UV LED Light Emitting Device Transparent Window Insulation Protection
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Solution Overview
Problem
Light emitting devices with UV LEDs on metal substrates face issues with ultraviolet light causing discoloration and degradation of organic materials in the insulation layer, leading to reduced light output and reliability.
Innovation Solution
A light emitting device design featuring a ceramic substrate with a heat radiation block and a transparent window, where the light emitting chip is mounted on a sub-mount and encapsulated within a cavity formed by the substrate and body, with a cap having a transparent window to prevent UV damage and enhance heat dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a UV LED is mounted on a metal substrate with an insulation layer, then the light emitting device can be constructed with good electrical insulation, but the ultraviolet light causes discoloration and deterioration of the organic material in the insulation layer, reducing light output and reliability
Solution Approach 1:
A transparent window member is introduced as an intermediary component between the UV LED and the external environment. This window member selectively transmits visible light while blocking harmful UV radiation, thereby protecting the insulation layer from UV-induced deterioration without interfering with the light emission function
Solution Approach 2:
The patent converts the harmful UV radiation into a beneficial protective function by using the transparent window member to block UV light. The same optical path that would otherwise cause damage is now used to selectively transmit visible light while filtering out the harmful UV component, turning a harmful effect into a protective mechanism
2Illumination intensity
If the light emitting chip is exposed to extract light efficiently, then light output is improved, but the organic insulation layer is exposed to UV light causing degradation
Solution Approach 1:
The transparent window member introduces local quality differentiation by allowing visible light to pass through while selectively blocking UV radiation. This creates different optical properties in different wavelength ranges, enabling high light extraction efficiency for visible light while providing localized UV protection to the insulation layer
3Reliability
If a protective layer is added to prevent UV damage, then reliability is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The transparent window member serves multiple functions simultaneously: it acts as a protective barrier against UV radiation, serves as an optical element for light extraction, and provides structural support for the LED chip mounting. This multi-functionality reduces the need for separate protective layers and simplifies the overall device structure
Solution Approach 2:
The transparent window member is made from a composite or specially selected material that combines optical transparency with UV-blocking properties. This composite approach allows a single component to provide both protection and optical functionality without requiring additional layers
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
This design improves light extraction efficiency, maintains reliability by preventing UV-induced degradation, and enhances thermal management, resulting in improved light output and extended lifespan.
Implementation Method 1
a heat radiation block inserted into the third hole
Implementation Method 2
a transparent window which is disposed in the second hole
Data Source
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AI summary
A light emitting device may be provided that includes: a substrate; a body which is disposed on the substrate and has a first hole having a predetermined size; a light emitting chip which is disposed within a cavity formed by the substrate and the first hole of the body; a cap which is disposed on the body and has a second hole having a predetermined size; and a transparent window which is disposed in the second hole, wherein a lower portion of the cap is divided into a first surface and a second surface more projecting downwardly than the first surface and wherein at least a portion of the first surface is attached and fixed to the body.