Optoelectronic Component Adhesive Reflection Particles Corrosion
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Solution Overview
Problem
Conventional optoelectronic components with silver reflection coatings degrade due to corrosive gases like H2S, leading to reduced reflectivity and color locus shifts in emitted electromagnetic radiation.
Innovation Solution
Incorporating reflection particles in the adhesive that bonds the semiconductor chip to the reflection coating, with a corrosion protection layer covering the adhesive and edge regions, to maintain efficient reflection and protect against corrosion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a silver reflection coating is used on the chip mounting face, then reflectivity of electromagnetic radiation is improved, but the coating degrades due to corrosion from corrosive gases like H2S
Solution Approach 1:
The reflection coating is divided into two functional zones: a first subsection covered by the semiconductor chip and adhesive where reflection particles are incorporated, and a second subsection covered by a corrosion protection layer. This segmentation allows different parts to serve different purposes - reflection and corrosion protection respectively.
Solution Approach 2:
The solution uses composite structures: the adhesive contains reflection particles (e.g., TiO2, Al2O3) combined with adhesive material, and a corrosion protection layer (e.g., nickel, palladium, or ceramic coatings) is applied over the reflection coating. These composite materials provide both reflective and corrosion-resistant properties simultaneously.
2Illumination intensity
If the reflection coating is exposed to corrosive gases, then the coating provides initial high reflectivity, but the color locus of emitted light changes due to degradation
Solution Approach 1:
A corrosion protection layer is applied in advance to the second subsection of the reflection coating before exposure to corrosive gases. This preliminary protective barrier prevents corrosion from reaching the silver reflection coating, thereby maintaining both reflectivity and color stability over time.
Solution Approach 2:
Different regions of the reflection coating are given different properties: the first subsection under the chip has reflection particles for optimal reflection, while the second subsection has a corrosion protection layer for environmental resistance. This local differentiation optimizes both performance and durability.
3Reliability
If a corrosion protection layer is added to protect the reflection coating, then corrosion resistance is improved, but the device structure becomes more complex
Solution Approach 1:
Multiple functions are merged into integrated structures: the adhesive serves both bonding and reflection functions by incorporating reflection particles, while the corrosion protection layer simultaneously protects both the reflection coating and the adhesive-bonded chip assembly. This merging reduces the need for separate protective components.
Solution Approach 2:
The corrosion protection layer serves multiple purposes: it protects the silver reflection coating from corrosion, provides an additional reflective interface, and seals the edge regions where adhesive protrudes. This multi-functionality reduces overall device complexity by consolidating 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 ensures stable reflectivity and minimizes color locus shifts even when the reflection coating deteriorates, effectively protecting the component from corrosive environments.
Implementation Method 1
the adhesive has reflection particles that reflect electromagnetic radiation emitted by the semiconductor chip
Implementation Method 2
the second subsection is at least partially covered by a corrosion protection layer
Data Source
AI summary
An optoelectronic component includes a carrier having a chip mounting face, wherein the chip mounting face has a reflection coating, and an optoelectronic semiconductor chip adhesively bonded on the reflection coating by an adhesive so that the reflection coating is subdivided into a first subsection covered by the semiconductor chip and a second subsection, which is free of the semiconductor chip, wherein the adhesive has reflection particles that reflect electromagnetic radiation emitted by the semiconductor chip, and the second subsection is at least partially covered by a corrosion protection layer.