Cross-linkable Polymer for Stable Wet-Process OLED Interfaces
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Solution Overview
Problem
Existing organic light emitting diodes (OLEDs) fabricated using wet processes face challenges in achieving excellent device performance and multi-layer stacking due to material elution and interface instability, particularly when compared to vacuum deposition methods, which are costly and limited for large-sized displays.
Innovation Solution
A polymer with a specific repeating unit structure, including a cross-linkable functional group, is used as a host or charge-transporting material in organic thin layers, enhancing interface stability and allowing for controlled energy band gaps, thereby improving hole and electron transport properties and preventing solvent-induced elution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If vacuum deposition is used to fabricate OLEDs, then device performance is excellent, but process cost is high and large-sized display application is limited
Solution Approach 1:
The patent replaces the mechanical vacuum deposition system with a wet chemical process system. Specifically, it uses a self-organized monolayer formation approach where organic compounds are deposited from solution onto the substrate, eliminating the need for vacuum equipment while achieving comparable device performance and enabling large-area fabrication
Solution Approach 2:
The patent changes the deposition parameters from vacuum-based physical deposition to solution-based chemical deposition. By controlling parameters such as solution concentration, deposition time, and solvent evaporation conditions, the patent achieves controlled monolayer formation that maintains device performance while reducing manufacturing complexity and cost
2Ease of manufacture
If wet process is used to form organic thin layers, then cost is reduced and large-sized display fabrication is enabled, but material elution occurs and multi-layer stacking is difficult
Solution Approach 1:
The patent introduces an intermediary mechanism where the first organic compound acts as a self-organized monolayer that prevents solvent penetration to underlying layers. This monolayer serves as a protective barrier that eliminates material elution while maintaining the benefits of wet process fabrication
Solution Approach 2:
The patent applies preliminary action by forming the self-organized monolayer of the first organic compound before depositing subsequent organic thin layers. This pre-formed monolayer prevents solvent-induced elution of underlying layers during subsequent wet processing steps, enabling stable multi-layer stacking
3Ease of manufacture
If wet process is used to form organic thin layers, then cost is reduced, but device performance is inferior compared to vacuum deposition
Solution Approach 1:
The patent applies local quality by creating a specific self-organized monolayer structure at the interface between the substrate and subsequent organic layers. This localized structural organization at the critical interface region enhances charge transport and device performance, compensating for the generally simpler wet process fabrication
Data Source
AI summary
A polymer, an organic photoelectric device, and a display device, the polymer including a repeating unit represented by the following Chemical Formula 1: