US 12,727,321 B2Granted

Light-emitting device, light-emitting apparatus, electronic device, and lighting device

AssigneeSemiconductor Energy Laboratory Co., Ltd.

InventorsNobuharu Ohsawa, Satoshi Seo

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Abstract

A novel light-emitting device that is highly convenient, useful, or reliable is provided. A light-emitting device including a second electrode over a first electrode with an EL layer sandwiched therebetween is provided. The EL layer includes a light-emitting layer and an oxidation-resistant layer over the light-emitting layer. The EL layer includes a side surface. The light-emitting device includes a block layer in contact with a top surface and the side surface of the EL layer. The second electrode is in contact with the side surface of the EL layer through the block layer. The oxidation-resistant layer includes any one or a plurality of oxides of metals belonging to Group 4 to Group 8 of the periodic table and an organic compound having an electron-withdrawing group.

Claims9

Dependent claims

A light-emitting device comprising a first electrode, a hole-injection layer, a hole-transport layer, a light-emitting layer, an electron-transport layer, an electron-injection layer, an oxidation-resistant layer, a block layer, and a second electrode,

wherein the hole-injection layer is located between the first electrode and the hole-transport layer,
wherein the hole-transport layer is located between the hole-injection layer and the light-emitting layer,
wherein the light-emitting layer is located between the hole-transport layer and the electron-transport layer,
wherein the electron-transport layer is located between the light-emitting layer and the
electron-injection layer,
wherein the electron-injection layer is located between the electron-transport layer and the oxidation-resistant layer,
wherein the oxidation-resistant layer is located between the electron-injection layer and the second electrode,
wherein the block layer is in contact with a side surface of the hole-injection layer, a side surface of the hole-transport layer, a side surface of the light-emitting layer, a side surface of the electron-transport layer, a side surface of the electron-injection layer, a side surface of the oxidation-resistant layer, a top surface of the oxidation-resistant layer, and the second electrode,
wherein the second electrode faces the side surface of the hole-injection layer, the side surface of the hole-transport layer, the side surface of the light-emitting layer, the side surface of the electron-transport layer, the side surface of the electron-injection layer, the side surface of the oxidation-resistant layer, and the top surface of the oxidation-resistant layer through the block layer, and
wherein the block layer comprises a hole-transport material.

7 more elements

A light-emitting apparatus comprising:

a first light-emitting device;
a second light-emitting device;
and
a partition,
wherein the first light-emitting device comprises a first electrode, a hole-injection layer, a hole-transport layer, a light-emitting layer, an electron-transport layer, an electron-injection layer, an oxidation-resistant layer, a block layer, and a second electrode,
wherein the hole-injection layer is located between the first electrode and the hole-transport layer,
wherein the hole-transport layer is located between the hole-injection layer and the light-emitting layer,
wherein the light-emitting layer is located between the hole-transport layer and the electron-transport layer,
wherein the electron-transport layer is located between the light-emitting layer and the electron-injection layer,
wherein the electron-injection layer is located between the electron-transport layer and the oxidation-resistant layer,
wherein the oxidation-resistant layer is located between the electron-injection layer and the second electrode,
wherein the block layer is in contact with a side surface of the hole-injection layer, a side surface of the hole-transport layer, a side surface of the light-emitting layer, a side surface of the electron-transport layer, a side surface of the electron-injection layer, a side surface of the oxidation-resistant layer, a top surface of the oxidation-resistant layer, and the second electrode,
wherein the second electrode faces the side surface of the hole-injection layer, the side surface of the hole-transport layer, the side surface of the light-emitting layer, the side surface of the electron-transport layer, the side surface of the electron-injection layer, the side surface of the oxidation-resistant layer, and the top surface of the oxidation-resistant layer through the block layer,
wherein the second light-emitting device comprises a third electrode and the second electrode,
wherein the partition comprises a first opening and a second opening,
wherein the first opening and the first electrode overlap each other,
wherein the second opening and the third electrode overlap each other, and
wherein the block layer comprises a hole-transport material.

15 more elements

Dependencies are inferred from the claim text.

Facts

Application: 18/266,908Filed 6 Dec 2021
Priority: JP 2020-21017418 Dec 2020
Published: US 2024/0065024 A122 Feb 2024
Granted: 1 Sep 2026
Term ends: Not estimatedThe source records don’t support an estimate.

Classification12 codes

H10K 50/181
Carrier blocking layers: electron blocking layers
H05B 33/12
Electroluminescent light sources: light sources with substantially two-dimensional [2D] radiating surfaces
H05B 33/22
Light sources with substantially two-dimensional [2D] radiating surfaces: characterised by the chemical or physical composition or the arrangement…
H10K 50/157
Hole transporting layers: between the light-emitting layer and the cathode