Organic Electroluminescent Formulation Printing
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Solution Overview
Problem
Current methods for producing organic electroluminescent devices, particularly those using low-molecular compounds, face challenges in cost-effectiveness, scalability for large-area devices, and achieving high-resolution screens, with existing vapor deposition techniques being costly and inefficient for producing devices with optimal properties such as luminous efficacy and long service life.
Innovation Solution
A formulation comprising a low-molecular-weight organic matrix material, a low-molecular-weight emitter, and an aromatic solvent with specific structural characteristics, enabling the use of common printing processes to produce emitting layers with improved properties and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If vapor deposition techniques are used to produce organic electroluminescent devices, then the devices achieve favorable property profiles, but the production cost increases significantly and scalability to large-area devices is limited
Solution Approach 1:
The patent replaces the mechanical vapor deposition process with a solution-based printing process. The organic compounds are dissolved in a solvent to form a formulation that can be deposited using printing techniques, eliminating the need for complex vacuum deposition equipment and multi-chamber systems while maintaining device performance
Solution Approach 2:
The patent changes the physical state of the organic materials from vapor phase to solution phase. By formulating the organic compounds in a suitable solvent with specific molecular weight and structural characteristics, the material can be processed using low-cost printing methods instead of expensive vapor deposition
2Reliability
If vapor deposition techniques are used to produce organic electroluminescent devices, then the devices achieve favorable property profiles, but the process complexity and equipment requirements increase
Solution Approach 1:
The patent replaces the complex mechanical vapor deposition system with a simple solution-based printing process. The formulation approach allows using standard printing equipment rather than specialized vacuum deposition chambers, significantly reducing process complexity
Solution Approach 2:
The patent extracts the organic active materials from the vapor phase and transfers them to a solution phase. This extraction allows the use of simpler processing methods while maintaining the functional properties of the deposited layers
3Ease of manufacture
If conventional printing processes are used without specific formulation, then cost-effectiveness improves, but the ability to produce high-resolution screens and achieve optimal device properties deteriorates
Solution Approach 1:
The patent optimizes the formulation parameters including solvent molecular weight (≤3,000 g/mol), emitter molecular weight (≤3,000 g/mol), and specific aromatic compound structures to achieve both cost-effectiveness and high-resolution printing capability
Solution Approach 2:
The patent creates a composite formulation system combining specifically selected organic matrix materials, emitters, and aromatic solvents. This composite approach enables the formulation to exhibit properties that allow high-resolution printing while maintaining 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 formulation allows for cost-effective production of organic electroluminescent devices with enhanced performance, including high luminous efficacy, extended service life, and adaptability for various applications across a wide temperature range, using common printing processes.
Implementation Method 1
A formulation comprising a low-molecular-weight organic matrix material and a low-molecular-weight emitter and an aromatic compound as a solvent
Data Source
Figure 1
AI summary
The invention relates to a formulation containing at least one organically functional material that can be used for making functional layers in electronic devices, and at least one aromatic compound. The invention further relates to electronic devices that can be obtained from said formulations.