Novel Organic Compound for OLED Thermal Stability and Efficiency

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Solution Overview

Problem

Existing organic electroluminescent devices face challenges with low glass transition temperature and thermal stability of organic material layers, affecting their lifespan and efficiency.

Innovation Solution

A novel organic compound with enhanced electron transport ability and thermal stability is introduced, represented by Chemical Formula 1, which can be used in various organic material layers of an electroluminescent device, including hole injection, transport, light emitting, and blocking layers, to improve device performance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Illumination intensity

If existing organic material layer materials are used, then light emission property is improved, but thermal stability deteriorates due to low glass transition temperature

Engineering Contradiction:

Improvelight emission propertyVSAvoidthermal stability

Core Design Contradiction:

Illumination intensityVSStability of the object's composition

Solution Approach 1:

The patent employs composite materials by combining the newly developed organic compound with existing organic material layer materials. This composite approach allows the device to benefit from both the excellent light emission properties of traditional materials and the superior thermal stability of the new compound, effectively resolving the contradiction between light emission performance and thermal stability.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent changes the chemical and physical parameters of the organic material layer by introducing a novel compound with specifically designed molecular structure. This compound exhibits higher glass transition temperature and improved thermal stability while maintaining or enhancing light emission properties, thus resolving the contradiction through parameter optimization.

Inventive Principle:

Principle #35Parameter changes

2Ease of manufacture

If existing organic material layer materials are used, then device manufacturing is simplified, but device lifespan deteriorates

Engineering Contradiction:

Improvedevice manufacturingVSAvoiddevice lifespan

Core Design Contradiction:

Ease of manufactureVSDuration of action of stationary object

Solution Approach 1:

The patent modifies the material parameters by introducing a compound with optimized molecular weight, glass transition temperature, and carrier mobility. These parameter changes enhance device lifespan through improved thermal stability and charge transport, while the compound's compatibility with existing manufacturing processes maintains ease of manufacture.

Inventive Principle:

Principle #35Parameter changes

3Device complexity

If existing organic material layer materials are used, then device structure is maintained, but carrier transport ability deteriorates

Engineering Contradiction:

Improvedevice structureVSAvoidcarrier transport ability

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The patent applies local quality by strategically positioning the new organic compound in specific functional layers where carrier transport is critical. The compound's superior electron or hole transport properties are localized to regions where they are most needed, improving overall carrier transport ability while maintaining the basic device structure.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent creates composite material layers combining the new compound with existing materials, achieving enhanced carrier transport ability through synergistic effects. The composite structure maintains overall device architecture while improving local transport properties in critical regions.

Inventive Principle:

Principle #40Composite materials

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 compound improves the thermal stability and carrier transport capabilities of organic electroluminescent devices, leading to reduced driving voltage, increased luminous efficiency, and extended lifespan, making them suitable for full-color display applications.

Implementation Method 1

the compound has excellent hole and electron injection and transport abilities

Methodology Applied

Scientific EffectCharge carrier transport: Conduction (electrical)

Implementation Method 2

When the injected holes and electrons meet, excitons are formed, and light emits when these excitons fall back to the ground state

Methodology Applied

Scientific EffectElectroluminescence: Electroluminescence

Data Source

PatentUS11472800B2Organic compound and organic electroluminescent device comprising the same

Publication Date: 2022.10.18 DOOSAN SOLUS CO LTD

AI summary

The present invention relates to a novel compound and an organic electroluminescent device including the same, and the compound according to the present invention is used in an organic material layer of an organic electroluminescent device, preferably an electron transport layer or a hole blocking layer, and may increase luminous efficiency, driving voltage and lifespan of the organic electroluminescent device.