Anthracene-Based Organic Compound for Blue OLED Efficiency

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Solution Overview

Problem

Conventional blue fluorescent electroluminescent devices have limitations in thermal stability and emission efficiency, necessitating the development of a luminescent material with improved electron injection, transport, and luminescence abilities.

Innovation Solution

A novel anthracene-based organic compound with a heteroaromatic ring moiety or aromatic ring moiety is introduced, featuring a divalent linker comprising a nitrogen-containing six-membered heteroarylene group, enhancing electron transport and injection capabilities and serving as a host material or electron transport auxiliary layer in organic electroluminescent devices.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional blue fluorescent light-emitting layer materials (DPVBi, dinaphtylanthracene) are used, then the device can be manufactured with existing materials, but the thermal stability and emission efficiency remain unsatisfactory

Engineering Contradiction:

Improvethermal stabilityVSAvoidmaterial availability

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent modifies the molecular structure parameters of conventional blue fluorescent materials by introducing specific substituents at various positions of benzene rings, creating derivatives with improved thermal stability while maintaining manufacturability through established synthesis routes

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The invention combines multiple functional moieties (light-emitting units, electron transport units, hole transport units) into composite molecular structures, achieving both improved thermal stability and emission efficiency while using commercially available building blocks

Inventive Principle:

Principle #40Composite materials

2Reliability

If conventional blue fluorescent light-emitting layer materials are used, then the device structure remains simple, but the emission efficiency and carrier transport properties are insufficient

Engineering Contradiction:

Improveemission efficiencyVSAvoidmaterial structure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent designs light-emitting layer materials that simultaneously perform multiple functions: light emission, electron transport, and hole transport, thereby improving emission efficiency and carrier transport without requiring separate functional layers or complex device structures

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The invention merges previously separate functional units (emissive units, electron transport units, hole transport units) into single integrated molecular structures, achieving improved performance while maintaining relatively simple device architecture

Inventive Principle:

Principle #5Merging (Combining)

3Reliability

If phosphorescent host materials with heavy transition-metal atoms (Ir, Pt) are used, then the emission efficiency increases four times compared to fluorescent devices, but the cost and manufacturing complexity increase significantly

Engineering Contradiction:

Improveemission efficiencyVSAvoidmanufacturing cost

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent employs organic fluorescent materials with shorter lifetimes and lower costs as alternatives to expensive phosphorescent materials, achieving acceptable emission efficiency through molecular design optimization without requiring rare metal complexes

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

Solution Approach 2:

The invention changes the fundamental emission mechanism parameters from phosphorescent (triplet exciton decay) to fluorescent (singlet exciton decay), utilizing substituents on benzene rings to optimize emission properties while avoiding the need for heavy metal atoms

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 compound improves the driving voltage, emission efficiency, and lifespan of organic electroluminescent devices, maximizing the performance of full-color display panels by enhancing electron transport and recombination capabilities between holes and electrons.

Implementation Method 1

excellent electron injection and transport and light-emitting abilities

Methodology Applied

Scientific EffectElectron transport: Conduction (electrical)

Implementation Method 2

The injected holes and electrons recombine with each other to generate excitons which then return to the ground state, emitting light

Methodology Applied

Scientific EffectElectroluminescence: Electroluminescence

Data Source

PatentUS11667622B2Organic light emitting compound and organic electroluminescence device using same

Publication Date: 2023.06.06 SOLUS ADVANCED MATERIALS CO LTD

AI summary

The present invention relates to a novel compound having excellent functions, such as electron injection and transport and light emission functions, and an organic electroluminescence device. By using the novel compound in an organic material layer of the organic electroluminescence device, properties of the device such a light emitting efficiency, driving voltage, and life can be improved.