Organic Electroluminescent Compound for Low Voltage Efficiency

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Solution Overview

Problem

Current organic electroluminescent devices face issues with short operational lifespan, high driving voltage, and low power efficiency due to thermal stress and the use of materials with low glass transition temperature and high hole mobility, which affects charge balance and quantum yield.

Innovation Solution

An organic electroluminescent compound represented by specific formulas, allowing for the development of devices with low driving voltage, improved current and power efficiencies, and extended lifespan, by optimizing the structure and composition of the hole transport layer.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

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

Engineering Contradiction:

Improvecurrent efficiencyVSAvoiddriving voltage

Core Design Contradiction:

ProductivityVSStress or pressure

Solution Approach 1:

The patent modifies the molecular structure of hole transport materials by introducing specific substituents and fused ring systems, changing physical parameters such as glass transition temperature and hole mobility to achieve optimal balance between current efficiency and driving voltage

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The invention creates composite hole transport materials combining multiple functional groups (carbazole, indole, quinoxaline units) to achieve synergistic effects that simultaneously improve current efficiency while maintaining acceptable driving voltage levels

Inventive Principle:

Principle #40Composite materials

2Productivity

If conventional hole transport materials are used to improve hole transport efficiency, then hole transport is enhanced, but thermal stress increases reducing device lifespan

Engineering Contradiction:

Improvehole transport efficiencyVSAvoiddevice lifespan

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent systematically varies structural parameters of hole transport materials, particularly glass transition temperature through substituent selection, to achieve optimal thermal stability that reduces thermal stress during high-current operation while maintaining hole transport efficiency

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The invention develops hole transport materials with optimized molecular structures that resist thermal degradation, effectively extending device operational life by preventing material breakdown under thermal stress conditions

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

3Productivity

If materials with high hole mobility are used to improve hole transport, then hole transport is enhanced, but charge balance is broken reducing quantum yield

Engineering Contradiction:

Improvehole transport efficiencyVSAvoidquantum yield

Core Design Contradiction:

ProductivityVSLoss of energy

Solution Approach 1:

The patent precisely adjusts hole mobility parameters through molecular structure optimization, introducing substituents that fine-tune charge transport characteristics to achieve balanced electron-hole recombination and maximize quantum yield

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS9935274B2Substituted 12H-indolo[2,3-b]quinoxalino[2′,3′:4,5]pyrrolo[3,2,1-jk]carbazoles as organic electroluminescent materials

Publication Date: 2018.04.03 DUPONT SPECIALTY MATERIALS KOREA LTD

AI summary

The present invention relates to an organic compound represented by the following formula 1. The organic compound according to the present invention can produce an organic electroluminescent device having low driving voltage, excellent current and power efficiencies, and remarkably improved driving lifespan.