Organic Compound for Light-Emitting Layer Efficiency

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Solution Overview

Problem

Current organic electric elements face challenges with low luminous efficiency, high driving voltages, and reduced lifespan due to charge imbalance and intermolecular interactions, which affect color purity and thermal stability, necessitating the development of new materials for the light emitting layer and auxiliary light emitting layer.

Innovation Solution

A compound represented by a specific formula is used in the organic material layer, including a hole injection layer, hole transport layer, light emitting layer, electron transport layer, and auxiliary light emitting layer, optimizing energy levels and inherent material properties to enhance efficiency and lifespan.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Illumination intensity

If a host/dopant system is used to improve color purity and luminous efficiency, then color purity and luminous efficiency are improved, but the maximum light emission wavelength shifts to a longer wavelength due to intermolecular interactions

Engineering Contradiction:

Improveluminous efficiencyVSAvoidcolor purity

Core Design Contradiction:

Illumination intensityVSManufacturing precision

Solution Approach 1:

The patent modifies the molecular structure parameters of the dopant by introducing specific substituents (fluorene, carbazole, triphenylamine groups) to adjust the energy level alignment and reduce unwanted intermolecular interactions, thereby maintaining color purity while achieving high luminous efficiency

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite host/dopant system where the host matrix (containing specific aromatic hydrocarbon structures) is combined with a carefully designed dopant molecule, optimizing the interaction between components to achieve both high efficiency and pure color emission

Inventive Principle:

Principle #40Composite materials

2Productivity

If the efficiency is increased, then the driving voltage is lowered, but the crystallization of organic material due to Joule heating is reduced, affecting lifespan

Engineering Contradiction:

Improveluminous efficiencyVSAvoidlifespan

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent changes the thermal and electrical parameters of the organic materials by selecting compounds with appropriate HOMO-LUMO energy gaps and mobility characteristics, enabling efficient charge transport at lower voltages and reduced Joule heating, thus extending device lifespan

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent optimizes the local properties of different layers in the organic electroluminescence device, particularly the light-emitting layer and auxiliary light-emitting layer, by using materials with tailored energy levels and thermal stability to minimize heat generation at critical interfaces

Inventive Principle:

Principle #3Local quality

3Device complexity

If only one material is used as a light emitting material, then the structure is simpler, but the maximum light emission wavelength shifts to a longer wavelength causing deterioration in color purity

Engineering Contradiction:

Improvematerial layer structureVSAvoidcolor purity

Core Design Contradiction:

Device complexityVSManufacturing precision

Solution Approach 1:

The patent segments the light-emitting function into multiple components: a host material that provides the structural framework and a dopant material that provides the emission centers, allowing independent optimization of each component to maintain color purity while achieving desired emission wavelengths

Inventive Principle:

Principle #1Segmentation

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 achieves high luminous efficiency, low driving voltages, and improved color purity and lifespan by optimizing energy levels and material properties in the organic electric element.

Implementation Method 1

a small amount of dopant having a smaller energy band gap than a host forming a light emitting layer is mixed in the light emitting layer, excitons generated in the light emitting layer are transported to the dopant, thus emitting light with high efficiency

Methodology Applied

Scientific EffectEnergy transfer: Fluorescence

Implementation Method 2

organic light emission refers to a phenomenon in which electric energy is converted into light energy by using an organic material

Methodology Applied

Scientific EffectOrganic light emission: Electroluminescence

Data Source

PatentUS11605783B2Compound for organic electronic element, organic electronic element using same and electronic device therefor

Publication Date: 2023.03.14 DUK SAN NEOLUX

AI summary

Disclosed is a compound represented by chemical formula (1). In addition, disclosed is an organic electronic element comprising: a first electrode; a second electrode; and an organic layer between the first electrode and the second electrode, wherein the organic layer contains the compound represented by chemical formula (1). Light-emitting efficiency, stability and lifespan may be enhanced when the compound represented by chemical formula (1) is contained in the organic layer.