Light-emitting element, display device, electronic device, and lighting device
AssigneeSemiconductor Energy Laboratory Co., Ltd.
InventorsNobuharu Ohsawa, Satoshi Seo
Life of this patent
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Abstract
An object is to provide a light-emitting element with high emission efficiency. The light-emitting element contains first to third organic compounds. The first organic compound has a function of converting triplet excitation energy into light. The second organic compound has a benzofuropyrimidine skeleton or a benzothienopyrimidine skeleton. The third organic compound is a fluorescent compound. Light emitted from the light-emitting element is light emitted from the third organic compound that receives excitation energy from the first organic compound or from an exciplex formed by the first and second organic compounds.
Claims25
A light-emitting device comprising:
- a first electrode;
- a light-emitting layer over the first electrode, the light-emitting layer comprising:
- a first organic compound configured to convert triplet excitation energy into light;
- a second organic compound having one of a benzofuropyrimidine skeleton and a benzothienopyrimidine skeleton;
- and
- a third organic compound configured to convert singlet excitation energy into light;
- and
- a second electrode over the light-emitting layer,
- wherein light emitted from the light-emitting layer comprises light emitted from the third organic compound, and
- wherein the first organic compound comprises one of Ru, Rh, Pd, Os, Ir and Pt.
A light-emitting device comprising:
- a first electrode;
- a light-emitting layer over the first electrode, the light-emitting layer comprising:
- a first organic compound configured to convert triplet excitation energy into light;
- a second organic compound having one of a benzofuropyrimidine skeleton and a benzothienopyrimidine skeleton;
- and
- a third organic compound configured to convert singlet excitation energy into light;
- and
- a second electrode over the light-emitting layer,
- wherein the first organic compound and the second organic compound are capable of forming an exciplex, and
- wherein light emitted from the light-emitting layer comprises light emitted from the third organic compound.
Dependencies are inferred from the claim text.