Charge Transport Film via Ionic Compound Solubility
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current organic electroluminescent elements face challenges in achieving high light emission efficiency and long service life, particularly in polymer type organic EL elements, due to difficulties in forming stable multilayer structures using wet processes, and existing electron accepting compounds have low solubility and stability issues.
Innovation Solution
Incorporating charge transporting compounds with ionic compounds, specifically those containing halogen atoms and perfluoroalkyl groups, as polymerization initiators to enhance solubility and stability, allowing for the formation of stable thin films and multilayer structures, thereby improving the productivity and performance of organic electronic elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional electron accepting compounds are used in polymer type organic EL elements, then light emission efficiency can be improved, but solubility and stability deteriorate
Solution Approach 1:
The patent modifies the chemical structure of electron accepting compounds by introducing ionic groups (such as carboxylate, sulfonate, or phosphate groups) to change their solubility parameters and thermal stability characteristics while maintaining their electron accepting capability. This allows the compounds to be processed in wet film formation methods without sacrificing their function in improving light emission efficiency.
Solution Approach 2:
The patent creates composite materials by combining conventional electron accepting compounds with polymer matrices or surfactants that provide solubility and stability. This composite approach allows the electron accepting compound to maintain its high efficiency function while the polymer or surfactant component provides the necessary solubility for wet processing and thermal stability for multilayer formation.
2Device complexity
If wet film formation method is used in polymer type organic EL elements, then manufacturing complexity is reduced, but multilayer structure formation deteriorates
Solution Approach 1:
The patent applies preliminary thermal treatment or cross-linking to the first deposited layer before forming subsequent layers. This preliminary action modifies the surface properties of the first layer to prevent dissolution by the solvent in the second layer, enabling successful multilayer formation while maintaining the simplicity of wet film formation methods.
Solution Approach 2:
The patent introduces intermediate barrier layers or protective coatings between functional layers to prevent mutual dissolution. These cushioning layers are designed to be insoluble in the solvents used for subsequent layers, thereby protecting the underlying layers while allowing the wet film formation process to continue.
3Loss of energy
If multilayer structure is formed in polymer type organic EL elements, then light emission efficiency is improved, but manufacturing difficulty increases
Solution Approach 1:
The patent divides the organic EL structure into functionally distinct layers with optimized thicknesses and material compositions. By segmenting the device into specialized layers (hole injection layer, electron injection layer, transport layers, emission layer), each layer can be independently optimized for its function while using simplified wet-based fabrication processes for each layer.
Solution Approach 2:
The patent develops universal wet-based fabrication processes and material systems that can be applied across all layers of the multilayer structure. This universality allows the same basic deposition and processing techniques to be used for multiple layers, reducing the cumulative manufacturing difficulty despite the increased structural complexity.
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 ionic compounds with charge transporting materials enables the formation of organic thin films with improved solubility and stability, leading to lower driving voltage and longer light emission lifetimes for organic electroluminescent elements.
Implementation Method 1
Incorporating charge transporting compounds with ionic compounds, specifically those containing halogen atoms and perfluoroalkyl groups, as polymerization initiators to enhance solubility and stability
Data Source
AI summary
Disclosed is an organic electronic material comprising charge transporting compounds and ionic compounds having electron-accepting properties and high solubility in a solvent. The organic electronic material is characterized by comprising charge transporting compounds and ionic compounds, and in that at least one of the ionic compounds is any one kind of compounds represented by general formulas (1b)-(3b). (In the formulas Y1-Y6 each independently represent a divalent linking group, R1-R6 each independently represent an electron-attracting organic substituent (these structures can further have substituents and hetero-atoms, and R1, R2 and R3, or, R4-R6 can respectively combine and become a ring shape or a polymer shape) and L+ represents a monovalent cation.)