Curable OLED Coating Compounds for Large-Area Solution Processing
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Solution Overview
Problem
Existing organic light emitting devices face challenges in material loss during deposition processes and difficulty in manufacturing large-area devices, necessitating the development of materials suitable for solution processes.
Innovation Solution
A novel compound represented by Chemical Formula 1, which includes a fluorenyl group with a fluoro group and heteroaryl group, is used to form a coating composition for organic material layers, enabling stable thin film formation through heat or light treatment, facilitating hole migration, and allowing large-area device manufacturing via solution processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a deposition process is used to manufacture organic light emitting devices, then device performance can be achieved, but material loss occurs frequently and large-area manufacturing becomes difficult
Solution Approach 1:
The patent replaces the mechanical deposition process with a solution process. The coating composition is applied as a liquid solution that is then cured to form the organic material layer, eliminating the material loss associated with vacuum deposition while maintaining device performance
Solution Approach 2:
The patent changes the physical state of the organic material from solid (deposition) to liquid solution (coating), and then transforms it through curing. This parameter change enables large-area manufacturing without material loss while achieving the required device performance
2Reliability
If a deposition process is used to manufacture organic light emitting devices, then device performance can be achieved, but manufacturing large-area devices becomes difficult
Solution Approach 1:
The patent replaces the mechanical deposition process with a solution coating process that can be applied over large areas. The liquid coating composition can be uniformly applied to large substrates followed by curing, enabling large-area device manufacturing while maintaining performance
Solution Approach 2:
The patent transitions from a vacuum-based three-dimensional deposition process to a surface-based liquid coating process. This dimensional change allows for easier scaling to large areas while maintaining uniform film formation and device performance
3Area of stationary object
If a solution process is used to manufacture organic light emitting devices, then large-area manufacturing becomes possible, but material stability during processing may be compromised
Solution Approach 1:
The patent incorporates curable groups in the compound structure that remain dormant during solution processing and are activated by heat or light treatment. This preliminary action allows the material to maintain stability during coating while enabling subsequent crosslinking to achieve the required compositional stability
Solution Approach 2:
The patent uses a composite molecular structure combining the core compound with curable functional groups. This composite approach allows the material to exhibit both solution processability and post-curing stability, resolving the contradiction between processability and compositional stability
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 compound improves interfacial characteristics, enhances hole mobility, reduces driving voltage, and extends the service life of organic light emitting devices while allowing for large-area manufacturing without material loss.
Implementation Method 1
enabling stable thin film formation through heat or light treatment
Implementation Method 2
electrons and holes are injected into the organic material layer from the cathode and the anode, respectively. The electrons and the holes which are injected into the organic material layer are recombined to form an exciton, and the exciton falls down again to the ground state to emit light
Data Source
Figure 1
AI summary
The present specification relates to a compound represented by Chemical Formula 1, a coating composition including the compound represented by Chemical Formula 1, an organic light emitting device using the same, and a method of manufacturing the same.