OLED Compound Energy-Level Tuning for Efficiency and Lifespan

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Solution Overview

Problem

Existing organic electroluminescent devices face challenges with efficiency, lifespan, and color purity due to charge imbalance and material instability, particularly in the hole transport layer, which is exacerbated by Joule heating and metal oxide penetration.

Innovation Solution

A novel compound represented by Formula 1 is introduced, which improves luminous efficiency, stability, and lifespan by optimizing the energy levels and intrinsic properties of the organic material layers, including a high T1 value and HOMO level in the emitting-auxiliary layer, and enhances heat resistance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Use of energy by moving object

If the efficiency of organic electronic element is increased, then the driving voltage is decreased, but the lifespan is shortened due to crystallization of organic materials from Joule heating

Engineering Contradiction:

ImproveefficiencyVSAvoidlifespan

Core Design Contradiction:

Use of energy by moving objectVSDuration of action of stationary object

Solution Approach 1:

The patent changes the energy level parameters of the organic materials, specifically selecting materials with appropriate HOMO levels and T1 values to optimize the balance between efficiency and lifespan. The compound formula (1) represents a specific molecular structure designed with optimized energy levels to prevent crystallization while maintaining high efficiency.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent uses a multi-layered composite structure with different organic material layers (hole injection layer, hole transport layer, emitting layer, electron transport layer, electron injection layer) where each layer is composed of materials with specifically optimized energy levels to work together synergistically, resolving the contradiction between efficiency and lifespan.

Inventive Principle:

Principle #40Composite materials

2Power

If the HOMO value of hole transport layer material is low, then the T1 value is low, but exciton transfer to hole transport layer causes charge unbalance and reduces color purity and efficiency

Engineering Contradiction:

ImproveT1 valueVSAvoidefficiency

Core Design Contradiction:

PowerVSUse of energy by moving object

Solution Approach 1:

The patent optimizes the HOMO level parameter of the hole transport layer material to be higher than conventional materials, which consequently increases the T1 value. This parameter optimization prevents exciton transfer to the hole transport layer, eliminating charge unbalance and improving both color purity and efficiency.

Inventive Principle:

Principle #35Parameter changes

3Temperature

If the glass transition temperature of hole transport layer material is low, then the uniformity of thin film surface is lowered during driving, but the lifespan is significantly reduced

Engineering Contradiction:

Improveglass transition temperatureVSAvoidlifespan

Core Design Contradiction:

TemperatureVSDuration of action of stationary object

Solution Approach 1:

The patent increases the glass transition temperature parameter of the hole transport layer material to maintain uniform thin film surface characteristics during device operation. This prevents surface degradation and extends the device lifespan while maintaining operational stability.

Inventive Principle:

Principle #35Parameter changes

4Reliability

If different emitting-auxiliary layers are developed for each emitting layer (R, G, B), then the emission problem is solved, but the device complexity increases

Engineering Contradiction:

Improveemission performanceVSAvoidnumber of emitting-auxiliary layers

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent develops a universal emitting-auxiliary layer composition that can be used with different emitting layers (R, G, B) by adjusting the host material and dopant. This single versatile composition solves the emission problems for all color layers, reducing device complexity while maintaining reliable emission performance across all colors.

Inventive Principle:

Principle #6Universality (Multi-functionality)

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 voltage, improved color purity, and extended lifespan by stabilizing the organic electronic element against Joule heating and metal oxide penetration.

Implementation Method 1

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

Methodology Applied

Scientific EffectOrganic light emitting phenomenon: Electroluminescence

Implementation Method 2

electrons are transferred from the electron transport layer to the emitting layer, and holes are transferred from the hole transport layer to the emitting layer to generate excitons by recombination

Methodology Applied

Scientific EffectRecombination:

Implementation Method 3

crystallization of organic materials due to Joule heating generated during driving decreases

Methodology Applied

Scientific EffectJoule heating: Joule Heating

Data Source

PatentUS12490651B2Compound for organic electronic element, organic electronic element using the same, and an electronic device thereof

Publication Date: 2025.12.02 DUK SAN NEOLUX

AI summary

Provided are a compound of Formula 1 that can improve the luminous efficiency, stability, and lifespan of an organic electronic element using the same, the organic electronic element and an electronic device thereof.