Phosphor Module Black Matrix Layer Yellow Ring Reduction
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Solution Overview
Problem
The existing phosphor modules in laser light sources suffer from thermal quenching and the generation of a 'yellow ring' due to the scattering of yellow light, which reduces light conversion efficiency and increases the area of the yellow ring, making it difficult to control the particle size and pores of ceramic phosphors used in these modules.
Innovation Solution
A phosphor module structure is introduced that includes a radiating body, a phosphor layer, a reflective layer, and a black matrix layer, where the reflective layer surrounds the phosphor layer to reflect light and the black matrix layer absorbs light, reducing the area of the phosphor layer and minimizing the yellow ring while maintaining light conversion efficiency by improving heat dissipation and reducing blue noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a phosphor layer is used in a laser light source, then light conversion from blue to yellow wavelength is achieved, but thermal quenching occurs and a yellow ring is generated due to scattering
Solution Approach 1:
The phosphor layer is divided into multiple sub-layers with different phosphor materials having progressively higher refractive indices from the blue laser incident side toward the yellow light emission side. This segmentation creates a gradient structure that controls light scattering and reduces the yellow ring effect while maintaining efficient light conversion.
Solution Approach 2:
Different regions of the phosphor layer are assigned different phosphor materials with specific refractive indices tailored to their local position in the gradient structure. The first phosphor material has a lower refractive index near the incident side, while the second phosphor material has a higher refractive index toward the emission side, optimizing light conversion at each location.
2Stability of the object's composition
If ceramic phosphors are used in the phosphor module, then high temperature stability is improved, but it becomes difficult to control particle size and pores due to high sintering temperatures
Solution Approach 1:
The invention changes the material parameter (refractive index) by selecting different phosphor materials for different layers, and changes the structural parameter (layering configuration) to achieve the desired optical performance. This allows control over light scattering and yellow ring formation without requiring precise control of particle size and pores that is difficult to achieve with ceramic phosphors.
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 proposed structure effectively minimizes the yellow ring and enhances light uniformity by increasing the brightness of the phosphor module and reducing thermal quenching, while also addressing the challenges of using ceramic phosphors with high sintering temperatures.
Implementation Method 1
a phosphor layer disposed at the radiating body, the phosphor layer being configured to absorb light having a first wavelength and emit light having a second wavelength different from the first wavelength
Implementation Method 2
a reflective layer that surrounds a side surface of the phosphor layer and is configured to reflect light
Implementation Method 3
a black matrix layer disposed at the reflective layer and configured to absorb light
Data Source
AI summary
A phosphor module for a laser light source includes a radiating body, a phosphor layer disposed at the radiating body, the phosphor layer being configured to absorb light having a first wavelength and emit light having a second wavelength different from the first wavelength, a reflective layer that surrounds a side surface of the phosphor layer and is configured to reflect light, and a black matrix layer disposed at the reflective layer and configured to absorb light. The black matrix layer is disposed at an edge of the phosphor layer.