Light-emitting element, light-emitting device, electronic device, lighting device, lighting system, and guidance system

By employing a multilayer structure and organic materials with specific energy levels in organic electroluminescent elements, the problem of low hole injection efficiency has been solved, resulting in a high-efficiency, long-lifetime, and low-power light-emitting element.

CN113773298BActive Publication Date: 2026-06-16SEMICON ENERGY LAB CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SEMICON ENERGY LAB CO LTD
Filing Date
2016-12-06
Publication Date
2026-06-16

AI Technical Summary

⚠Technical Problem

In existing organic electroluminescent devices, the hole injection efficiency is low, resulting in insufficient luminous efficiency and lifetime, making it difficult to meet the requirements of high efficiency and durability.

⚗Method used

A multilayer light-emitting element is used, wherein the hole injection layer contains an organic acceptor, and the first hole transport layer, the second hole transport layer and the third hole transport layer each contain organic materials with specific energy levels. By adjusting the HOMO energy level difference, holes are successfully injected and diffused within the light-emitting layer. A triarylamine compound with a dibenzofuran or dibenzothiophene skeleton directly or through a divalent aromatic hydrocarbon group bonded to the nitrogen of an amine is used as the second hole transport material.

🎯Benefits of technology

It improves hole injection efficiency, extends the lifespan of light-emitting elements, enhances luminous efficiency and reliability, and reduces power consumption.

✦ Generated by Eureka AI based on patent content.

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Abstract

The objective is to provide a long-lifetime light-emitting element. The light-emitting element includes: a first electrode; a second electrode; and an EL layer, wherein the EL layer includes a hole injection layer and four layers (first to fourth). The hole injection layer contains an organic acceptor and is located between the first electrode and the first layer. The first layer contains a first hole transport material, the second layer contains a second hole transport material and is located between the first and third layers, the third layer contains a third hole transport material, and the fourth layer contains a host material and a light-emitting material and is located between the third layer and the second electrode. The HOMO level of the second hole transport material is deeper than the HOMO level of the first hole transport material, the HOMO level of the host material is deeper than the HOMO level of the second hole transport material, the HOMO level of the third hole transport material is equal to or deeper than the HOMO level of the host material, the difference between the HOMO levels of the second and third hole transport materials is less than 0.3 eV, and the second hole transport material is a triarylamine compound having a dibenzofuran skeleton or a dibenzothiophene skeleton directly or through a divalent aromatic hydrocarbon group bonded to the nitrogen of an amine.
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