Laser Reflector Layout for Uniform Fluorescent Light Emission
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Solution Overview
Problem
In existing light emitting devices, the optical intensity of laser light is higher at the center portion than the peripheral portion on the fluorescent material's light-receiving surface, leading to heat generation and degradation, as well as uneven light emission intensity and color distribution.
Innovation Solution
The light emitting device employs a light-reflecting surface arrangement that overlaps laser light reflections from different regions to achieve uniform light intensity distribution on the fluorescent part, reducing heat-induced degradation and color unevenness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If laser light is irradiated onto the fluorescent material with high optical intensity at the center portion, then the light emission intensity is enhanced, but heat is generated at the center portion causing degradation of conversion efficiency and light emission uniformity
Solution Approach 1:
The light-reflecting surface is designed with different local properties: a first light-reflecting surface with a first reflectivity and a second light-reflecting surface with a second reflectivity. This creates non-uniform light reflection distribution, where the center portion receives less reflected light intensity compared to the peripheral portion, thereby reducing heat concentration at the center and improving conversion efficiency uniformity across the fluorescent material
Solution Approach 2:
The patent changes the reflectivity parameter of the light-reflecting surface at different locations. By setting the first reflectivity of the first light-reflecting surface to be different from the second reflectivity of the second light-reflecting surface, the light intensity distribution on the fluorescent material is optimized to prevent excessive heat generation at the center while maintaining overall high light emission intensity
2Illumination intensity
If laser light is irradiated onto the fluorescent material with high optical intensity at the center portion, then the light emission intensity is enhanced, but light emission uniformity and color uniformity deteriorate
Solution Approach 1:
The light-reflecting surface is designed with different local properties: a first light-reflecting surface with a first reflectivity and a second light-reflecting surface with a second reflectivity. This creates non-uniform light reflection distribution, where the center portion receives less reflected light intensity compared to the peripheral portion, thereby reducing heat concentration at the center and improving conversion efficiency uniformity across the fluorescent material
Solution Approach 2:
The patent introduces asymmetry in the light-reflecting surface configuration by having different reflectivities at different locations. This asymmetric design compensates for the natural tendency of laser light to concentrate at the center, creating a more uniform light intensity distribution that improves both light emission uniformity and color uniformity across the fluorescent material surface
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 arrangement enhances wavelength conversion efficiency and uniformity of light emission by minimizing heat generation and intensity differences across the fluorescent part.
Implementation Method 1
one or more light-reflecting parts, each having a light-reflecting surface configured to reflect the laser light emitted from a corresponding one of the one or more semiconductor laser elements
Implementation Method 2
a fluorescent part having a light-receiving surface configured to be irradiated with the laser light reflected at the light-reflecting surface of each of the one or more light-reflecting parts
Data Source
AI summary
A light emitting device includes: a base member; a first semiconductor laser element disposed on an upper surface of the base member, wherein the first semiconductor laser element is configured to emit laser light from a first light emitting surface; a first light-reflecting member disposed on the upper surface of the base member, wherein the first light-reflecting member has a first light-reflecting surface configured to reflect the first laser light; a second semiconductor laser element disposed on the upper surface of the base member, wherein the second semiconductor laser element is configured to emit laser light from a second light emitting surface; and a second light-reflecting member disposed on the upper surface of the base member, wherein the second light-reflecting member has a second light-reflecting surface configured to reflect the second light.