Composite Host Materials for Organic Electronic Elements

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Current organic electronic elements face challenges with low charge carrier mobility and oxidation stability, particularly in phosphorescent host materials, where the LUMO and HOMO levels of the host material significantly impact efficiency and lifespan, and there is a need for improved energy transfer methods from host to dopant materials.

Innovation Solution

Incorporating a specific second host material in combination with a first host material in the phosphorescent emitting layer to control the HOMO level, reducing energy barriers and maximizing charge balance, thereby enhancing efficiency and lifespan.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If a single host material is used in the phosphorescent emitting layer, then the device structure is simple, but the charge carrier mobility and oxidation stability are low

Engineering Contradiction:

Improvehost material structureVSAvoidcharge carrier mobility and oxidation stability

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The patent employs a composite host material system consisting of a first host material (Formula 1) and a second host material (Formula 2) in specific weight ratios (70:30 to 30:70). This composite structure combines the advantages of both materials to achieve high charge carrier mobility and oxidation stability while maintaining device simplicity. The first host material provides structural framework and the second host material enhances charge transport and stability properties.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent optimizes the HOMO level parameter of the host material by selecting specific compounds with controlled HOMO levels (5.8-6.5 eV). By changing the HOMO level parameter through material selection and composition ratio adjustment, the device achieves improved charge carrier mobility and oxidation stability without significant structural complexity increase.

Inventive Principle:

Principle #35Parameter changes

2Loss of energy

If the HOMO level of the host material is not controlled, then the energy barrier is high, but controlling the HOMO level requires precise material selection and composition

Engineering Contradiction:

Improveenergy barrierVSAvoidmaterial selection and composition control

Core Design Contradiction:

Loss of energyVSDevice complexity

Solution Approach 1:

The patent systematically controls the HOMO level parameter within a specific range (5.8-6.5 eV) by selecting host materials with appropriate molecular structures and adjusting their composition ratios. This parameter control reduces the energy barrier for charge carrier injection and transport. The patent provides specific guidance on HOMO level selection and composition ratios to achieve optimal energy barrier reduction.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

By creating a composite host system with specific weight ratios (70:30 to 30:70), the patent achieves balanced HOMO level control that reduces energy barriers while maintaining material stability and device manufacturability. The composite structure allows fine-tuning of the HOMO level through composition adjustment without requiring complete material redesign.

Inventive Principle:

Principle #40Composite materials

3Productivity

If charge balance is not maximized, then the efficiency is low, but maximizing charge balance requires optimized host material combination and ratios

Engineering Contradiction:

Improveluminous efficiencyVSAvoidhost material combination and ratio optimization

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent uses a composite host material system with optimized weight ratios (70:30 to 30:70) to achieve balanced charge carrier transport. The first host material (Formula 1) and second host material (Formula 2) work synergistically to maximize charge balance, resulting in high luminous efficiency. The specific ratio range provides optimal charge balance while maintaining manufacturing simplicity.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent assigns different functional roles to the first and second host materials in the composite system. The first host material primarily provides structural support and basic charge transport, while the second host material enhances charge balance and stability. This functional differentiation within the composite achieves maximum charge balance efficiency.

Inventive Principle:

Principle #3Local quality

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 approach results in high luminous efficiency and extended lifespan of organic electronic devices with reduced driving voltage.

Implementation Method 1

there is a need for improved energy transfer methods from host to dopant materials

Methodology Applied

Scientific EffectEnergy transfer:

Implementation Method 2

phosphorescent host materials

Methodology Applied

Scientific EffectPhosphorescence: Phosphorescence

Data Source

PatentUS12108662B2Compound for organic electronic element, organic electronic element using same and electronic device therefor

Publication Date: 2024.10.01 DUK SAN NEOLUX

AI summary

Provided are an organic electronic element and an electronic device therefor, wherein the organic electronic element has a mixture of a compound according to the present invention used as material for an organic layer thereof, thereby enabling the achievement of high light-emitting efficiency and low driving voltage of the organic electronic element, and enabling the life of the element to be greatly extended.