Phosphor Module Transparent Heat Dissipation Layer
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Solution Overview
Problem
Conventional phosphor modules used in laser light sources suffer from thermal quenching and the 'yellow ring' effect, where yellow light is diffused peripherally instead of being mixed with blue light, leading to inefficient light conversion and reduced illuminance.
Innovation Solution
A phosphor module with a glass phosphor layer and a transparent heat dissipation layer, which includes a light transmissive material like sapphire or Al2O3, is used to absorb blue light and emit yellow light, while also dissipating heat effectively to prevent thermal quenching and minimize the yellow ring effect.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a conventional phosphor module is used with a laser light source, then the structure is simple, but thermal quenching occurs and the yellow ring effect is generated
Solution Approach 1:
The phosphor module is divided into multiple functional layers: a phosphor layer containing glass frit and phosphor particles, a transparent heat dissipation layer, and a reflective layer. This segmentation allows each layer to perform its specific function (light conversion, heat dissipation, light reflection) independently, resolving the thermal stability issue while maintaining structural organization.
Solution Approach 2:
The phosphor layer uses a composite material system consisting of glass frit (providing thermal stability and structural support) combined with phosphor particles (providing light conversion function). The transparent heat dissipation layer uses materials like sapphire or Al2O3 that combine optical transparency with high thermal conductivity, resolving the contradiction between simplicity and thermal stability.
2Productivity
If the phosphor layer thickness is increased to improve light conversion, then more light is absorbed, but heat accumulation increases causing thermal quenching
Solution Approach 1:
The transparent heat dissipation layer acts as an intermediary between the phosphor layer and the external environment. It provides a thermal conduction pathway that efficiently removes heat from the phosphor layer without interfering with the light conversion process, allowing the phosphor layer to be sufficiently thick for high light conversion efficiency while preventing heat accumulation that would cause thermal quenching.
3Productivity
If the phosphor layer is made dense to improve light conversion efficiency, then scattering is reduced, but heat dissipation is impaired
Solution Approach 1:
The system is segmented into two distinct layers with different density characteristics: the phosphor layer (which can be relatively dense for efficient light conversion) and the transparent heat dissipation layer (which has high thermal conductivity for efficient heat removal). This segmentation allows each layer to be optimized for its primary function without compromising the other, resolving the contradiction between light conversion efficiency and heat dissipation.
4Productivity
If a reflective layer is added to improve light utilization, then light conversion efficiency increases, but device complexity increases
Solution Approach 1:
The transparent heat dissipation layer serves multiple functions: it dissipates heat from the phosphor layer, maintains structural integrity, and works in conjunction with the reflective layer to improve overall light utilization. The reflective layer reflects unabsorbed laser light back through the phosphor layer, increasing the probability of absorption and conversion. This multi-functional design improves light utilization efficiency while keeping the overall structure relatively simple.
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 light conversion efficiency, reduces the yellow ring effect, and maintains the phosphor's integrity even at high temperatures, resulting in improved illuminance and reduced scattering, thus providing a more robust and efficient light output.
Implementation Method 1
the phosphor layer configured to: absorb a first light that is emitted from the laser light source and that is incident on a first surface of the phosphor layer, the first surface facing away from the reflective layer; and emit, from a second surface of the phosphor layer that is opposite the first surface and that faces towards the reflective layer, a second light having a second wavelength that is different from a first wavelength of the absorbed first light
Implementation Method 2
a transparent heat dissipation layer disposed on the first surface of the phosphor layer, the transparent heat dissipation layer configured to dissipate heat from the phosphor layer
Data Source
AI summary
A phosphor module for a laser light source includes a heat dissipation body, and a reflective layer disposed on the heat dissipation body including metal or an alloy. The phosphor module also includes a phosphor layer disposed on the reflective layer. The phosphor layer includes a glass frit and a phosphor and is configured to: absorb a first light emitted from the laser light source and incident on a first surface of the phosphor layer facing away from the reflective layer; and emit, from a second surface of the phosphor layer opposite the first surface and facing towards the reflective layer, a second light having a second wavelength different from a first wavelength of the first light. The phosphor module also includes a light-transmissive transparent heat dissipation layer disposed on the first surface of the phosphor layer that dissipates heat from the phosphor layer.