OLED Hole Transport Material for Low-Voltage, Long-Life Emission

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Solution Overview

Problem

Current organic light-emitting devices face challenges with low hole mobility and high power consumption due to the use of carbazole-based hole transport materials, which limit efficiency and lifespan.

Innovation Solution

A novel compound with a non-carbazole-based amine derivative structure, featuring a dibenzothiophene or dibenzofuran framework, is introduced for use in the hole transport layer, enhancing hole mobility and thermal/electrical stability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Speed

If carbazole-based hole transport materials are used, then the device structure is established, but hole mobility is low and power consumption is high

Engineering Contradiction:

Improvehole mobilityVSAvoidpower consumption

Core Design Contradiction:

SpeedVSUse of energy by moving object

Solution Approach 1:

The patent changes the chemical structure parameters of hole transport materials by replacing carbazole-based compounds with non-carbazole-based amine derivatives featuring dibenzothiophene or dibenzofuran frameworks. This structural parameter change results in improved hole mobility and reduced power consumption without sacrificing device functionality

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent introduces composite material systems combining dibenzothiophene or dibenzofuran frameworks with amine derivatives to create new hole transport materials. These composite structures achieve superior hole mobility and electrical stability compared to conventional carbazole-based materials, thereby reducing power consumption

Inventive Principle:

Principle #40Composite materials

2Productivity

If carbazole-based hole transport materials are used, then the device can operate, but efficiency is limited and lifespan is reduced

Engineering Contradiction:

Improvedevice efficiencyVSAvoidlifespan

Core Design Contradiction:

ProductivityVSDuration of action of stationary object

Solution Approach 1:

The patent modifies the chemical and physical parameters of hole transport materials by adopting non-carbazole-based amine derivatives with dibenzothiophene or dibenzofuran structures. These parameter changes enhance charge transport efficiency and improve device lifespan through superior thermal and electrical stability

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent moves away from conventional carbazole-based materials that exhibit limited efficiency and lifespan toward novel amine derivative structures that provide enhanced durability and performance, effectively replacing short-living materials with more robust alternatives

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

3Speed

If novel non-carbazole-based amine derivative compounds are used, then hole mobility and stability are improved, but drive voltage is initially high

Engineering Contradiction:

Improvehole mobilityVSAvoiddrive voltage

Core Design Contradiction:

SpeedVSStress or pressure

Solution Approach 1:

The patent optimizes the molecular parameters of dibenzothiophene or dibenzofuran-based amine derivatives to achieve the right balance between hole mobility and drive voltage. By adjusting structural parameters such as substituent groups and molecular weight, the material achieves high hole mobility while maintaining manageable drive voltage levels

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS11895911B2Organic light emitting device

Publication Date: 2024.02.06 LG DISPLAY CO LTD

AI summary

The present disclosure provides an organic light-emitting device comprising a novel compound. When the novel compound is applied as a hole transport material to an organic light emitting device, the novel compound allows the device to have improved drive voltage, efficiency and lifespan characteristics.