Organic Electroluminescent Compound for High Efficiency and Stability

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Solution Overview

Problem

Current organic electroluminescent devices face challenges with low glass transition temperature, poor thermal stability, high driving voltage, and short operational lifespan, despite using phosphorescent host materials that enhance luminous efficiency.

Innovation Solution

An organic electroluminescent compound represented by a specific formula is introduced, which can be used in various layers of the device, offering improved luminous efficiency and lifespan characteristics.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If phosphorescent host materials (CBP, BCP, BAlq) are used to enhance luminous efficiency, then current efficiency is improved, but glass transition temperature decreases and thermal stability deteriorates

Engineering Contradiction:

Improveluminous efficiencyVSAvoidthermal stability

Core Design Contradiction:

ProductivityVSStability of the object's composition

Solution Approach 1:

The patent uses composite host materials comprising multiple components with different functions. Specifically, it combines materials with high glass transition temperatures (for thermal stability) with phosphorescent dopants (for high luminous efficiency). This composite approach allows the device to simultaneously achieve both thermal stability and high luminous efficiency that cannot be obtained with single materials alone.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent systematically varies the glass transition temperature parameter of host materials by selecting different chemical compounds with progressively higher Tg values. By changing this physical parameter of the host material, the invention achieves improved thermal stability while maintaining phosphorescent emission characteristics through careful selection of host-guest combinations.

Inventive Principle:

Principle #35Parameter changes

2Productivity

If phosphorescent host materials are used to improve current efficiency, then luminous efficiency is enhanced, but driving voltage increases significantly

Engineering Contradiction:

Improvecurrent efficiencyVSAvoiddriving voltage

Core Design Contradiction:

ProductivityVSStress or pressure

Solution Approach 1:

The patent applies local quality by creating distinct functional layers with different material properties optimized for specific roles. The hole transport layer, electron transport layer, and light-emitting layer each use materials with locally optimized characteristics. This layered approach with localized material optimization allows efficient charge transport and recombination at appropriate potentials, reducing overall driving voltage while maintaining high current efficiency.

Inventive Principle:

Principle #3Local quality

3Illumination intensity

If conventional host materials are used to achieve good luminous characteristics, then light emission is improved, but operational lifespan decreases

Engineering Contradiction:

Improveluminous characteristicsVSAvoidoperational lifespan

Core Design Contradiction:

Illumination intensityVSDuration of action of stationary object

Solution Approach 1:

The patent employs beforehand cushioning by selecting host materials with inherently high thermal and chemical stability that can withstand operational stresses without degradation. By pre-selecting materials with high glass transition temperatures and excellent chemical inertness, the invention cushions against degradation mechanisms that would otherwise limit operational lifespan, thereby extending device lifetime while maintaining luminous characteristics.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

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 enhances the luminous efficiency and extends the lifespan of organic electroluminescent devices while reducing the driving voltage, providing a more stable and efficient light-emitting performance.

Implementation Method 1

Methodology Applied

Scientific EffectElectroluminescence: Electroluminescence

Data Source

PatentUS20210184137A1Organic electroluminescent compound and organic electroluminescent device comprising the same

Publication Date: 2021.06.17 DUPONT SPECIALTY MATERIALS KOREA LTD

AI summary

The present disclosure relates to an organic electroluminescent compound and an organic electroluminescent device comprising the same. The organic electroluminescent compound of the present disclosure may be comprised in a light-emitting layer, and is effective for producing an organic electroluminescent device having high luminescent efficiency and/or excellent lifespan characteristic.