OLED Semiconductor Layer Composition for Lower Voltage Emission

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Solution Overview

Problem

Existing organic light-emitting diodes (OLEDs) face challenges in achieving balanced hole and electron injection, leading to high operating voltages and reduced efficiency, which affects power consumption and battery life, particularly in mobile devices.

Innovation Solution

Incorporating a compound of Formula (1) in the organic semiconductor layer, which includes specific aryl and heteroaryl substituents, and optionally a redox n-dopant, to enhance electron transport and injection properties, thereby reducing operating voltage and improving efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Use of energy by moving object

If conventional organic semiconductor materials are used in OLEDs, then the device structure can be maintained, but the operating voltage remains high and efficiency is reduced

Engineering Contradiction:

Improveoperating voltageVSAvoiddevice efficiency

Core Design Contradiction:

Use of energy by moving objectVSProductivity

Solution Approach 1:

The patent modifies the chemical structure of organic semiconductor materials by introducing specific molecular configurations and functional groups, which changes the electrical parameters (electron mobility, HOMO/LUMO levels) to achieve lower operating voltage and higher efficiency simultaneously

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The invention uses composite organic semiconductor materials combining different molecular components with complementary properties, where one component provides electron transport while another facilitates hole transport, achieving balanced charge injection and improved overall device efficiency

Inventive Principle:

Principle #40Composite materials

2Ease of manufacture

If the organic semiconductor layer uses standard materials, then manufacturing is straightforward, but electron transport and injection properties are insufficient

Engineering Contradiction:

Improvematerial depositionVSAvoidelectron transport property

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The patent optimizes the molecular weight, glass transition temperature, and solubility parameters of the organic semiconductor materials to maintain ease of deposition while significantly improving electron transport properties through enhanced molecular packing and crystallinity

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 solution results in OLEDs with lower operating voltages and increased efficiency, contributing to reduced power consumption and extended battery life.

Implementation Method 1

organic electroluminescent material

Methodology Applied

Scientific EffectElectroluminescence: Electroluminescence

Data Source

PatentEP4066297B1Organic electronic device and display device comprising the organic electronic device as well as organic compounds for use in organic electronic devices

Publication Date: 2025.12.24 NOVALED GMBH

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AI summary

The present invention relates to an organic electronic device comprising a semiconductor layer which comprises a compound of formula (1)