Optoelectronic Device Barrier Layer Stack Corrosion Protection
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Solution Overview
Problem
Optoelectronic devices with silver-coated surfaces are sensitive to corrosion from gases like hydrogen sulfide, leading to reduced reflectivity and color stability issues, especially in environments like road traffic, where corrosive gases are prevalent.
Innovation Solution
An optoelectronic device with a barrier layer stack comprising an inorganic oxide, oxynitride, or nitride layer combined with a plasma-polymerized siloxane layer is applied to both metallic reflecting and component surfaces to protect against corrosive gases, maintaining reflectivity and color stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If silver is used for the metallic reflecting surface, then reflectivity over the visible spectral range is improved, but sensitivity to corrosive gases worsens
Solution Approach 1:
The patent applies a composite barrier layer stack consisting of multiple layers with different materials (silicone encapsulation, inorganic oxide layer, and organic polymer layer) to protect the silver surface. This composite structure combines the high reflectivity of silver with the protective properties of various barrier materials, resolving the contradiction between maintaining reflectivity and preventing corrosion from corrosive gases like hydrogen sulfide.
2Duration of action of stationary object
If silicone encapsulation is used, then light stability and aging resistance are improved, but gas permeability worsens
Solution Approach 1:
The patent creates a composite encapsulation system where silicone resin is combined with additional barrier layers (inorganic oxide and organic polymer). This composite structure maintains the light stability and aging resistance of silicone while adding gas barrier properties to reduce permeability to corrosive gases.
Solution Approach 2:
The inorganic oxide layer and organic polymer layer act as intermediary barrier layers between the silicone encapsulation and the silver surface. These intermediate layers provide an additional gas barrier function, reducing the gas permeability issue of silicone while preserving its light stability benefits.
3Object-affected harmful factors
If epoxy resins are used for encapsulation, then gas permeability is improved, but light stability worsens
Solution Approach 1:
The patent combines epoxy resin encapsulation with additional barrier layers (inorganic oxide and organic polymer) to create a composite structure. This allows the use of epoxy resin's low gas permeability while adding the light stability benefits of protective coating layers, resolving the contradiction between gas barrier properties and optical stability.
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 barrier layer stack effectively prevents corrosion from hydrogen sulfide and other environmental influences, ensuring high reflectivity and color stability of optoelectronic devices, even in challenging environments, while being cost-effective and efficient.
Implementation Method 1
at least one plasma-polymerized siloxane layer
Implementation Method 2
at least one inorganic oxide, oxynitride or nitride layer
Data Source
AI summary
An optoelectronic device includes at least one optoelectronic semiconductor chip that emits radiation, at least one metallic reflecting surface, at least one functional component having a component surface different from the metallic reflecting surface, and a barrier layer stack for protection against corrosive gases arranged both on the at least one metallic reflecting surface and the component surface, wherein the barrier layer stack includes at least one inorganic oxide, oxynitride or nitride layer and at least one plasma-polymerized siloxane layer.