Hole Injection Layer Ink With Reversible Networks
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for forming a hole injection layer in organic light-emitting devices face issues with residue formation on electrodes, which affect luminescence efficiency and lifespan due to insufficient wettability of the hole injection layer composition during the inkjet process.
Innovation Solution
A hole injection layer ink composition is developed, comprising a hole injection layer compound, solvent, and a polymer compound with specific groups, forming a reversible network structure to enhance wettability, and includes a descumming process to remove residues using plasma treatment with gases like O2 and fluorine-containing gases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional hole injection layer composition is used during inkjet process, then the formation process is simple, but wettability is insufficient causing residue formation on electrode
Solution Approach 1:
The patent modifies the chemical composition parameters of the hole injection layer ink by incorporating specific polymer compounds (polyurethane, polyamide, polyurea) with defined molecular weight ranges and functional groups. These parameter changes improve wettability on the electrode surface while preventing residue formation during the inkjet process.
Solution Approach 2:
The invention uses composite material composition by combining hole injection layer compounds with specific polymer compounds (polyurethane, polyamide, or polyurea) in defined weight ratios. This composite approach enhances both wettability and residue prevention properties that single materials cannot achieve alone.
2Reliability
If descumming process is added to remove residues, then luminescence efficiency is improved, but process complexity increases
Solution Approach 1:
The patent applies preliminary action by performing descumming treatment before forming the hole injection layer. This preliminary removal of organic residues from the electrode surface ensures optimal wettability and prevents defects, improving luminescence efficiency while maintaining a manageable process sequence.
Solution Approach 2:
The hole injection layer ink composition acts as an intermediary that bridges the electrode surface and the subsequent organic emission layer. The optimized composition with specific polymer compounds ensures proper adhesion and function, compensating for the added descumming step and maintaining overall process efficiency.
3Reliability
If polymer compound with specific groups is added to enhance wettability, then residue formation is reduced, but manufacturing complexity increases
Solution Approach 1:
The patent specifies precise parameter ranges for polymer compounds (molecular weight Mn: 100-100,000 g/mol, Mw: 1,500-1,000,000 g/mol; weight content: 0.05-1 wt%) to achieve optimal wettability. These controlled parameter changes balance performance improvement with manufacturing feasibility, avoiding excessive complexity.
Solution Approach 2:
The invention applies local quality by specifically targeting the interface between the hole injection layer and electrode with tailored polymer compounds. The specific functional groups and molecular weight ranges are designed to locally enhance wettability at the critical electrode interface without requiring complex modifications throughout the entire material system.
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 solution improves the wettability of the hole injection layer composition, reducing residue formation and enhancing the luminescence efficiency and lifespan of the light-emitting devices by optimizing the inkjet process.
Implementation Method 1
a polymer compound and a solvent may form a reversible network structure by hydrogen bonding
Implementation Method 2
the descumming may include plasma treatment
Implementation Method 3
plasma treatment with gases like O2 and fluorine-containing gases
Data Source
AI summary
A method of forming a hole injection layer, a hole injection layer ink composition, and a light-emitting device manufactured by using the hole injection layer ink composition.