Organic Electroluminescent Compound for Lower Driving Voltage

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Solution Overview

Problem

Current organic electroluminescent elements face challenges in achieving high luminous efficiency and long lifetime due to issues with driving voltage and thermal stability, particularly in portable displays where power consumption is a concern, and existing materials do not adequately support optimal energy balance across layers.

Innovation Solution

A specific compound is introduced, represented by a formula, which is used as a host material in the light-emitting layer to improve luminous efficiency and lifetime by lowering driving voltage, and is incorporated into the organic electroluminescent element structure, including a hole injection layer, transport layers, and an electron injection layer.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional organic materials are used in the organic material layer, then the element can operate, but the driving voltage is high and the lifetime is short due to Joule heating and material deterioration

Engineering Contradiction:

Improveelement lifetimeVSAvoiddriving voltage

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The patent applies parameter changes by systematically optimizing the energy levels (HOMO/LUMO), mobility values, and T1 values of organic materials in different layers. By adjusting these parameters to achieve optimal energy balance across the organic material layer, the invention reduces Joule heating and material deterioration, thereby extending element lifetime while maintaining acceptable driving voltage levels

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent employs composite materials by using multiple organic material layers with different functions (hole injection layer, hole transport layer, light emitting layer, electron transport layer, electron injection layer), each composed of materials with specifically selected properties. This multi-layer composite structure enables optimal energy balance and charge transport, improving both reliability and energy efficiency

Inventive Principle:

Principle #40Composite materials

2Productivity

If efficiency is increased to reduce power consumption, then driving voltage is lowered and lifetime increases, but achieving high efficiency requires optimal material combination which is complex

Engineering Contradiction:

Improveluminous efficiencyVSAvoidmaterial layer optimization

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent systematically changes material parameters including HOMO/LUMO energy levels, mobility values, and T1 values to achieve optimal energy balance. By establishing specific parameter ranges and relationships between layers, the invention achieves high luminous efficiency while providing a methodological framework that reduces the complexity of material selection

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent introduces the concept of energy balance as an intermediary principle that mediates between different material layers. By ensuring optimal energy balance across the organic material layer, the invention achieves high efficiency without requiring complex trial-and-error optimization of each individual layer

Inventive Principle:

Principle #24Intermediary (Mediator)

3Area of stationary object

If display size increases in portable displays, then more functionality is provided, but power consumption increases which limits battery life

Engineering Contradiction:

Improvedisplay sizeVSAvoidpower consumption

Core Design Contradiction:

Area of stationary objectVSUse of energy by moving object

Solution Approach 1:

The patent optimizes the energy parameters of organic materials to achieve lower driving voltages and higher luminous efficiency. This enables larger display areas to be powered by limited battery capacity, as the improved energy efficiency compensates for the increased power demand of larger displays

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 enhances the luminous efficiency and lifetime of the organic electroluminescent element by reducing driving voltage and improving energy balance across layers, leading to better performance in electronic devices.

Implementation Method 1

an organic light emitting phenomenon refers to a phenomenon in which electric energy is converted into light energy of an organic material

Methodology Applied

Scientific EffectElectroluminescence: Electroluminescence

Implementation Method 2

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

Methodology Applied

Scientific EffectEnergy transfer:

Data Source

PatentUS11557732B2Organic electroluminescent compound, and organic electroluminescent element and device employing the same

Publication Date: 2023.01.17 DUK SAN NEOLUX

AI summary

Provided are a compound represented by Formula 1, an organic electroluminescent element comprising a first electrode, a second electrode, and an organic material layer formed between the first electrode and the second electrode, and electroluminescent device thereof, and by comprising the compound represented by Formula 1 in the organic material layer, the driving voltage of the organic electroluminescent element can be lowered, and the luminous efficiency and life time of the organic electroluminescent element can be improved.