Deuterated Composite Host Materials for Organic Electroluminescence

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Solution Overview

Problem

Existing organic electroluminescent devices face challenges in achieving high luminous efficiency, low driving voltage, and extended lifetime, with existing materials not adequately addressing these needs.

Innovation Solution

The development of an organic electroluminescent compound represented by specific formulas, combined with a plurality of host materials, where at least one host compound contains deuterium, to enhance device performance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If conventional organic electroluminescent materials are used, then device structure is simple, but luminous efficiency is low and lifetime is short

Engineering Contradiction:

Improveluminous efficiencyVSAvoidmaterial combination complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent employs composite host materials comprising a first host compound (formula 1) and a second host compound (formula 2) with specific structural features including deuterium substitution and carbazole moieties. This composite approach enables simultaneous achievement of high luminous efficiency and long lifetime by combining materials with complementary properties, resolving the contradiction between performance improvement and material complexity.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent utilizes deuterium substitution (replacing hydrogen with deuterium) in the host material structures to modify molecular properties such as bond strength, vibrational frequency, and stability. This parameter change at the molecular level enhances device lifetime and luminous efficiency without fundamentally altering the device architecture, thus improving performance while managing complexity.

Inventive Principle:

Principle #35Parameter changes

2Productivity

If phosphorescent materials are used to improve luminous efficiency, then luminous efficiency increases, but driving voltage remains high

Engineering Contradiction:

Improveluminous efficiencyVSAvoiddriving voltage

Core Design Contradiction:

ProductivityVSPower

Solution Approach 1:

The patent introduces specific functional groups and structural features (carbazole moieties, deuterium substitution) at localized positions within the host material molecules to optimize charge transport and energy transfer properties. This local structural optimization enables efficient luminescence with reduced driving voltage requirements, resolving the contradiction between luminous efficiency and power consumption.

Inventive Principle:

Principle #3Local quality

3Duration of action of stationary object

If conventional host materials are used, then material synthesis is simple, but device lifetime is short

Engineering Contradiction:

Improvedevice lifetimeVSAvoidmaterial synthesis complexity

Core Design Contradiction:

Duration of action of stationary objectVSEase of manufacture

Solution Approach 1:

The patent employs deuterium substitution in the host material structures, which modifies molecular stability and resistance to degradation. This chemical parameter change at the molecular level extends device lifetime by strengthening C-D bonds compared to C-H bonds, while the synthetic route remains based on established organic chemistry methods, thus improving lifetime without excessive manufacturing complexity.

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

The proposed compounds and host materials result in organic electroluminescent devices with lower driving voltage, higher luminous efficiency, and improved lifetime properties.

Implementation Method 1

When being deuterated to the number of the lower limit or more, the bond dissociation energy according to deuteration may increase to enhance the stability of the compound, and improved lifetime properties can be exhibited

Methodology Applied

Scientific EffectBond dissociation energy enhancement through deuteration:

Implementation Method 2

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

Methodology Applied

Scientific EffectElectroluminescence: Electroluminescence

Data Source

PatentUS20250295030A1Organic electroluminescent compound, a plurality of host materials, and organic electroluminescent device comprising the same

Publication Date: 2025.09.18 DUPONT SPECIALTY MATERIALS KOREA LTD

AI summary

The present disclosure relates to an organic electroluminescent compound represented by formula 1′ or 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 the specific combination of compounds according to the present disclosure as a host material(s), it is possible to provide an organic electroluminescent device having improved driving voltage, luminous efficiency, power efficiency and/or lifetime properties.