US 10,096,658 B2Granted

Light-emitting element, display device, electronic device, and lighting device

AssigneeSemiconductor Energy Laboratory Co., Ltd.

InventorsTakeyoshi Watabe, Satomi Mitsumori, Nobuharu Ohsawa, Harue Osaka, Kunihiko Suzuki, Satoshi Seo

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Abstract

Providing a light-emitting element emitting light in a broad emission spectrum. A combination of a first organic compound and a second organic compound forms an exciplex. The first organic compound has a function of converting triplet-excitation energy into light emission. The lowest triplet excitation level of the second organic compound is higher than or equal to the lowest triplet excitation level of the first organic compound, and the lowest triplet excitation level of the first organic compound is higher than or equal to the lowest triplet excitation level of the exciplex. Light emission from a light-emitting layer includes light emission from the first organic compound and light emission from the exciplex.

Claims21

Dependent claims

A light-emitting element comprising:

a light-emitting layer comprising a first organic compound and a second 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 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 a combination of the first organic compound and the second organic compound forms an exciplex,
wherein the first organic compound is configured to convert triplet-excitation energy into light emission,
wherein a lowest triplet excitation level of the second organic compound is higher than or equal to a lowest triplet excitation level of the first organic compound,
wherein the lowest triplet excitation level of the first organic compound is higher than or equal to a lowest triplet excitation level of the exciplex, and
wherein light emission from the light-emitting layer comprises light emission from the first organic compound and light emission from the exciplex.

5 more elements

Dependencies are inferred from the claim text.

Facts

Application: 15/483,049Filed 10 Apr 2017
Priority: JP 2016-08654222 Apr 2016
Published: US 2017/0309687 A126 Oct 2017
Granted: 9 Oct 2018
Term ends: Not estimatedThe source records don’t support an estimate.

Classification13 codes

H10K 59/38
Devices specially adapted for multicolour light emission: comprising colour filters or colour changing media [CCM]
H10K 50/11
OLEDs or polymer light-emitting diodes [PLED]: characterised by the electroluminescent [EL] layers
H10K 59/351
Comprising red-green-blue [RGB] subpixels: comprising more than three subpixels, e.g. red-green-blue-white [RGBW]
H10K 50/15
Carrier transporting layers: hole transporting layers