Self-Luminous Element Metal Fluoride Layer Structure

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Solution Overview

Problem

Existing organic EL elements face challenges in achieving balanced carrier injection and environmental resistance, leading to reduced operating life due to insufficient hole block and electron injection properties, particularly when using alkali metal fluoride intermediate layers and hole block layers.

Innovation Solution

A self-luminous EL element structure is developed, featuring a light-emitting layer with a metal fluoride first functional layer and an electron transport layer without alkali metals, alkaline earth metals, or rare earth metals, which prevents dissociation of sodium fluoride and enhances electron injection properties, improving carrier balance and environmental resistance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If an intermediate layer formed from alkali metal fluoride is provided between the electron transport layer and the organic light-emitting layer, then electron injection properties are increased, but the metal fluoride may dissociate and reduce environmental resistance

Engineering Contradiction:

Improveelectron injection propertiesVSAvoidenvironmental resistance

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent introduces a hole block layer as an intermediary between the alkali metal fluoride intermediate layer and the organic light-emitting layer. This hole block layer prevents direct contact between the intermediate layer and the light-emitting layer, thereby preventing dissociation of the metal fluoride while maintaining electron injection properties through the intermediate layer.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent segments the functional layers by introducing a distinct hole block layer separate from the intermediate layer. This segmentation allows the intermediate layer to perform electron injection without directly exposing the organic light-emitting layer to potentially harmful alkali metal fluoride, thus resolving the contradiction between electron injection properties and environmental resistance.

Inventive Principle:

Principle #1Segmentation

2Reliability

If a hole block layer is added adjacent to the light-emitting layer, then hole block properties are improved, but device structure becomes more complex

Engineering Contradiction:

Improvehole block propertiesVSAvoidlayer structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent designs the hole block layer to serve multiple functions: it blocks holes from the light-emitting layer, prevents dissociation of the intermediate layer, and maintains carrier balance. By making this single layer multi-functional, the patent achieves improved hole block properties without proportionally increasing device complexity.

Inventive Principle:

Principle #6Universality (Multi-functionality)

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

This structure significantly increases the operating life of organic EL elements by preventing moisture penetration and maintaining effective hole block and electron injection properties, resulting in improved luminous efficiency and reduced drive voltage.

Implementation Method 1

The second functional layer does not include at least one metallic element selected from the group consisting of alkali metals, alkaline earth metals, and rare earth metals that reduce the metal fluoride

Methodology Applied

Scientific EffectDissociation prevention:

Implementation Method 2

This structure significantly increases the operating life of organic EL elements by preventing moisture penetration

Methodology Applied

Scientific EffectMoisture barrier:

Implementation Method 3

When driven, a voltage is applied across the electrode pair, and holes injected to the organic light-emitting layer from the anode and electrons injected to the organic light-emitting layer from the cathode recombine to emit light

Methodology Applied

Scientific EffectElectroluminescence: Electroluminescence

Data Source

PatentUS11508928B2Self-luminous element and self-luminous display panel

Publication Date: 2022.11.22 MAGNOLIA BLUE CORP

AI summary

A self-luminous element includes: a pixel electrode; a light-emitting layer that is disposed above the pixel electrode and includes a light-emitting material; a first functional layer that is disposed on the light-emitting layer and includes a metal fluoride; a second functional layer that is disposed on the first functional layer and includes a first organic material having at least one of electron transport properties and electron injection properties; and a counter electrode that is disposed above the second functional layer. The second functional layer does not include at least one metallic element selected from the group consisting of alkali metals, alkaline earth metals, and rare earth metals that reduce the metal fluoride.