Laser Light Emitting Element with Uneven Fluorescent Surface
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Solution Overview
Problem
Existing light emitting devices using fluorescent material layers are not effective in reducing the coherency of exciting light, particularly when irradiated with high-coherency light sources like lasers, which can pose safety risks due to potential reflection and directivity.
Innovation Solution
A light emitting element with a substrate-coated fluorescent material particle layer having an uneven surface, where the coating layer does not fill gaps between particles, scattering the exciting light and reducing coherency, while improving adhesiveness and thermal conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a fluorescent material layer is formed with a smooth surface by filling gaps between particles, then light scattering is reduced and illumination uniformity is improved, but coherency of exciting light is not reduced and safety risks remain
Solution Approach 1:
The patent applies local quality by creating an uneven surface structure at the microscopic level (maintaining particle gaps) while achieving macroscopic illumination uniformity through controlled light scattering. The surface is deliberately kept non-smooth to scatter laser light and reduce coherency, while the overall layer structure ensures uniform light distribution.
Solution Approach 2:
The patent converts the potentially harmful effect of light scattering (which causes non-uniform illumination) into a beneficial feature by using it to reduce laser coherency. The uneven surface that scatters light is intentionally designed to prevent laser reflection and maintain illumination uniformity simultaneously, turning a disadvantage into an advantage for safety.
2Object-affected harmful factors
If an uneven surface is formed to scatter light and reduce coherency, then safety is improved, but illumination uniformity deteriorates
Solution Approach 1:
The patent applies parameter changes by controlling the refractive index of the fluorescent material particles and the surface roughness parameters to achieve optimal light scattering. By adjusting particle size distribution, spacing, and surface topology, the design scatters laser light to reduce coherency while maintaining uniform illumination through controlled optical parameters.
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 enhances safety by reducing the coherency of exciting light, improving durability and thermal management, leading to a longer lifespan and safer operation of light emitting devices.
Implementation Method 1
scattering the exciting light and reducing coherency
Implementation Method 2
emitting fluorescence in response to exciting light with which fluorescent material particles are irradiated
Data Source
AI summary
A light emitting section emits fluorescence upon receiving exciting light emitted from a laser element. The light emitting section includes a plurality of fluorescent material particles made from a single type of fluorescent material or several types of fluorescent materials, the plurality of fluorescent material particles being accumulated on a metal substrate to form a layer of the plurality of fluorescent material particles. Each of the plurality of fluorescent material particles has a surface coated with a coating layer. The coating layer forms an uneven shape of a surface of the light emitting section.