Inorganic Ester Solvent Printing Formulation for OLED Inkjet
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Solution Overview
Problem
Current printing technologies for OLEDs and QLEDs face challenges with low materials utilization rates, high costs, and reduced optoelectronic performance due to the use of vacuum processes and polymer additives that affect charge transport capacity.
Innovation Solution
A printing formulation comprising an inorganic ester solvent with specific viscosity and surface tension ranges, combined with functional materials like quantum dots, to form high-quality films suitable for inkjet printing, allowing for uniform film formation and effective solvent removal through post-treatment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If vacuum evaporation process is used for OLED preparation, then film formation is achieved, but materials utilization rate decreases and cost increases
Solution Approach 1:
The patent replaces the vacuum evaporation process (mechanical/physical system) with an inkjet printing process. The inkjet printing system uses a printing head with nozzles to deposit functional material ink directly onto the substrate, eliminating the need for vacuum equipment and fine metal masks, thereby improving materials utilization rate while maintaining manufacturing capability
Solution Approach 2:
The patent develops specific ink formulations with controlled viscosity (10-100 cP) and surface tension (20-50 mN/m) parameters to enable inkjet printing of functional materials. By optimizing these physical parameters, the patent makes the functional materials suitable for printing processes, achieving both cost reduction and improved materials utilization
2Stability of the object's composition
If polymer additives are used in quantum dot ink, then ink stability is improved, but charge transport capacity decreases
Solution Approach 1:
The patent removes polymer additives from the quantum dot ink formulation. Instead of using polymers to stabilize the ink, the patent relies on the natural stability of quantum dots in solution and optimizes other ink parameters (viscosity, surface tension) to achieve both stability and good charge transport capacity in the resulting film
Solution Approach 2:
The patent develops a composite ink formulation consisting of quantum dots dispersed in a carefully selected solvent system with specific physical properties. This composite approach without polymer additives maintains ink stability while preserving the charge transport capabilities of the quantum dot film
3Productivity
If inkjet printing is used for large area fabrication, then production cost decreases, but printing ink formulation becomes more complex
Solution Approach 1:
The patent systematically optimizes key ink parameters (viscosity to 10-100 cP, surface tension to 20-50 mN/m) to achieve universal applicability for inkjet printing. By establishing these specific parameter ranges, the patent simplifies the ink formulation development process while maintaining large area fabrication capability and cost effectiveness
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 enables the production of high-quality functional films with improved optoelectronic properties and reduced costs by optimizing ink properties for inkjet printing, enhancing the performance and efficiency of electronic devices.
Implementation Method 1
The inorganic ester solvent has a boiling point of 150°C or higher, and can be evaporated from a solvent system to form a film of functional material
Data Source
AI summary
A printing formulation, an electronic device comprising a function layer prepared from the printing formulation and a preparation method for obtaining a functional material thin film by utilizing the printing formulation. The printing formulation comprises at least one functional material and at least one inorganic ester solvent, and the inorganic ester solvent can be selected from alkyl borate or alkyl phosphate.