Deuterium-Substituted Organic Compound for OLED Efficiency

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Solution Overview

Problem

Current organic electro-luminescence elements face challenges in increasing efficiency, reducing driving voltage, extending lifespan, improving stability, and enhancing manufacturing efficiency, particularly in achieving high hole mobility and heat resistance while preventing metal oxide penetration and Joule heating.

Innovation Solution

A compound substituted with heavy hydrogen is developed, which forms a hole injection/hole transport layer material with improved thermodynamic behavior, reducing crystallinity and intermolecular interactions, and is used in an organic electronic element to enhance luminous efficiency and heat resistance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If conventional organic material layers are used in organic electro-luminescence elements, then the device structure is simple and manufacturing is easy, but the luminous efficiency is low, driving voltage is high, and lifespan is short

Engineering Contradiction:

Improveluminous efficiencyVSAvoiddriving voltage

Core Design Contradiction:

ProductivityVSLoss of energy

Solution Approach 1:

The patent substitutes hydrogen atoms with deuterium (heavy hydrogen) in the organic compound molecules. This isotopic substitution changes the physical and chemical parameters of the material, including bond strength, vibrational frequency, and thermal stability, which collectively improve charge transport properties and reduce energy loss while maintaining structural integrity

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The invention creates a composite hole injection/transport layer by combining deuterium-substituted organic compounds with specific functional groups (such as triphenylamine derivatives). This composite material structure synergistically enhances hole mobility, reduces crystallinity, and improves overall device performance compared to conventional single-material layers

Inventive Principle:

Principle #40Composite materials

2Temperature

If conventional organic compounds are used, then manufacturing process is straightforward, but heat resistance is insufficient and Joule heating occurs

Engineering Contradiction:

Improveheat resistanceVSAvoidmanufacturing process complexity

Core Design Contradiction:

TemperatureVSEase of manufacture

Solution Approach 1:

Deuterium substitution increases the C-D bond strength compared to C-H bonds, raising the thermal decomposition temperature and glass transition temperature of the organic material. This parameter change enhances heat resistance and reduces Joule heating effects without complicating the vacuum deposition manufacturing process

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent uses deuterium-substituted organic compounds that can be deposited as thin films through conventional vacuum deposition techniques. The material's improved thermal stability allows it to withstand processing temperatures and operational heating without degradation, effectively 'resisting' thermal damage through material selection rather than complex cooling systems

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

3Reliability

If metal electrodes are used directly, then device structure is simple, but metal oxide penetrates into organic layers causing degradation

Engineering Contradiction:

Improvestability against metal oxide penetrationVSAvoidlayer structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The deuterium-substituted organic compound layer serves as an intermediary between the metal electrode and the rest of the organic device structure. This layer acts as a barrier that prevents metal oxide diffusion and penetration into sensitive organic layers, while still allowing efficient charge injection and transport. The deuterium substitution enhances this barrier property through increased thermal and chemical stability

Inventive Principle:

Principle #24Intermediary (Mediator)

4Productivity

If crystalline organic material layers are formed, then material structure is well-defined, but intermolecular interactions are strong causing reduced efficiency and increased crystallinity

Engineering Contradiction:

Improveluminous efficiencyVSAvoidcrystallinity

Core Design Contradiction:

ProductivityVSStability of the object's composition

Solution Approach 1:

Deuterium substitution alters the molecular vibrational modes and intermolecular interaction strengths. The heavier deuterium atoms reduce the strength of intermolecular forces compared to hydrogen, which suppresses crystallization tendency and promotes amorphous phase formation. This parameter change optimizes the balance between molecular order and disorder for enhanced charge transport and reduced energy loss

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent introduces deuterium substitution at specific positions within the organic molecule structure (such as on aromatic rings or alkyl chains). This localized isotopic modification creates regions with different intermolecular interaction characteristics, preventing uniform crystalline packing while maintaining local molecular order necessary for charge transport functionality

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS9691990B2Compound, organic electronic element using same, and electronic device using the latter

Publication Date: 2017.06.27 DUK SAN NEOLUX

AI summary

The present invention relates to a compound, which is represented by one chemical formula among the chemical formulas (1) to (3), an organic electronic element comprising the compound, and an electronic device comprising the organic electronic element. The compound is characterized by comprising at least one phenyl group having at least one substitution with deuterium or tritium.