Interlocked Compound Organic Electroluminescence Device

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Solution Overview

Problem

Organic electroluminescence devices face challenges with low light emission efficiency and durability due to the use of metal complexes with strong intermolecular interactions, leading to low solubility and impure light emission, especially when using wet coating methods.

Innovation Solution

Incorporating an interlocked compound, such as catenane or rotaxane, in the organic electroluminescence device, particularly in the hole injection or light emission layers, which allows for a wet coating process and improves solubility and light emission efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Use of energy by moving object

If metal complexes with strong intermolecular interactions are used, then light emission efficiency is improved, but solubility decreases and manufacturing difficulty increases

Engineering Contradiction:
Improvelight emission efficiencyVSAvoidsolubility
Core Design Contradiction:
Use of energy by moving objectVSEase of manufacture

Solution Approach 1:

The patent introduces a wet coating method using solvent-based solutions as an intermediary approach to deposit metal complexes. The solvent acts as a mediator that enables the metal complexes to be applied in solution form, avoiding the need for direct vacuum deposition while maintaining the benefits of metal complex light emission efficiency.

Inventive Principle:
Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent changes the physical state and concentration parameters of the metal complexes by dissolving them in solvents at controlled concentrations. This allows the material to transition from an insoluble solid state to a soluble solution state, enabling wet coating processing while maintaining the active metal complex properties for light emission.

Inventive Principle:
Principle #35Parameter changes

2Illumination intensity

If metal complexes are used at high concentration, then light emission intensity is improved, but molecular associate formation increases causing color purity degradation

Engineering Contradiction:
ImproveluminanceVSAvoidcolor purity
Core Design Contradiction:
Illumination intensityVSProductivity

Solution Approach 1:

The patent optimizes the concentration parameter of metal complexes in the solution, finding a balance that provides sufficient luminance while preventing excessive molecular associate formation. By controlling concentration within specific ranges and using appropriate solvents, the patent maintains color purity while achieving high light emission intensity.

Inventive Principle:
Principle #35Parameter changes

Solution Approach 2:

The patent uses molecular imprinting or template approaches where the desired molecular spacing is pre-established in the solution, preventing molecular associates from forming even at high concentrations. This allows high luminance to be achieved without the harmful effects of molecular aggregation.

Inventive Principle:
Principle #26Copying

3Ease of manufacture

If wet coating method is used for large area device production, then manufacturing ease is improved, but uniform dissolution of metal complexes becomes difficult

Engineering Contradiction:
Improvelarge area production capabilityVSAvoiddissolution uniformity
Core Design Contradiction:
Ease of manufactureVSManufacturing precision

Solution Approach 1:

The patent optimizes multiple parameters including solvent type, metal complex concentration, and solution composition to achieve uniform dissolution. By carefully selecting solvents with appropriate polarity and adding co-solvents or surfactants, the patent ensures homogeneous distribution of metal complexes across large areas during wet coating.

Inventive Principle:
Principle #35Parameter changes

Solution Approach 2:

The patent introduces auxiliary substances such as surfactants, co-solvents, or dispersing agents as intermediaries that facilitate uniform dissolution and distribution of metal complexes in the coating solution. These intermediaries prevent aggregation and ensure homogeneous film formation during wet coating processes.

Inventive Principle:
Principle #24Intermediary (Mediator)

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 interlocked compounds enhances light emission efficiency and driving durability, enabling high luminance and stable performance even at high concentrations, while maintaining pure light emission colors.

Implementation Method 1

an organic electroluminescence device comprising at least an organic layer between a pair of electrodes

Methodology Applied
Scientific EffectElectroluminescence: Electroluminescence

Data Source

PatentUS7960040B2Organic electroluminescence device
Publication Date: 2011.06.14 UDC IRELAND
  • US7960040B2 patent drawing
  • US7960040B2 patent drawing
  • US7960040B2 patent drawing

AI summary

An organic electroluminescence device comprising at least an organic layer between a pair of electrodes, wherein the organic electroluminescence device further includes at least an interlocked compound. An organic electroluminescence device exhibiting a high light emission efficiency and excellent driving durability is provided.