OLED Host Material Composite for Voltage and Efficiency

Solution Overview

Problem

There is a need for organic light emitting devices (OLEDs) that exhibit low driving voltage, high emission efficiency, and excellent lifespan.

Innovation Solution

The use of a specific combination of a first compound and a second compound as host materials in the light emitting layer of OLEDs, where the first compound is an N-type host material and the second compound is a P-type host material, enhancing the stability and balance of electrons and holes.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If a single material host is used in the light emitting layer, then the device structure is simple, but the driving voltage is high and emission efficiency is low

Engineering Contradiction:

Improvehost material structureVSAvoiddriving voltage

Core Design Contradiction:

Device complexityVSPower

Solution Approach 1:

The patent uses a composite host material system comprising both N-type host compound and P-type host compound in the light emitting layer. This composite material approach enables simultaneous achievement of low driving voltage and high emission efficiency by leveraging the complementary electronic properties of the two host types, while maintaining reasonable device structure complexity.

Inventive Principle:

Principle #40Composite materials

2Device complexity

If a single material host is used in the light emitting layer, then the device structure is simple, but the emission efficiency is low

Engineering Contradiction:

Improvehost material structureVSAvoidemission efficiency

Core Design Contradiction:

Device complexityVSProductivity

Solution Approach 1:

The patent employs a composite host material system comprising both N-type host compound and P-type host compound in the light emitting layer. This composite material approach enables simultaneous achievement of low driving voltage and high emission efficiency by leveraging the complementary electronic properties of the two host types, while maintaining reasonable device structure complexity.

Inventive Principle:

Principle #40Composite materials

3Ease of manufacture

If conventional host materials are used, then the device is easy to manufacture, but the lifespan is short

Engineering Contradiction:

Improvedevice fabricationVSAvoiddevice lifespan

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The patent modifies the chemical composition parameters of the host materials by selecting specific N-type and P-type compounds with optimized molecular structures. This parameter optimization enhances device lifespan through improved charge balance and reduced degradation mechanisms, while maintaining compatibility with conventional OLED fabrication processes.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent employs a composite host material system comprising both N-type host compound and P-type host compound in the light emitting layer. This composite material approach enables simultaneous achievement of low driving voltage and high emission efficiency by leveraging the complementary electronic properties of the two host types, while maintaining reasonable device structure complexity.

Inventive Principle:

Principle #40Composite materials

4Ease of manufacture

If conventional host materials are used, then the device is easy to manufacture, but the emission efficiency is low

Engineering Contradiction:

Improvedevice fabricationVSAvoidemission efficiency

Core Design Contradiction:

Ease of manufactureVSProductivity

Solution Approach 1:

The patent modifies the chemical composition parameters of the host materials by selecting specific N-type and P-type compounds with optimized molecular structures. This parameter optimization enhances device lifespan through improved charge balance and reduced degradation mechanisms, while maintaining compatibility with conventional OLED fabrication processes.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent employs a composite host material system comprising both N-type host compound and P-type host compound in the light emitting layer. This composite material approach enables simultaneous achievement of low driving voltage and high emission efficiency by leveraging the complementary electronic properties of the two host types, while maintaining reasonable device structure complexity.

Inventive Principle:

Principle #40Composite materials

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

This configuration results in OLEDs with low driving voltage, high emission efficiency, and extended lifespan compared to devices using single material hosts.

Implementation Method 1

an organic light emitting phenomenon refers to a phenomenon where electric energy is converted into light energy by using an organic material

Methodology Applied

Scientific EffectElectroluminescence: Electroluminescence

Data Source

PatentUS12324353B2Organic light emitting device

Publication Date: 2025.06.03 LG CHEM LTD

AI summary

An organic light emitting device comprising a first electrode, a second electrode provided to face the first electrode, and a light emitting layer provided between the first electrode and the second electrode and including a first compound represented by Chemical Formula 1 and a second compound represented by Chemical Formula 2, the organic light emitting device which exhibits low driving voltage, high emission efficiency, and long lifespan characteristics.