Deuterated Organic Electroluminescence Device Stability

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Solution Overview

Problem

Current organic electroluminescence devices face challenges in achieving high efficiency and durability due to material deterioration, despite advancements in using phosphorescent materials like iridium and platinum complexes.

Innovation Solution

Incorporating a compound represented by Formula (I) with deuterium atoms in the organic electroluminescence device's light-emitting layer, which enhances chemical stability and reduces deterioration, combined with platinum or iridium complex phosphorescent materials for improved performance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Use of energy by moving object

If phosphorescent materials like iridium and platinum complexes are used to improve luminescence efficiency, then luminance efficiency is improved, but material deterioration occurs and durability cannot be attained

Engineering Contradiction:

Improveluminescence efficiencyVSAvoiddurability

Core Design Contradiction:

Use of energy by moving objectVSReliability

Solution Approach 1:

The patent applies parameter changes by substituting hydrogen atoms with deuterium atoms in the organic compound structure. This isotopic substitution changes the physical and chemical parameters of the material, specifically improving chemical stability and reducing deterioration rates, thereby resolving the contradiction between maintaining high luminescence efficiency and achieving improved durability

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite light-emitting layer that combines deuterium-containing organic compounds with phosphorescent metal complexes (iridium or platinum complexes). This composite material approach allows the system to maintain the high luminescence efficiency provided by the phosphorescent materials while the deuterium-containing host material provides enhanced chemical stability and durability

Inventive Principle:

Principle #40Composite materials

2Reliability

If deuterium-containing organic compounds are used to improve chemical stability, then durability is improved, but the combined effect with phosphorescent metal complexes was previously unknown

Engineering Contradiction:

Improvechemical stabilityVSAvoidmaterial combination complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The deuterium-containing organic compound serves as an intermediary host material that facilitates the interaction between electrodes and phosphorescent metal complexes. This intermediary material provides a stable environment that protects the phosphorescent materials from deterioration while maintaining efficient energy transfer, thus improving chemical stability without excessive complexity

Inventive Principle:

Principle #24Intermediary (Mediator)

3Device complexity

If conventional organic compounds are used in the light emitting layer, then device structure is simple, but material decomposition occurs and durability is poor

Engineering Contradiction:

Improvestructure simplicityVSAvoiddurability

Core Design Contradiction:

Device complexityVSDuration of action of stationary object

Solution Approach 1:

The patent changes the fundamental parameter of the organic compound by substituting hydrogen with deuterium. This parameter change maintains the basic molecular structure and simplicity of conventional organic compounds while dramatically improving chemical stability and durability, allowing the device to maintain good durability without excessive structural complexity

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 deuterium-containing compounds in the organic electroluminescence device's light-emitting layer significantly improves chemical stability and efficiency, leading to enhanced durability and performance by minimizing material decomposition and maintaining high luminance at low voltage.

Implementation Method 1

Incorporating a compound represented by Formula (I) with deuterium atoms in the organic electroluminescence device's light-emitting layer, which enhances chemical stability and reduces deterioration

Methodology Applied

Scientific EffectIsotopic substitution (deuterium):

Implementation Method 2

the light emitting layer contains a phosphorescent material... at least one of a platinum complex phosphorescent material and an iridium complex phosphorescent material

Methodology Applied

Scientific EffectPhosphorescence: Phosphorescence

Implementation Method 3

an organic electroluminescence device capable of converting electric energy to light and thereby emitting light

Methodology Applied

Scientific EffectElectroluminescence: Electroluminescence

Data Source

PatentEP2031037B1Organic electroluminescence device

Publication Date: 2015.12.09 UDC IRELAND

AI summary

An organic electroluminescent device includes a pair of electrodes; and an organic layer between the pair of electrodes, which includes a light-emitting layer and contains a compound represented by the following formula (1): wherein each of R1 to R7 independently represents a hydrogen atom or a substituent with the proviso that at least one of R1 to R7 represents a deuterium atom or a substituent containing a deuterium atom.