OLED Host Material Pairing for Low-Temperature Deposition

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Solution Overview

Problem

Existing organic electroluminescent devices face challenges with materials that degrade at high deposition temperatures, leading to deteriorated luminescent properties and reduced device performance, necessitating the development of host materials with improved thermal stability and electronic properties.

Innovation Solution

The combination of specific compounds represented by formulas 1 and 2 as host materials, which separate hole and electron properties, allows for deposition at lower temperatures, enhancing thermal stability and improving luminous efficiency and device lifetime.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If high molecular weight materials are used to improve hole and electron properties, then luminescent properties are improved, but deposition temperature must be increased which causes material denaturation and deteriorates luminescent properties

Engineering Contradiction:

Improveluminescent propertiesVSAvoiddeposition temperature

Core Design Contradiction:

ReliabilityVSTemperature

Solution Approach 1:

The patent divides the host material function into two separate compounds: one primarily providing hole transport properties and another primarily providing electron transport properties. This segmentation allows each compound to be deposited at lower temperatures without requiring high molecular weight materials, thus avoiding thermal denaturation while maintaining excellent luminescent properties

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent creates a composite host material system by combining two specific compounds (formula 1 and formula 2) that have complementary properties. This composite approach enables the achievement of superior hole and electron properties without relying on high molecular weight materials that would require high deposition temperatures and cause denaturation

Inventive Principle:

Principle #40Composite materials

2Reliability

If high deposition temperature is applied to deposit materials with improved hole and electron properties, then material performance is improved, but the material is denatured and luminescent properties deteriorate

Engineering Contradiction:

Improvehole and electron propertiesVSAvoidmaterial thermal stability

Core Design Contradiction:

ReliabilityVSStability of the object's composition

Solution Approach 1:

The patent changes the molecular structure parameters of the host materials by introducing specific heteroaryl groups and functional groups in formulas 1 and 2, which enables the materials to achieve excellent hole and electron properties at lower deposition temperatures. This parameter change allows the materials to maintain their structural integrity without denaturation while still providing superior electronic properties

Inventive Principle:

Principle #35Parameter changes

3Ease of manufacture

If conventional host materials are used, then deposition can be performed, but luminous efficiency and device lifetime are insufficient

Engineering Contradiction:

Improvedeposition processabilityVSAvoidluminous efficiency and lifetime

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The patent introduces two specific compound structures (formulas 1 and 2) as intermediary host materials that mediate between the electrode and the dopant. These compounds provide optimal hole and electron transport properties, enabling efficient charge injection and transport at lower deposition temperatures, which results in higher luminous efficiency and longer device lifetime without compromising manufacturability

Inventive Principle:

Principle #24Intermediary (Mediator)

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 combination results in organic electroluminescent devices with lower driving voltage, higher luminous efficiency, and longer lifetime, while maintaining favorable thermal denaturation conditions.

Implementation Method 1

The light-emitting materials are required to have high quantum efficiency, high movement degree of an electron and a hole

Methodology Applied

Scientific EffectCharge transport: Conduction (electrical)

Implementation Method 2

An OLED changes electric energy into light by applying electricity to an organic light-emitting material

Methodology Applied

Scientific EffectElectroluminescence: Electroluminescence

Implementation Method 3

a host material should have high purity and a suitable molecular weight in order to be deposited under vacuum

Methodology Applied

Scientific EffectVacuum deposition: Physical Vapour Deposition

Data Source

PatentUS20260076092A1Plurality of host materials and organic electroluminescent device comprising the same

Publication Date: 2026.03.12 DUPONT SPECIALTY MATERIALS KOREA LTD

AI summary

The present disclosure relates to a plurality of host materials and organic electroluminescent devices comprising the same. The present disclosure may provide a plurality of host materials having a composition favorable to thermal denaturation due to a low deposition temperature, while improving hole properties and electronic properties of HOMO and LUMO, by comprising separate compounds represented by formulas 1 and 2 into a light-emitting layer. By comprising the plurality of host materials of the present disclosure, it is possible to provide an organic electroluminescent device having a lower driving voltage, higher luminous efficiency and/or longer lifetime.