Organic Host Compound for High Luminous Efficiency and Stability

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Solution Overview

Problem

Current organic electronic elements face challenges in achieving high luminous efficiency, stability, and lifespan due to limitations in the organic material layers, particularly the host material for the emitting layer, which affects color purity and is prone to degradation from Joule heating and metal oxide penetration.

Innovation Solution

A novel compound with a specific structure is introduced, represented by Formula (1), which is used in the organic electronic element to enhance luminous efficiency, stability, and lifespan by acting as a host or dopant in the emitting layer, reducing driving voltage and improving heat resistance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Illumination intensity

If a conventional host material is used in the emitting layer, then the device can operate, but the color purity is lowered and luminous efficiency is reduced due to intermolecular interaction and emission attenuation

Engineering Contradiction:

Improvecolor purityVSAvoidluminous efficiency

Core Design Contradiction:

Illumination intensityVSLoss of energy

Solution Approach 1:

The patent applies parameter changes by carefully controlling the molecular weight, glass transition temperature, and chemical structure of the host material to optimize its properties. Specifically, the host material is designed with a glass transition temperature of 80°C to 150°C and specific molecular weight ranges to minimize intermolecular interaction while maximizing energy transfer efficiency to the dopant, thereby simultaneously improving color purity and luminous efficiency

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent employs composite materials by creating a host-dopant system where the host material and dopant are specifically selected and combined. The host material serves as the matrix while the dopant provides the emission function, and their composite structure enables efficient energy transfer while maintaining high color purity through minimized host emission attenuation

Inventive Principle:

Principle #40Composite materials

2Productivity

If the organic material layer is improved for higher efficiency, then luminous efficiency increases, but the material becomes more susceptible to degradation from Joule heating and metal oxide penetration, reducing lifespan

Engineering Contradiction:

Improveluminous efficiencyVSAvoidlifespan

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent applies parameter changes by optimizing the glass transition temperature of the host material to be within 80°C to 150°C. This specific temperature range provides sufficient thermal stability to resist Joule heating degradation while maintaining the material's ability to achieve high luminous efficiency through effective energy transfer to the dopant

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent employs a host material with specific molecular characteristics that balance performance and stability. The material is designed to provide the necessary functional properties for high efficiency operation while having sufficient thermal and chemical stability to resist degradation from Joule heating and metal oxide penetration, effectively extending device lifespan

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

3Use of energy by stationary object

If the driving voltage is reduced to improve efficiency, then energy consumption decreases, but the organic materials are more prone to crystallization from Joule heating, reducing device stability

Engineering Contradiction:

Improvepower consumptionVSAvoiddevice stability

Core Design Contradiction:

Use of energy by stationary objectVSStability of the object's composition

Solution Approach 1:

The patent applies parameter changes by selecting a host material with a glass transition temperature of 80°C to 150°C and specific molecular weight characteristics. This parameter optimization allows the material to maintain compositional stability and resist crystallization even at reduced driving voltages where Joule heating effects are more pronounced, while still achieving low power consumption through high luminous efficiency

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 significantly improves luminous efficiency, color purity, and lifespan while reducing driving voltage, achieving stable performance and long-term durability in organic electronic devices.

Implementation Method 1

excitons generated in the emitting layer are transported to the dopant to emit light with high efficiency

Methodology Applied

Scientific EffectEnergy transfer:

Implementation Method 2

organic light emitting phenomenon refers to a phenomenon that converts electric energy into light energy by using an organic material

Methodology Applied

Scientific EffectElectroluminescence: Electroluminescence

Implementation Method 3

Joule heating generated during device driving

Methodology Applied

Scientific EffectJoule heating: Joule Heating

Data Source

PatentUS20220131091A1Compound for organic electronic element, organic electronic element using the same, and an electronic device thereof

Publication Date: 2022.04.28 DUK SAN NEOLUX

AI summary

Provided are a compound of Formula (1) for use in an organic electronic element and capable of improving the luminous efficiency, stability and lifespan of the organic electronic element, an organic electronic element employing the compound, and an electronic device thereof.