Light Emitting Structure Anti-Reflective Coating Moisture Protection
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Solution Overview
Problem
Light emitting chips face reduced light extraction efficiency due to quartz material absorption and the propensity of anti-reflective coatings to peel in high temperature and high humidity environments, making it difficult to maintain efficiency over long term use.
Innovation Solution
A light emitting structure comprising a substrate, light emitting chip, side wall, cover, anti-reflective coating, and protective layer, where the anti-reflective coating is on the cover and the protective layer is outside, enhancing light extraction efficiency and preventing moisture intrusion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If quartz material is used as the cover, then the cover provides good structural stability and protection, but the light extraction efficiency is reduced due to light absorption
Solution Approach 1:
An anti-reflective coating layer is introduced as an intermediary between the quartz cover and the light emitting chip. This coating layer has a refractive index介于 quartz and air, reducing optical reflection and absorption at the interface, thereby improving light extraction efficiency while maintaining the structural stability of the quartz cover
Solution Approach 2:
The cover structure is designed as a composite system combining quartz material with an anti-reflective coating layer. This composite structure leverages the mechanical strength and protection of quartz while the coating layer optimizes optical properties to reduce light absorption and improve extraction efficiency
2Loss of energy
If anti-reflective coating is applied to improve light extraction efficiency, then light extraction efficiency increases, but the coating peels in high temperature and high humidity environments
Solution Approach 1:
A protective layer is applied over the anti-reflective coating as a thin film structure. This protective film acts as a barrier that shields the anti-reflective coating from high temperature and high humidity environments, preventing peeling while allowing the coating to maintain its light extraction enhancement function
Solution Approach 2:
The protective layer is applied in advance before the product is exposed to harsh environments. This pre-applied protection cushioning prevents the anti-reflective coating from direct contact with damaging environmental factors, thereby preventing peeling and maintaining coating stability throughout the product lifecycle
3Loss of energy
If anti-reflective coating is used to enhance light extraction, then initial light extraction efficiency improves, but efficiency deteriorates over long term use
Solution Approach 1:
A protective layer is introduced as a thin film structure that encapsulates the anti-reflective coating. This protective film prevents environmental factors such as moisture and oxygen from degrading the coating over time, thereby maintaining the light extraction efficiency improvement throughout the extended service life of the product
Solution Approach 2:
The protective layer is applied beforehand to shield the anti-reflective coating from long-term environmental exposure. This pre-protection ensures that the coating maintains its optical properties and adhesion characteristics over extended periods, preventing efficiency deterioration during long term use
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 structure improves light extraction efficiency and maintains it over time, even in harsh conditions, by using an anti-reflective coating on the cover and a protective layer that extends to cover the joints, preventing moisture ingress.
Implementation Method 1
an anti-reflective coating is used in the related art to increase the light extraction efficiency
Implementation Method 2
a protective layer is disposed on outside of the cover... can prevent moisture intrusion into the enclosed space
Data Source
AI summary
A light emitting structure includes a substrate, at least one light emitting chip disposed on the substrate and, a side wall disposed on the substrate and surrounding the at least one light emitting chip, a cover disposed on the side wall, an anti-reflective coating disposed on the cover, and a protective layer disposed on outside of the cover, wherein the cover, the side wall and the substrate define an enclosed space for accommodating the at least one light emitting chip.