Multilayer Silicone Encapsulation for Corrosion-Resistant Optoelectronics
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Solution Overview
Problem
Optoelectronic components, particularly those used in motor vehicles and street lighting, face stability issues due to corrosion of silver surfaces from gases like H2S, leading to reduced light reflection and color changes, while traditional encapsulants offer limited protection against corrosive gases.
Innovation Solution
A multilayer silicone encapsulation with an interface between two silicone layers provides a high barrier effect against harmful gases and volatile organic compounds, reducing the diffusion of corrosive substances and maintaining light stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional encapsulants are used to protect the optoelectronic semiconductor chip and carrier, then protection from mechanical influences and moisture is improved, but protection against corrosive gases like H2S is insufficient
Solution Approach 1:
The patent employs a multilayer encapsulation structure combining silicone-based materials with additional protective layers. The encapsulation comprises a first silicone-based layer and a second silicone-based layer with different properties, creating a composite material system that provides superior barrier performance against corrosive gases while maintaining mechanical protection and optical transmission.
Solution Approach 2:
The encapsulation is divided into multiple distinct layers rather than using a single homogeneous material. The first silicone-based layer and second silicone-based layer are segmented with different formulations, where the interface between layers creates an additional barrier effect that enhances protection against gas permeation while each layer maintains its individual protective functions.
2Reliability
If a single-layer silicone encapsulation is used, then ease of manufacture is improved, but barrier effect against harmful gases is insufficient
Solution Approach 1:
The encapsulation is divided into multiple distinct layers rather than using a single homogeneous material. The first silicone-based layer and second silicone-based layer are segmented with different formulations, where the interface between layers creates an additional barrier effect that enhances protection against gas permeation while each layer maintains its individual protective functions.
Solution Approach 2:
The patent employs a multilayer encapsulation structure combining silicone-based materials with additional protective layers. The encapsulation comprises a first silicone-based layer and a second silicone-based layer with different properties, creating a composite material system that provides superior barrier performance against corrosive gases while maintaining mechanical protection and optical transmission.
3Illumination intensity
If the semiconductor chip is exposed to corrosive gases, then manufacturing simplicity is maintained, but light reflection and color stability deteriorate
Solution Approach 1:
The patent employs a multilayer encapsulation structure combining silicone-based materials with additional protective layers. The encapsulation comprises a first silicone-based layer and a second silicone-based layer with different properties, creating a composite material system that provides superior barrier performance against corrosive gases while maintaining mechanical protection and optical transmission.
Solution Approach 2:
The multilayer silicone encapsulation acts as an intermediary barrier between the corrosive external environment and the sensitive optoelectronic components. The interface between the two silicone layers creates an additional protective zone that mediates and reduces the diffusion of harmful gases, thereby protecting the silver surfaces and maintaining light 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 multilayer silicone encapsulation significantly enhances the aging resistance of optoelectronic components by creating a strong barrier against corrosive gases, ensuring consistent light output and color stability, even in harsh environments.
Implementation Method 1
an interface between a first silicone-based layer and a second silicone-based layer directly adjacent to the first layer, wherein the interface has a high barrier effect against harmful gases and volatile organic compounds
Implementation Method 2
the housing body is reflective to light in the visible spectral range
Data Source
AI summary
In an embodiment an optoelectronic component includes a carrier, an optoelectronic semiconductor chip and an encapsulation, wherein the semiconductor chip is fixed on a mounting surface of the carrier and is electrically conductively connected with the carrier, wherein the encapsulation is located around the semiconductor chip and covers the mounting surface at least partially, wherein the encapsulation includes a first layer and a second layer, wherein the first layer is arranged between the mounting surface and the second layer, wherein each of the first layer and the second layer is based on a silicone, and wherein the first layer and the second layer are directly adjacent to each other in a region of an interface.