OLED Light Emitting Layer Composite Material Voltage

Solution Overview

Problem

There is a continuous need for organic light emitting devices with improved driving voltage, efficiency, and lifetime, as existing devices face limitations in these areas.

Innovation Solution

The organic light emitting device incorporates a light emitting layer comprising specific compounds represented by Chemical Formulas 1 and 2, which enhance the driving voltage, efficiency, and lifetime by optimizing the materials used in the layer structure.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Use of energy by moving object

If conventional organic material layers are used in the light emitting device, then the device structure is simple, but the driving voltage is high and efficiency is low

Engineering Contradiction:

Improvedriving voltageVSAvoidmaterial layer structure

Core Design Contradiction:

Use of energy by moving objectVSDevice complexity

Solution Approach 1:

The patent employs composite material strategy by combining compound (1) with specific host materials (compounds of formulas 2-6) and dopant materials (compounds of formulas 7-12) in the light emitting layer. This composite approach creates synergistic effects that reduce driving voltage and improve efficiency while maintaining a manageable multilayer structure.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent applies parameter changes by carefully controlling the weight ratios of compounds (1) and (2) in the light emitting layer, where compound (1) is used at 1-50 wt% and compound (2) at 50-99 wt%. This optimization of material parameters achieves improved driving voltage and efficiency without excessive structural complexity.

Inventive Principle:

Principle #35Parameter changes

2Productivity

If conventional organic material layers are used in the light emitting device, then the device structure is simple, but the efficiency is low

Engineering Contradiction:

ImproveefficiencyVSAvoidmaterial layer structure

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent employs composite material strategy by combining compound (1) with specific host materials (compounds of formulas 2-6) and dopant materials (compounds of formulas 7-12) in the light emitting layer. This composite approach creates synergistic effects that reduce driving voltage and improve efficiency while maintaining a manageable multilayer structure.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent applies parameter changes by carefully controlling the weight ratios of compounds (1) and (2) in the light emitting layer, where compound (1) is used at 1-50 wt% and compound (2) at 50-99 wt%. This optimization of material parameters achieves improved driving voltage and efficiency without excessive structural complexity.

Inventive Principle:

Principle #35Parameter changes

3Duration of action of stationary object

If conventional organic material layers are used in the light emitting device, then the manufacturing process is simple, but the lifetime is short

Engineering Contradiction:

ImprovelifetimeVSAvoidmanufacturing process

Core Design Contradiction:

Duration of action of stationary objectVSEase of manufacture

Solution Approach 1:

The patent employs composite material strategy by combining compound (1) with specific host materials (compounds of formulas 2-6) and dopant materials (compounds of formulas 7-12) in the light emitting layer. This composite approach creates synergistic effects that reduce driving voltage and improve efficiency while maintaining a manageable multilayer structure.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent applies preliminary action by pre-optimizing the molecular structures of compounds (1) and (2) with specific functional groups and conjugated systems before device fabrication. This preliminary material design ensures improved lifetime performance while maintaining compatibility with conventional manufacturing processes.

Inventive Principle:

Principle #10Preliminary action

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 use of these compounds in the light emitting layer results in an organic light emitting device with improved driving voltage, efficiency, and extended lifetime, addressing the existing limitations of such devices.

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

PatentUS20220085300A1Organic light emitting device

Publication Date: 2022.03.17 LG CHEM LTD

AI summary

An organic light emitting device including a light emitting layer which comprises a compound represented by Chemical Formula 1 and a compound represented by Chemical Formula 2, and the organic light emitting device having improved driving voltage, efficiency and lifetime.