second organic compound,
- wherein the first organic compound and the second organic compound, in combination, are capable of forming an exciplex,
- wherein the first organic compound comprises Ru, Rh, Pd, Os, Ir, or Pt, and
- wherein light emitted from the light-emitting layer comprises light emitted from the third organic compound.
Dependencies are inferred from the claim text.