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US 8,617,725 B2Granted
Light-emitting element, light-emitting device, and electronic appliance
AssigneeSemiconductor Energy Laboratory Co., Ltd.
InventorsTakahiro Ushikubo, Satoshi Seo
Life of this patent
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Abstract
By use of a 2,9,10-triaryl anthracene derivative in which a diarylamino-substituted aryl group is bonded to the 2-position of a 9,10-diarylanthracene for a light-emitting element, a light-emitting element having high efficiency can be obtained. The emission wavelength of the anthracene derivative is suitable for use in a white light-emitting element. By use of the anthracene derivative for a white light-emitting element, a white light-emitting element having high efficiency can be obtained.
Claims21
A light emitting device comprising:
- a first anode;
- a first light emitting layer over the first anode;
- a second light emitting layer in direct contact with the first light emitting layer;
- a first cathode over the second light emitting layer;
- a second anode over and in direct contact with the first cathode;
- a third light emitting layer over the second anode;
- and
- a second cathode over the third light emitting layer,
- wherein each of the first to third light emitting layers has a maximum emission peak,
- wherein each of the maximum emission peaks is located in one of a first wavelength region of greater than or equal to 400 nm and less than 500 nm, a second wavelength region of greater than or equal to 500 nm and less than 600 nm, and a third wavelength region of greater than or equal to 600 nm and less than 700 nm,
- wherein each of the first to third wavelength regions has only one of the maximum emission peaks,
- wherein one of the first and second light emitting layers comprises an anthracene derivative represented by a general formula (I):
- and
- wherein:
- Ar1 and Ar2 individually represent an aryl group having 6 to 25 carbon atoms;
- Ar3 represents an arylene group having 6 to 25 carbon atoms;
- A represents any of substituents represented by general formulae (1-1) to (1-3),
- Ar11 to Ar13 individually represent an aryl group having 6 to 25 carbon atoms;
- α represents an arylene group having 6 to 25 carbon atoms;
- Ar21 represents an aryl group having 6 to 25 carbon atoms;
- R31 represents any of a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, an aryl group having 6 to 25 carbon atoms, and a haloalkyl group having 1 to 4 carbon atoms;
- R32 represents any of an alkyl group having 1 to 4 carbon atoms, an aryl group having 6 to 25 carbon atoms, and a haloalkyl group having 1 to 4 carbon atoms;
- Ar31 represents an aryl group having 6 to 25 carbon atoms;
- β represents an arylene group having 6 to 25 carbon atoms;
- and
- R41 and R42 individually represent any of a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, an aryl group having 6 to 25 carbon atoms, and a haloalkyl group having 1 to 4 carbon atoms.
23 more elements
A light emitting device comprising:
- a first light emitting element and a second light emitting element which is stacked over the first light emitting element,
- wherein the first light emitting element comprises:
- a first anode;
- a first light emitting layer over the first anode;
- a second light emitting layer in direct contact with the first light emitting layer;
- and
- a first cathode over the second light emitting layer,
- wherein the second light emitting element comprises:
- a second anode over and in direct contact with the first cathode;
- a third light emitting layer over the second anode;
- a fourth light emitting layer over and in direct contact with the third light emitting layer;
- and
- a second cathode over the third light emitting layer,
- wherein one of the first and second light emitting layers comprises an anthracene derivative represented by a general formula (I):
- wherein:
- Ar1 and Ar2 individually represent an aryl group having 6 to 25 carbon atoms;
- Ar3 represents an arylene group having 6 to 25 carbon atoms;
- A represents any of substituents represented by general formulae (1-1) to (1-3),
- Ar11 to Ar13 individually represent an aryl group having 6 to 25 carbon atoms;
- α represents an arylene group having 6 to 25 carbon atoms;
- Ar21 represents an aryl group having 6 to 25 carbon atoms;
- R31 represents any of a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, an aryl group having 6 to 25 carbon atoms, and a haloalkyl group having 1 to 4 carbon atoms;
- R32 represents any of an alkyl group having 1 to 4 carbon atoms, an aryl group having 6 to 25 carbon atoms, and a haloalkyl group having 1 to 4 carbon atoms;
- Ar31 represents an aryl group having 6 to 25 carbon atoms;
- β represents an arylene group having 6 to 25 carbon atoms;
- and
- R41 and R42 individually represent any of a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, an aryl group having 6 to 25 carbon atoms, and a haloalkyl group having 1 to 4 carbon atoms.
24 more elements
Dependencies are inferred from the claim text.