Sulfonate Salt Encapsulation for OLED Barrier and Cost Reduction
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Solution Overview
Problem
Conventional encapsulating processes for organic electroluminescence devices are complex, costly, and only applicable to bottom emission devices, with poor barrier properties against oxygen and moisture, which limits their service life and applicability.
Innovation Solution
A protective layer of sulfonate salt is formed on the top electrode of the light-emitting device, allowing for a simple and cost-effective encapsulation process that includes a transparent encapsulating cover with a frame sealant, providing a good barrier against oxygen and moisture and enabling encapsulation of both top and bottom emission devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional encapsulating process is used, then encapsulation is achieved, but the operational complexity increases and cost increases
Solution Approach 1:
The patent extracts and eliminates the drying slide component from the encapsulation structure. By removing this unnecessary component, the encapsulation process becomes simpler while maintaining effectiveness, directly resolving the contradiction between encapsulation effectiveness and operational complexity
Solution Approach 2:
The encapsulation process is designed to be universal, applicable to both top emission and bottom emission OLED devices. This multi-functionality eliminates the need for different encapsulation procedures for different device types, reducing operational complexity while maintaining encapsulation effectiveness
2Reliability
If conventional encapsulating process is used, then encapsulation is achieved, but the curing time increases
Solution Approach 1:
By removing the drying slide component, the patent eliminates the drying step from the encapsulation process. This extraction of unnecessary elements directly reduces curing time while maintaining encapsulation effectiveness through the simplified direct encapsulation method
3Reliability
If conventional encapsulating process is used, then encapsulation is achieved, but the cost increases
Solution Approach 1:
The patent removes the drying slide component and associated drying process, eliminating unnecessary material costs and processing costs. This extraction of redundant elements directly reduces manufacturing cost while preserving encapsulation effectiveness
Solution Approach 2:
The patent employs a simpler encapsulation approach that eliminates expensive specialized components like drying slides. By using more economical materials and processes, the manufacturing cost is reduced while maintaining adequate encapsulation effectiveness
4Reliability
If conventional encapsulating process is used, then encapsulation is achieved, but the barrier property against oxygen and moisture deteriorates
Solution Approach 1:
The patent employs composite encapsulation structures combining different materials with complementary properties. This use of composite materials enhances the barrier properties against oxygen and moisture while maintaining structural integrity and encapsulation effectiveness
5Reliability
If drying slide is used in encapsulation, then encapsulation is achieved, but the applicability to top emission devices deteriorates
Solution Approach 1:
The patent designs an encapsulation process that works universally for both top emission and bottom emission OLED devices. By eliminating the drying slide and adopting a通用的 encapsulation approach, the system achieves adaptability across different device types while maintaining encapsulation effectiveness
Solution Approach 2:
By removing the drying slide component that limited applicability to bottom emission devices only, the patent enables the encapsulation process to be applied to both top emission and bottom emission devices, thereby improving device type applicability while maintaining encapsulation 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 encapsulation process results in a compact self-assembled film that effectively blocks water and oxygen invasion, improving the device's barrier properties, reducing operational complexity and cost, and extending the device's service life while allowing for the encapsulation of top emission devices.
Implementation Method 1
The protective layer of sulfonate salt can form a compact self-assembled film on the metal cathode of the organic electroluminescence device
Implementation Method 2
The anion at one side of the film can undergo a replacement reaction with the surface of the metal cathode to form a more compact protective layer film
Implementation Method 3
the hydrophobic moiety at the other side can block the invasion of water and oxygen
Data Source
AI summary
An encapsulated structure of a light-emitting device, an encapsulating process thereof, and a display device comprising said encapsulated structure. The encapsulated structure of the light-emitting device comprises: a light-emitting device; and a protective layer of a sulfonate salt formed on a top electrode of the light-emitting device, the sulfonate salt having the following structure:wherein the cation X+ is Li+, Na+ or K+; andR is a substituent selected from the group consisting of unsubstituted alkyl groups having more than 5 carbon atoms, substituted alkyl groups having more than 5 carbon atoms, and alkoxyl groups having more than 5 carbon atoms.