Phosphor Light-Emitting Element With Electron-Blocking Intermediate Layer

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Solution Overview

Problem

Existing light-emitting elements suffer from deterioration of the hole-transport layer due to electron movement, which affects the reliability and efficiency of the device.

Innovation Solution

Incorporating an intermediate layer made of metal oxide or hydroxide between the light-emitting layer and the hole-transport layer, along with a metal layer, to reduce electron movement and protect the hole-transport layer.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a hole-transport layer is used to transport holes, then hole transport efficiency is improved, but electron blocking capability is insufficient causing layer deterioration

Engineering Contradiction:

Improvehole-transport layer durabilityVSAvoidelectron damage to hole-transport layer

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

An intermediate layer comprising metal oxide or hydroxide is introduced between the light-emitting layer and the hole-transport layer. This intermediate layer acts as an electron-blocking barrier that prevents electrons from reaching and damaging the hole-transport layer, while maintaining overall device performance and hole transport functionality.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Productivity

If electron mobility in electron-transport layer is made higher than hole mobility in hole-transport layer, then electron transport efficiency is improved, but electron leakage to hole-transport layer increases

Engineering Contradiction:

Improveelectron transport efficiencyVSAvoidhole-transport layer stability

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The intermediate layer of metal oxide or hydroxide serves as a selective barrier that blocks electrons from the high-mobility electron-transport layer from penetrating into the hole-transport layer, thereby preventing electron-induced deterioration while allowing efficient electron transport to the light-emitting layer to continue.

Inventive Principle:

Principle #24Intermediary (Mediator)

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The solution significantly reduces the deterioration of the hole-transport layer, enhancing the reliability and efficiency of the light-emitting element, particularly under high drive conditions.

Implementation Method 1

at least one intermediate layer provided between the anode and the light-emitting layer, and containing at least one of oxide of a metal or hydroxide of the metal

Methodology Applied

Scientific EffectElectron blocking: Electrical Resistance

Data Source

PatentUS12520657B2Light-emitting element and method for producing light-emitting element

Publication Date: 2026.01.06 SHARP KK

AI summary

A light-emitting element, includes: an anode; a cathode facing the anode; a light-emitting layer provided between the anode and the cathode, and containing a phosphor; and at least one intermediate layer provided between the anode and the light-emitting layer, and containing at least one of oxide of a metal or hydroxide of the metal.