OLED Energy Blocking Layer for Radiation and Fire Safety
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Organic Light Emitting Diodes (OLEDs) are susceptible to degradation from environmental factors such as water, oxygen, electromagnetic radiation, and combustibility, which reduces their lifespan and compliance with fire safety standards, especially in large-area, flexible, and lighting applications.
Innovation Solution
An OLED package is designed with a multi-layer energy blocking system comprising a polymeric fire retardant layer, a glass-based UV and IR radiation blocking layer, a conductive layer for electromagnetic interference attenuation, and a hydrophobic moisture blocking layer, enhancing hermetic encapsulation, light transmission, and combustibility resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If OLEDs are packaged with traditional encapsulation materials, then the device structure is simple, but the materials degrade rapidly when exposed to water, oxygen, and electromagnetic radiation, reducing device lifespan
Solution Approach 1:
The encapsulation package is divided into multiple functional layers: a first encapsulation layer for basic protection, a second encapsulation layer with enhanced barrier properties, and a third encapsulation layer for additional protection. Each layer serves specific protective functions against different environmental factors, thereby extending device lifespan through segmented defense rather than relying on a single complex material.
Solution Approach 2:
The patent employs composite encapsulation structures combining different materials with complementary properties. The encapsulation layers use combinations of inorganic barrier layers and organic protective layers, creating a multi-material system that provides superior protection against moisture, oxygen, and radiation compared to single-material solutions, thus improving reliability without excessive complexity.
2Ease of manufacture
If polymeric materials are used in OLED packaging, then the structure is flexible and easy to manufacture, but the materials are sensitive to radiation and degrade when exposed to UV and IR radiation, causing yellowing and water penetration
Solution Approach 1:
Inorganic barrier layers are introduced as intermediary protective elements between the polymeric encapsulation materials and the harmful UV/IR radiation. These inorganic layers act as mediators that absorb or reflect radiation before it can reach and degrade the polymeric materials, thereby preserving both the flexibility of the polymer structure and resistance to radiation-induced yellowing and water penetration.
Solution Approach 2:
Different regions of the encapsulation package are assigned different material properties: polymeric layers provide flexibility and conformability in areas requiring bending, while inorganic barrier layers are positioned in regions where radiation blocking is most critical. This localized assignment of material qualities allows the package to simultaneously achieve flexibility and radiation resistance without compromising either property uniformly across the entire structure.
3Reliability
If fire safety requirements are met by using fire retardant materials in building applications, then combustibility is reduced, but the device complexity increases due to additional fire safety compliance layers
Solution Approach 1:
The encapsulation layers are designed to perform multiple functions simultaneously: providing mechanical protection, moisture barrier, radiation shielding, and fire safety compliance. By integrating fire retardant properties into the existing encapsulation structure rather than adding separate fire safety layers, the package achieves multi-functionality that meets fire safety requirements without proportionally increasing device complexity.
Solution Approach 2:
Fire safety functionality is merged with the encapsulation structure by incorporating fire retardant materials into the encapsulation layers. This combining of fire protection with the existing protective envelope eliminates the need for separate fire safety layers, thereby achieving fire safety compliance while minimizing additional complexity in the device structure.
4Reliability
If hermetic encapsulation is implemented to protect OLEDs from environmental factors, then protection from water and oxygen is improved, but light transmission may be compromised by the encapsulation layers
Solution Approach 1:
The optical parameters of the encapsulation layers are carefully controlled and optimized. By adjusting the thickness, composition, and optical properties of each encapsulation layer, the package achieves adequate hermetic protection while maintaining high light transmission. The parameters of the encapsulation materials are changed to balance protective functionality with optical performance, ensuring that protection from environmental degradation does not excessively compromise illumination intensity.
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 protects OLEDs from environmental degradation, improves light transmission, and enhances fire safety compliance, extending the device's lifespan and ensuring safety in various applications.
Implementation Method 1
a glass-based UV and IR radiation blocking layer
Implementation Method 2
a glass-based UV and IR radiation blocking layer
Implementation Method 3
a conductive layer for electromagnetic interference attenuation
Implementation Method 4
a hydrophobic moisture blocking layer
Data Source
Figure 1
Figure 2
Figure 3
AI summary
ORGANIC LIGHT EMITTING DIODE PACKAGE WITH ENERGY BLOCKING LAYER An organic electroluminescent device (201) with new protective packaging. The package (200) has a substantially transparent energy blocking layer (209) disposed near the outer surface (221) of the device. The energy blocking layer (209) is configured to protect the electroluminescent device and packaging from ultraviolet, infrared, and other electromagnetic radiation. The energy blocking layer (209) can also be configured to have a limiting oxygen index (LOI) of greater than twenty-one to reduce combustibility of the device and can optionally contain hydrophobic properties to help protect the device from moisture.