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Light-emitting element, light-emitting device, electronic device, lighting device, and organic compound

專利號
US11800799B2
公開日期
2023-10-24
申請人
Semiconductor Energy Laboratory Co., Ltd.
發(fā)明人
Satoshi Seo; Takao Hamada; Tatsuyoshi Takahashi; Yasushi Kitano; Hiroki Suzuki; Hideko Inoue
IPC分類
H10K85/60; C07D403/14; H10K85/30
技術(shù)領(lǐng)域
emitting,light,2mpcczpdbq,2pcczpdbq,element,compound,in,dibenzo,layer,nm
地域： Kanagawa-ken

摘要

To provide a light-emitting element with an improved reliability, a light-emitting element with a high current efficiency (or a high quantum efficiency), and a novel dibenzo[f,h]quinoxaline derivative that is favorably used in a light-emitting element which is one embodiment of the present invention. A light-emitting element includes an EL layer between an anode and a cathode. The EL layer includes a light-emitting layer; the light-emitting layer contains a first organic compound having an electron-transport property and a hole-transport property, a second organic compound having a hole-transport property, and a light-emitting substance; the combination of the first organic compound and the second organic compound forms an exciplex; the HOMO level of the first organic compound is lower than the HOMO level of the second organic compound; and a difference between the HOMO level of the first organic compound and the HOMO level of the second organic compound is less than or equal to 0.4 eV.

說明書

This application is a continuation of copending U.S. application Ser. No. 16/570,062, filed on Sep. 13, 2019 which is a continuation of U.S. application Ser. No. 15/988,152, filed on May 24, 2018 (now U.S. Pat. No. 10,418,565 issued Sep. 17, 2019) which is a continuation of U.S. application Ser. No. 14/807,426, filed on Jul. 23, 2015 (now U.S. Pat. No. 9,985,221 issued May 29, 2018) which are all incorporated herein by reference.

BACKGROUND OF THE INVENTION 1. Field of the Invention

The present invention relates to an object, a method, or a manufacturing method. The present invention also relates to a process, a machine, manufacture, or a composition of matter. In particular, one embodiment of the present invention relates to a light-emitting element, a light-emitting device, an electronic device, a lighting device, a driving method thereof, or a manufacturing method thereof. One embodiment of the present invention further relates to an organic compound which can be used in a light-emitting element, a light-emitting device, an electronic device, and a lighting device.

2. Description of the Related Art

A light-emitting element using an organic compound as a luminous body, which has features such as thinness, lightness, high-speed response, and DC drive at low voltage, is expected to be used in a next-generation flat panel display. In particular, a display device in which light-emitting elements are arranged in a matrix is considered to have advantages in a wide viewing angle and excellent visibility over a conventional liquid crystal display device.

權(quán)利要求

1
What is claimed is:1. A light-emitting element comprising:an EL layer between an anode and a cathode,wherein the EL layer comprises a light-emitting layer,wherein the light-emitting layer comprises a first organic compound, a second organic compound, and a light-emitting substance converting triplet excitation energy into light emission,wherein a combination of the first organic compound and the second organic compound forms an exciplex,wherein the first organic compound comprises a 6-membered nitrogen-containing heteroaromatic ring and a carbazole skeleton,wherein the 6-membered nitrogen-containing heteroaromatic ring is pyrazine, pyridazine, triazine, or tetrazine,wherein a HOMO level of the first organic compound is lower than a HOMO level of the second organic compound, andwherein a difference between the HOMO level of the first organic compound and the HOMO level of the second organic compound is less than or equal to 0.4 eV.2. The light-emitting element according to claim 1, wherein a difference between the HOMO level of the first organic compound and the HOMO level of the second organic compound is less than or equal to 0.3 eV.3. A light-emitting device comprising the light-emitting element according to claim 1.4. An electronic device comprising:the light-emitting device according to claim 3; anda connection terminal or an operation key.5. A lighting device comprising:the light-emitting device according to claim 3; anda housing.6. A light-emitting element comprising:an EL layer between an anode and a cathode,wherein the EL layer comprises a light-emitting layer,wherein the light-emitting layer comprises a first organic compound, a second organic compound, and a light-emitting substance converting triplet excitation energy into light emission,wherein a combination of the first organic compound and the second organic compound forms an exciplex,wherein the first organic compound comprises a 6-membered nitrogen-containing heteroaromatic ring and a carbazole skeleton,wherein a HOMO level of the first organic compound is lower than a HOMO level of the second organic compound,wherein a difference between the HOMO level of the first organic compound and the HOMO level of the second organic compound is less than or equal to 0.4 eV, andwherein a benzene ring is condensed with the 6-membered nitrogen-containing heteroaromatic ring.7. The light-emitting element according to claim 6, wherein a difference between the HOMO level of the first organic compound and the HOMO level of the second organic compound is less than or equal to 0.3 eV.8. The light-emitting element according to claim 6, wherein the 6-membered nitrogen-containing heteroaromatic ring is pyridine, pyrazine, pyrimidine, pyridazine, triazine, or tetrazine.9. The light-emitting element according to claim 6, wherein the 6-membered nitrogen-containing heteroaromatic ring condensed with the benzene ring is quinoline, isoquinoline, dibenzo[f,h]quinolone, naphthyridine, dibenzo[f,h]quinoxaline or dibenzo[f,h]quinazoline.10. A light-emitting device comprising the light-emitting element according to claim 6.11. An electronic device comprising:the light-emitting device according to claim 10; anda connection terminal or an operation key.12. Alighting device comprising:the light-emitting device according to claim 11; anda housing.
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