Lighting Device With Non-Uniform Wavelength Conversion Element
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Solution Overview
Problem
Lighting devices with laser diodes face high thermal loads due to wavelength conversion, leading to power losses and inefficient heat dissipation in the light wavelength conversion element.
Innovation Solution
A lighting device design featuring a light wavelength conversion element with varying thickness, where the edge is thicker than the centroid, and materials with high thermal conductivity, along with a reduced cerium concentration in the phosphor, to enhance thermal dissipation and minimize thermal load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the light wavelength conversion element uses uniform thickness across the substrate, then the manufacturing is simpler, but the thermal dissipation is inefficient and thermal loads are not evenly distributed
Solution Approach 1:
The substrate is designed with non-uniform thickness, where the thickness varies across different regions of the substrate. Specifically, the substrate has a first thickness in a first region and a second thickness in a second region, with the thickness gradient designed to match the thermal load distribution from the phosphor layer. This local variation in thickness optimizes heat dissipation pathways while maintaining manufacturing feasibility through standard machining processes.
2Ease of manufacture
If the phosphor layer has uniform thickness, then the manufacturing is easier, but the thermal load distribution is uneven and heat dissipation is inefficient
Solution Approach 1:
The phosphor layer is applied with varying thickness across the substrate, corresponding to the substrate thickness variation. The phosphor layer has a first thickness in regions where the substrate is thinner and a second thickness in regions where the substrate is thicker. This non-uniform phosphor distribution optimizes the balance between light conversion efficiency and thermal dissipation, reducing overall power losses while maintaining uniform light emission.
3Ease of manufacture
If the cerium concentration in phosphor is uniform, then the manufacturing is simpler, but the light emission uniformity and thermal management are compromised
Solution Approach 1:
The phosphor material is synthesized with non-uniform cerium concentration distribution. The phosphor composition varies across different regions, with higher cerium concentrations in regions requiring enhanced light conversion and lower concentrations in regions where thermal dissipation is prioritized. This local compositional variation enables precise control over light emission characteristics while optimizing thermal management, achieving uniform overall light color despite local variations.
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 reduces thermal load on the light wavelength conversion element, ensuring efficient heat dissipation and maintaining uniform light emission with a homogeneous color, thereby improving the overall performance and longevity of the lighting device.
Implementation Method 1
The light wavelength conversion element includes phosphor which is arranged on a surface region of a substrate and is used for wavelength conversion of the light emitted by the at least one laser light source
Implementation Method 2
The light wavelength conversion element has a greater thickness at the edge of the surface region, provided with phosphor, of the substrate than at the surface centroid of the surface region, provided with phosphor, of the substrate... allows better thermal dissipation from the light wavelength conversion element to the surroundings
Data Source
AI summary
In various embodiments, a lighting device includes at least one laser light source and a light wavelength conversion element. The light wavelength conversion element includes phosphor which is arranged on a surface region of a substrate and is used for wavelength conversion of the light emitted by the at least one laser light source. The light wavelength conversion element has a greater thickness at the edge of the surface region, provided with phosphor, of the substrate than at the surface centroid of the surface region, provided with phosphor, of the substrate. The thickness is respectively measured perpendicularly to the surface region, provided with phosphor, of the substrate.