OLED Host Material Composition for Low-Voltage High-Efficiency Emission

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Solution Overview

Problem

Existing organic electroluminescent devices (OLEDs) face challenges in achieving high luminous efficiency, low driving voltage, and long lifespan, with previous materials and combinations not adequately addressing these requirements.

Innovation Solution

The development of an electroluminescent compound represented by specific formulas, combined with a plurality of host materials comprising at least one first and one second host compound, to enhance device performance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of energy

If conventional phosphorescent materials are used in OLEDs, then luminous efficiency is improved, but driving voltage remains high and lifespan is limited

Engineering Contradiction:

Improveluminous efficiencyVSAvoiddriving voltage

Core Design Contradiction:

Loss of energyVSPower

Solution Approach 1:

The patent changes the chemical structure parameters of host materials by introducing specific functional groups (carbazole, triphenylene, phenanthrene units) and adjusting molecular weights to optimize device performance. This structural parameter optimization enables simultaneous improvement in luminous efficiency and reduction in driving voltage

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent employs composite host material systems combining multiple organic compounds with complementary properties. The composite approach allows synergistic effects where different materials contribute to charge transport, exciton management, and stability, achieving high luminous efficiency with reduced driving voltage

Inventive Principle:

Principle #40Composite materials

2Loss of energy

If conventional phosphorescent materials are used in OLEDs, then luminous efficiency is improved, but lifespan is limited

Engineering Contradiction:

Improveluminous efficiencyVSAvoidlifespan

Core Design Contradiction:

Loss of energyVSDuration of action of stationary object

Solution Approach 1:

The patent optimizes molecular weight parameters and structural stability of host materials to enhance device lifespan. By carefully selecting molecular weights and introducing stable aromatic structures, the material degradation rate is reduced while maintaining high luminous efficiency

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent uses purely organic compounds that can be precisely controlled and replaced, avoiding the complexity of phosphorescent materials. The organic host materials offer sufficient stability for commercial applications while enabling better control over device lifetime through material composition optimization

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

3Reliability

If new organic electroluminescent compounds with specific structures are developed, then device performance is improved, but material synthesis complexity increases

Engineering Contradiction:

Improvedevice performanceVSAvoidmaterial structure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent divides complex host material structures into modular functional units (carbazole groups, triphenylene cores, phenanthrene units) that can be independently synthesized and then assembled. This segmentation simplifies the overall synthesis process while maintaining the performance benefits of complex structures

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent develops host material structures that perform multiple functions simultaneously: charge transport, exciton confinement, and thermal management. By designing molecules with multifunctional groups, the patent reduces the need for separate materials, simplifying device construction while improving performance

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

The proposed compounds and host materials result in an organic electroluminescent device with low driving voltage, high luminous efficiency, and extended lifespan, suitable for display and lighting applications.

Implementation Method 1

Organic electroluminescent compound

Methodology Applied

Scientific EffectElectroluminescence: Electroluminescence

Data Source

PatentUS12520718B2Organic electroluminescent compound, a plurality of host materials and organic electroluminescent device comprising the same

Publication Date: 2026.01.06 DUPONT SPECIALTY MATERIALS KOREA LTD

AI summary

The present disclosure relates to an organic electroluminescent compound represented by formula 2′, a plurality of host materials comprising at least one first host compound and at least one second host compound, and an organic electroluminescent device comprising the same. By comprising the organic electroluminescent compound or a specific combination of compounds of the present disclosure, it is possible to provide an organic electroluminescent device having improved driving voltage, luminous efficiency, power efficiency, and/or lifespan characteristics.