Organic EL Compound Structure for Extended Device Lifetime

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Solution Overview

Problem

Conventional organic electroluminescence devices have insufficient performance, particularly in terms of lifetime, necessitating the development of materials that enhance efficiency and longevity.

Innovation Solution

A specific compound with a defined structure is used for the emitting layer of organic electroluminescence devices, characterized by various substituents and functional groups, which improves device efficiency and extends its lifespan.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional materials are used for the emitting layer, then the device structure is simple, but the device lifetime is insufficient

Engineering Contradiction:

Improvedevice lifetimeVSAvoidmaterial structure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent modifies the molecular structure parameters of the emitting layer material by introducing specific substituent groups (R1-R10) with defined chemical properties. This changes the material's physical and chemical parameters to achieve longer device lifetime while maintaining reasonable structural complexity through systematic variation of known chemical groups.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent employs composite material design by combining the core emitting structure with various substituent groups (alkyl, aryl, heterocyclic groups, and functional groups). This composite approach allows optimization of device lifetime through the synergistic effects of different chemical components while managing overall material complexity.

Inventive Principle:

Principle #40Composite materials

2Productivity

If conventional emitting layer materials are used, then the manufacturing process is simple, but the luminous efficiency is insufficient

Engineering Contradiction:

Improveluminous efficiencyVSAvoidcompound structure

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent applies local quality modification by introducing specific functional groups and substituent patterns at particular positions (R1-R10) of the emitting layer molecule. This localized optimization of chemical structure enhances luminous efficiency through improved charge transport and exciton management at critical molecular sites without requiring complete structural redesign.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent optimizes luminous efficiency by adjusting molecular parameters such as HOMO/LUMO energy levels, molecular weight, and substituent patterns. These parameter changes improve charge injection, transport, and recombination characteristics to enhance luminous efficiency while maintaining manufacturability through conventional organic EL fabrication processes.

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 use of this compound results in organic electroluminescence devices with high luminous efficiency and extended lifetime, addressing the limitations of existing technologies.

Implementation Method 1

When voltage is applied to an organic electroluminescence device (hereinafter, frequently referred to as an organic EL device), holes and electrons are injected into an emitting layer from an anode and a cathode, respectively.

Methodology Applied

Scientific EffectElectrical conduction: Conduction (electrical)