QLED Fluoro-Acrylate Encapsulation for Moisture Barrier and Heat Dissipation
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Solution Overview
Problem
Existing quantum dot light emitting diodes (QLEDs) face issues with poor waterproof and oxygen-proof performances, low heat dissipation, short service life, and high production costs due to challenges in sealing and heat management, as well as potential damage from UV curing processes.
Innovation Solution
A quantum dot light emitting diode structure comprising a substrate, bottom electrode, light-emitting function layer, and top electrode, with a fluoro-acrylate copolymer protective layer that provides hydrophobicity, good transmittance, flexibility, and heat dissipation, preventing water and oxygen ingress while allowing efficient heat dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the QLED device is sealed in a water-free environment, then waterproof and oxygen-proof performance is improved, but heat dissipation performance deteriorates
Solution Approach 1:
The patent uses a flexible encapsulation structure with multiple thin film layers (inorganic barrier layers and organic buffer layers) that provide waterproof and oxygen-proof protection while maintaining thermal conductivity for heat dissipation. The flexible thin film structure allows heat to escape while blocking water and oxygen penetration.
Solution Approach 2:
The patent employs composite encapsulation layers combining inorganic materials (for barrier properties against water and oxygen) and organic materials (for flexibility and heat dissipation). This composite structure resolves the contradiction by integrating the advantages of both material types.
2Reliability
If UV curable adhesive is used for packaging, then waterproof and oxygen-proof performance is improved, but production cost increases and device performance may be affected
Solution Approach 1:
The patent extracts and eliminates the UV curable adhesive step from the encapsulation process. Instead, it uses a flexible encapsulation structure with inorganic and organic layers that can be applied without UV irradiation, thereby avoiding additional equipment costs and potential damage to organic layers while maintaining waterproof and oxygen-proof performance.
Solution Approach 2:
The patent replaces expensive UV curable adhesive with a cost-effective flexible encapsulation structure using conventional inorganic and organic materials that do not require specialized UV curing equipment, reducing both material and equipment costs.
3Reliability
If package structure is used, then waterproof and oxygen-proof performance is improved, but transparency and flexible display are diminished
Solution Approach 1:
The patent uses thin film encapsulation layers that are transparent and flexible, allowing light to pass through while providing waterproof and oxygen-proof protection. The thin film structure maintains the flexibility and transparency of the display device.
Solution Approach 2:
The patent transitions from a bulky three-dimensional package structure to a thin two-dimensional film-based encapsulation structure, reducing the impact on transparency and flexibility while maintaining protective functions.
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 effectively prolongs the service life, improves light-emitting efficiency, and reduces production costs by enhancing waterproof and oxygen-proof performance while maintaining flexibility and transparency.
Implementation Method 1
The first protective layer is made from the fluoro-acrylate copolymer, which has hydrophobicity, good transmittance, flexibility, and heat dissipation, and can effectively prevent water and oxygen from penetrating into the internal structure of the quantum dot light emitting diode
Implementation Method 2
The first protective layer is made from the fluoro-acrylate copolymer, which has hydrophobicity, good transmittance, flexibility, and heat dissipation
Data Source
AI summary
A quantum dot light emitting diode and a method for fabricating the same. The quantum dot light emitting diode includes: a substrate, a bottom electrode, a light-emitting function layer, and a top electrode. A functional layer is formed by the bottom electrode, the light-emitting function layer, and the top electrode; and an outer surface of the functional layer is provided with a first protective layer. The first protective layer is made from a fluoro-acrylate copolymer, which has hydrophobicity, good light transmittance, flexibility, and heat dissipation, and can effectively prevent moisture and oxygen from penetrating into an internal structure of the quantum dot light emitting diode, thereby having a good protection effect, and in the meanwhile, the quantum dot light emitting diode can dissipate heat timely, which is beneficial for the device to keep its performance, improve light-emitting efficiency, and the service life.