UV Absorbing Thin Film Encapsulation for OLED Light Stability
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Solution Overview
Problem
Organic light-emitting devices are susceptible to damage from external ultraviolet light, which can degrade the emission layer and other components, especially when used in outdoor applications or during manufacturing processes that involve UV irradiation.
Innovation Solution
An electronic apparatus with a thin film encapsulation portion containing a UV absorber, such as a cured product of a composition including a (meth)acrylate compound and a UV absorber, is used to reduce the amount of ultraviolet light transmitted to the organic light-emitting device, protecting it from UV-induced damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the organic light-emitting device is used in outdoor applications or during manufacturing processes that involve UV irradiation, then the device can operate in various environments, but the emission layer and other components are damaged by ultraviolet light
Solution Approach 1:
The patent introduces an intermediary substance (UV absorber or UV-shielding material) between the harmful UV light and the organic light-emitting device. This intermediary absorbs or blocks UV radiation while allowing the device to operate in outdoor environments, thus resolving the contradiction between environmental adaptability and UV damage protection
Solution Approach 2:
The patent converts the harmful UV radiation into a beneficial effect by using UV-absorbing materials that transform UV energy into harmless forms (such as heat or stable chemical bonds). The UV light that would normally damage the emission layer is instead absorbed by specially designed UV-shielding materials, protecting the device while maintaining outdoor usability
2Reliability
If a sealing thin film encapsulation portion is added to protect the organic light-emitting device from UV light, then the device is protected from deterioration, but the device structure becomes more complex
Solution Approach 1:
The patent merges the sealing/encapsulation function with the UV protection function into a single integrated structure. The sealing thin film encapsulation portion simultaneously provides both mechanical protection and UV shielding, eliminating the need for separate protective layers and thus reducing overall structural complexity while maintaining high reliability
Solution Approach 2:
The sealing thin film encapsulation portion is designed to perform multiple functions: it serves as both a protective seal against environmental factors and a UV-shielding barrier. This multi-functional design reduces the number of separate components needed, simplifying the overall device structure while enhancing protection reliability
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 prevents UV light from penetrating and causing damage to the organic light-emitting device, ensuring the longevity and performance of the device by maintaining light stability and preventing deterioration of the emission layer and insulating films.
Implementation Method 1
the composition comprising a curable material and an ultraviolet (UV) absorber
Implementation Method 2
the curable material is a (meth)acrylate compound
Data Source
AI summary
An electronic apparatus that is presented has a substrate; an organic light-emitting device disposed on the substrate; and a thin film encapsulation portion sealing the organic light-emitting device and comprising at least one organic film. The organic film includes a cured product of a composition for forming an organic film, the composition comprising a curable material and an ultraviolet (UV) absorber. The curable material includes a (meth)acrylate compound. The organic light-emitting device includes a first electrode, a second electrode facing the first electrode, an emission layer between the first electrode and the second electrode, and a hole transport region between the first electrode and the emission layer. The emission layer includes a first compound represented by Formula 1, and the hole transport region includes a second compound represented by Formula 2: