Deuterated Electron-Transport Material for Longer OLED Lifetime

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Solution Overview

Problem

Conventional organic electroluminescence devices have not achieved sufficient performance enhancement despite improvements in materials, necessitating a more effective compound for the electron-transporting region.

Innovation Solution

A compound with a specific structure, represented by formula (1), is used in the electron-transporting region of the organic electroluminescence device, incorporating deuterium atoms and specific substituents to enhance device performance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional materials are used for the electron-transporting region, then the device structure is simple, but the device performance and lifetime are insufficient

Engineering Contradiction:

Improvedevice lifetimeVSAvoidcompound structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent applies parameter changes by introducing deuterium atoms to replace hydrogen atoms in the compound structure. This isotopic substitution modifies the physical and chemical parameters of the electron-transporting material, resulting in improved device lifetime and performance without fundamentally changing the device architecture

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent employs composite material design by combining the anthracene core structure with benzimidazole groups and various substituents (formula 1 structure). This creates a composite molecular structure that integrates multiple functional components to achieve superior electron transport properties and enhanced device reliability

Inventive Principle:

Principle #40Composite materials

2Reliability

If materials are gradually improved to enhance device performance, then device performance increases, but further performance enhancement becomes difficult

Engineering Contradiction:

Improvedevice performanceVSAvoidmaterial improvement difficulty

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent achieves further performance enhancement by changing the isotopic parameter (hydrogen to deuterium substitution) and molecular structure parameters (substituents R1-R10), overcoming the plateau in conventional material improvement and enabling continued performance gains

Inventive Principle:

Principle #35Parameter changes

3Duration of action of stationary object

If a compound with specific structure and deuterium atoms is used, then device lifetime is prolonged, but the compound structure becomes more complex

Engineering Contradiction:

Improvedevice lifetimeVSAvoidcompound structure

Core Design Contradiction:

Duration of action of stationary objectVSDevice complexity

Solution Approach 1:

The patent uses parameter changes (deuterium substitution) to prolong device lifetime while maintaining a systematic and organized molecular structure through defined substitution patterns on the anthracene core, balancing complexity with performance enhancement

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS20230309380A1Compound, material for organic electroluminescence device, organic electroluminescence device, and electronic apparatus

Publication Date: 2023.09.28 IDEMITSU KOSAN CO LTD

AI summary

A compound represented by the following formula (1).