Title:
LIGHT EMITTING DEVICE, LIGHT EMITTING APPARATUS, ELECTRONIC EQUIPMENT, DISPLAY APPARATUS, AND LIGHTING APPARATUS
Document Type and Number:
WIPO Patent Application WO/2022/162508
Kind Code:
A1
Abstract:
The present invention provides a novel light emitting device that has excellent convenience, usefulness and reliability. This light emitting device has a first electrode, a second electrode, and a first layer, wherein the first layer is positioned between the first electrode and the second electrode, and the first layer includes a light emitting material, a first organic compound, and a first material. The light emitting material is provided with a function of emitting fluorescence, and is provided with an end part positioned at a longest wavelength of an absorption spectrum at a first wavelength. The first organic compound is provided with a function of converting triplet excitation energy into light emission, and the light emission is provided with an end part positioned at a shortest wavelength of the spectrum at a second wavelength, the second wavelength being positioned at a shorter wavelength than the first wavelength. In addition, the first organic compound is provided with a first substituent R1, the first substituent R1 being any of an alkyl group, a cycloalkyl group, or a trialkylsilyl group. The first material is provided with a function of emitting delayed fluorescence at room temperature, the difference between a HOMO level and a LUMO level of the first material being smaller than that of the first organic compound.
Inventors:
OHSAWA NOBUHARU (JP)
SEO SATOSHI (JP)
YOSHIYASU YUI (JP)
YOSHIZUMI HIDEKO (JP)
SEO SATOSHI (JP)
YOSHIYASU YUI (JP)
YOSHIZUMI HIDEKO (JP)
Application Number:
PCT/IB2022/050498
Publication Date:
August 04, 2022
Filing Date:
January 21, 2022
Export Citation:
Assignee:
SEMICONDUCTOR ENERGY LAB (JP)
International Classes:
H01L51/50; C09K11/06; G09F9/30; H01L27/32
Domestic Patent References:
| WO2019215535A1 | 2019-11-14 | |||
| WO2020095141A1 | 2020-05-14 | |||
| WO2019142555A1 | 2019-07-25 |
Foreign References:
| JP2019087743A | 2019-06-06 | |||
| JP2020017721A | 2020-01-30 | |||
| JP2018501660A | 2018-01-18 |
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