Deuterium-Substituted OLED Compounds for Efficiency and Lifetime

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Solution Overview

Problem

Existing organic light emitting diodes (OLEDs) face challenges with low luminous efficiency and short luminous lifetime, particularly due to the use of fluorescent materials and metal complexes with insufficient durability against external stress like heat.

Innovation Solution

Introduce deuterium substitution in specific moieties of the organic compound within the emitting material layer, enhancing luminous efficiency and lifetime without replacing all protium atoms with deuterium, thereby optimizing the use of expensive deuterium and reducing manufacturing costs.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If fluorescent material is used in OLED, then device structure is simple, but luminous efficiency is low

Engineering Contradiction:

Improvedevice structureVSAvoidluminous efficiency

Core Design Contradiction:

Device complexityVSLoss of energy

Solution Approach 1:

The patent changes the chemical composition parameter by introducing deuterium substitution in specific moieties of the organic compound. This parameter change enhances luminous efficiency without requiring complex device structures, resolving the contradiction between simplicity and efficiency.

Inventive Principle:

Principle #35Parameter changes

2Loss of energy

If metal complex phosphorescent material is used, then luminous efficiency is high, but luminous lifetime is short

Engineering Contradiction:

Improveluminous efficiencyVSAvoidluminous lifetime

Core Design Contradiction:

Loss of energyVSDuration of action of stationary object

Solution Approach 1:

The patent applies parameter changes by substituting deuterium for protium in specific positions of the organic compound molecules. This chemical parameter modification extends luminous lifetime while maintaining high luminous efficiency, addressing the contradiction between efficiency and durability.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite approach by combining deuterated organic compounds with appropriate host materials in the emitting layer. This composite material strategy achieves both high efficiency and extended lifetime, resolving the contradiction between luminous efficiency and luminous lifetime.

Inventive Principle:

Principle #40Composite materials

3Reliability

If all protium atoms are substituted with deuterium, then luminous efficiency and lifetime are improved, but manufacturing cost increases

Engineering Contradiction:

Improveluminous lifetimeVSAvoidmanufacturing cost

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent applies local quality by substituting deuterium only in specific moieties of the organic compound rather than all protium atoms. This selective substitution maintains the beneficial effects on luminous lifetime and efficiency while significantly reducing material costs, resolving the contradiction between reliability and manufacturing cost.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent uses partial action by introducing deuterium substitution only in specific positions where it provides maximum benefit. This partial deuterium substitution achieves the desired performance improvement without the excessive cost of complete substitution, balancing reliability and manufacturing cost.

Inventive Principle:

Principle #16Partial or excessive action

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 OLEDs exhibit improved luminous efficiency and extended lifetime, offering economic benefits and enhanced durability against external stress such as heat.

Implementation Method 1

at least one protium linked to a specific position in the organic compound, which is introduced to the emitting material layer, is substituted with deuterium

Methodology Applied

Scientific EffectDeuterium substitution:

Implementation Method 2

The deuterium has excellent resistance against external stress such as heat. In particular, the organic light emitting diode including an organic compound in which deuterium is substituted for the specific moiety where thermal decomposition can easily occur can improve its luminous efficiency and luminous life time

Methodology Applied

Scientific EffectVibrational energy loss reduction:

Data Source

PatentEP4038667B1Organic light emitting diode and organic light emitting device having the same

Publication Date: 2025.09.10 LG DISPLAY CO LTD

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AI summary

The present disclosure relates to an organic light emitting diode that comprises an organic compound in which a carbazole moiety fused with an aromatic ring and a hetero aromatic ring is linked to a triazine moiety substituted with aromatic and/or hetero aromatic groups via an aromatic linker, and at least one protium constituting the aromatic and/or hetero aromatic groups of the triazine moiety and the aromatic linker moiety is substituted with deuterium, and an organic light emitting device including the diode. The molecular conformation of the deuterium-substituted triazine moiety and the aromatic linker moiety is not deteriorated and dissolved, and therefore, the organic compound can implement luminous efficiency and luminous lifetime as an organic compound in which whole protiums are substituted with deuteriums.