US 12,514,091 B2Granted

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

AssigneeSemiconductor Energy Laboratory Co., Ltd.

InventorsSatomi Mitsumori, Takeyoshi Watabe, Satoshi Seo, Yuko Kubota

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Abstract

A light-emitting element having low driving voltage and high emission efficiency is provided. In the light-emitting element, a combination of a guest material and a host material forms an exciplex. The guest material is capable of converting triplet excitation energy into light emission. Light emission from the light-emitting layer includes light emission from the guest material and light emission from the exciplex. The percentage of the light emission from the exciplex to the light emission from the light-emitting layer is greater than 0 percent and less than or equal to 60 percent. The energy after subtracting the energy of light emission from the exciplex from the energy of light emission from the guest material is greater than 0 eV and less than or equal to 0.23 eV.

Claims18

Dependent claims

A light-emitting element comprising:

a light-emitting layer comprising:
a first organic compound;
a second organic compound;
and
a third organic compound,
wherein one of the first organic compound and the second organic compound has a LUMO level higher than or equal to a LUMO level of the other of the first organic compound and the second organic compound, and has a HOMO level 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 is a phosphorescent compound,
wherein the second organic compound comprises a π-electron deficient heteroaromatic ring skeleton,
wherein a relation 0 eV<EG_abs−ΔEEx≤0.23 eV is satisfied where EG_abs is transition energy calculated from an absorption edge of an absorption spectrum of the first organic compound and ΔEEx is an energy difference between the HOMO level of the one of the first organic compound and the second organic compound and the LUMO level of the other of the first organic compound and the second organic compound, and
wherein an energy difference between the LUMO level and the HOMO level of the first organic compound is larger than EG_abs by 0.3 eV or more.

7 more elements

A light-emitting element comprising:

a light-emitting layer comprising:
a first organic compound;
a second organic compound;
and
a third organic compound,
wherein one of the first organic compound and the second organic compound has a LUMO level higher than or equal to a LUMO level of the other of the first organic compound and the second organic compound, and has a HOMO level 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 is a phosphorescent compound,
wherein one of the second organic compound and the third organic compound comprises a π-election deficient heteroaromatic ring skeleton,
wherein a relation 0 eV<EG_abs−ΔEEx≤0.23 eV is satisfied where EG_abs is transition energy calculated from an absorption edge of an absorption spectrum of the first organic compound and ΔEEx is an energy difference between the HOMO level of the one of the first organic compound and the second organic compound and the LUMO level of the other of the first organic compound and the second organic compound,
wherein one of the LUMO level of the second organic compound and a LUMO level of the third organic compound is higher than or equal to the other of the LUMO level of the second organic compound and the LUMO level of the third organic compound,
wherein one of the HOMO level of the second organic compound and a HOMO level of the third organic compound is higher than or equal to the other of the HOMO level of the second organic compound and the HOMO level of the third organic compound, and
wherein an energy difference between the LUMO level and the HOMO level of the first organic compound is larger than EG_abs by 0.3 eV or more.

9 more elements

A light-emitting element comprising:

a light-emitting layer comprising:
a first organic compound;
a second organic compound;
and
a third organic compound,
wherein one of the first organic compound and the second organic compound has a LUMO level higher than or equal to a LUMO level of the other of the first organic compound and the second organic compound, and has a HOMO level 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 is a phosphorescent compound,
wherein one of the second organic compound and the third organic compound comprises a π-electron deficient heteroaromatic ring skeleton,
wherein a relation 0 eV<EG_abs−ΔEEx≤0.23 eV is satisfied where EG_abs is transition energy calculated from an absorption edge of an absorption spectrum of the first organic compound and ΔEEx is an energy difference between the HOMO level of the one of the first organic compound and the second organic compound and the LUMO level of the other of the first organic compound and the second organic compound,
wherein one of the LUMO level of the second organic compound and a LUMO level of the third organic compound is higher than or equal to the other of the LUMO level of the second organic compound and the LUMO level of the third organic compound,
wherein one of the HOMO level of the second organic compound and a HOMO level of the third organic compound is higher than or equal to the other of the HOMO level of the second organic compound and the HOMO level of the third organic compound,
wherein an energy difference between the LUMO level and the HOMO level of the first organic compound is larger than EG_abs by 0.3 eV or more, and
wherein the second organic compound and the third organic compound form a first exciplex.

10 more elements

Dependencies are inferred from the claim text.

Facts

Application: 18/667,068Filed 17 May 2024 · continuation
Priority: JP 2016-10178720 May 2016
Published: US 2024/0306411 A112 Sep 2024
Granted: 30 Dec 2025
Term ends: Not estimatedThe source records don’t support an estimate.

Classification18 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 50/15
Carrier transporting layers: hole transporting layers
H10K 50/16
Carrier transporting layers: electron transporting layers

Family

Application15/598,586Parent of this division · filed 18 May 2017
Application16/518,064Parent of this division · filed 22 Jul 2019
US 10,361,388 B2Parent of this division · filed 23 Jul 2019
Application16/875,562Parent of this division · filed 15 May 2020
US 10,658,604 B2Parent of this division · filed 19 May 2020
Application17/161,982Parent of this continuation · filed 29 Jan 2021
US 10,910,576 B2Parent of this division · filed 2 Feb 2021
Application17/955,721Parent of this continuation · filed 29 Sep 2022
US 11,462,702 B2Parent of this continuation · filed 4 Oct 2022
US 2024/0306411 A1Pre-grant publication · published 12 Sep 2024
US 11,991,890 B2Parent of this continuation
Application17/161,982Parent of this division
US 2017/0338436 A1Published application
US 2019/0348625 A1Published application
US 2020/0280012 A1Published application
US 2021/0159440 A1Published application
US 2023/0109651 A1Published application
US 12,514,091 B2This patent

From the US filing history. Foreign family members aren’t listed.