Organic Electroluminescent Element Silver Electrode Stability

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Solution Overview

Problem

Existing organic electroluminescent elements face challenges in improving device characteristics without compromising current-carrying stability, particularly due to issues with film thickness and resistance in electrode layers.

Innovation Solution

The organic electroluminescent element incorporates a silver electrode layer with a ytterbium electron injection layer and a film thickness adjusting layer with higher resistance, positioned between the organic light-emitting layer and a second reflective layer, along with a wiring layer for current supply, to enhance light emission characteristics and maintain stability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If the film thickness of the electrode layer is reduced to improve device characteristics, then the light emission efficiency is improved, but the current-carrying stability deteriorates

Engineering Contradiction:

Improvelight emission efficiencyVSAvoidcurrent-carrying stability

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The electrode layer is segmented into multiple layers: a first electrode layer (silver) for current conduction and a second electrode layer (aluminum) for protection and additional conduction. This segmentation allows each layer to specialize - the silver layer can be thin for efficiency while the aluminum layer provides stability, resolving the contradiction between light emission efficiency and current-carrying stability.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The invention uses a composite electrode structure combining silver and aluminum layers. The silver layer provides high electrical conductivity with minimal thickness for efficiency, while the aluminum layer adds mechanical stability and electrical reliability. This composite approach enables thin overall thickness for improved light emission while maintaining current-carrying stability through the combined properties of both materials.

Inventive Principle:

Principle #40Composite materials

2Productivity

If the film thickness of the electrode layer is reduced to enhance light emission, then the device performance is improved, but the resistance increases

Engineering Contradiction:

Improvedevice performanceVSAvoidresistance

Core Design Contradiction:

ProductivityVSLoss of energy

Solution Approach 1:

The electrode function is segmented between silver (high conductivity, low resistance) and aluminum (structural support, additional conduction path). This allows the total electrode thickness to be reduced for better light emission while the silver segment maintains low resistance through its superior electrical properties.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The invention changes the material composition parameters of the electrode layers, using silver's high electrical conductivity to compensate for reduced thickness. By adjusting the material parameter (choosing silver over single-layer aluminum), the system achieves both thin thickness for light emission and low resistance for energy efficiency.

Inventive Principle:

Principle #35Parameter changes

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 configuration improves device characteristics by optimizing light emission and reducing voltage drop, while maintaining current-carrying stability even with thinner electrode layers, thereby enhancing the performance and longevity of organic electroluminescent units and electronic apparatuses.

Implementation Method 1

an ytterbium electron injection layer, wherein the ytterbium electron injection layer is in contact with the silver electrode layer on side of the organic light-emitting layer

Methodology Applied

Scientific EffectElectron injection: Electron Beam

Implementation Method 2

an organic light-emitting layer, wherein the organic light-emitting layer is provided between the first reflective layer and the second reflective layer, and emits monochromatic light

Methodology Applied

Scientific EffectElectroluminescence: Electroluminescence

Implementation Method 3

a first reflective layer; a second reflective layer, wherein the organic light-emitting layer is provided between the first reflective layer and the second reflective layer

Methodology Applied

Scientific EffectLight reflection: Reflection

Data Source

PatentUS10529953B2Organic electroluminescent element, organic electroluminescent unit, and electronic apparatus

Publication Date: 2020.01.07 MAGNOLIA BLUE CORP

AI summary

An organic electroluminescent element according to one embodiment of the disclosure includes a first reflective layer, a second reflective layer, an organic light-emitting layer, a silver electrode layer, and an ytterbium electron injection layer. The organic light-emitting layer is provided between the first reflective layer and the second reflective layer, and emits monochromatic light. The silver electrode layer is provided between the organic light-emitting layer and the second reflective layer. The ytterbium electron injection layer is in contact with the silver electrode layer on side of the organic light-emitting layer.