Emitting Layer Compound for Longer-Life Organic Electroluminescence

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Solution Overview

Problem

Existing organic electroluminescence devices face challenges in achieving a long device lifetime due to the limitations of materials used in the emitting layer.

Innovation Solution

A novel compound represented by a specific formula is introduced, which can be used in the emitting layer of organic electroluminescence devices, allowing for improved recombination of holes and electrons, thereby enhancing device longevity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Duration of action of stationary object

If conventional materials are used in the emitting layer, then device fabrication is straightforward, but device lifetime is limited

Engineering Contradiction:

Improvedevice lifetimeVSAvoidmaterial selection flexibility

Core Design Contradiction:

Duration of action of stationary objectVSAdaptability or versatility

Solution Approach 1:

The patent modifies the molecular structure of emitting layer materials by introducing specific substituent groups (R1-R8) at defined positions on the core aromatic structure. This systematic parameter change in molecular composition enables extended device lifetime while maintaining processability and device performance.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The invention employs composite molecular structures combining a core aromatic framework with various substituent groups (alkyl, aryl, heterocyclic, etc.). This composite approach allows optimization of both stability for long lifetime and compatibility with existing fabrication processes.

Inventive Principle:

Principle #40Composite materials

2Power

If existing emitting layer materials are used, then device structure is simple, but recombination efficiency of holes and electrons is insufficient

Engineering Contradiction:

Improverecombination efficiencyVSAvoidmaterial structure complexity

Core Design Contradiction:

PowerVSDevice complexity

Solution Approach 1:

The patent introduces specific substituent groups at strategic positions (R1-R8) on the molecular framework to locally enhance charge carrier recombination properties. This localized modification improves hole-electron recombination efficiency without requiring complete redesign of the entire device structure.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The emitting layer material is segmented into a core structure and multiple substituent positions, allowing independent optimization of recombination efficiency through selective substitution while maintaining overall structural integrity and device simplicity.

Inventive Principle:

Principle #1Segmentation

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 novel compound leads to an organic electroluminescence device with extended lifetime and improved performance.

Implementation Method 1

When voltage is applied to an organic electroluminescence device, holes and electrons are injected into an emitting layer from an anode and a cathode, respectively. Then, thus injected holes and electrons are recombined in the emitting layer, and excitons are formed therein.

Methodology Applied

Scientific EffectElectroluminescence: Electroluminescence

Data Source

PatentUS12516240B2Compound, organic electroluminescence device using the same, and electronic apparatus

Publication Date: 2026.01.06 IDEMITSU KOSAN CO LTD

AI summary

A compound represented by the following formula (1), wherein in the formula, L1 and L2 are predetermined linking groups, and Ar1 is a monovalent group having a structure represented by the following formula (2).