Phosphor Layer Projecting Portions for Light Source Luminance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In light source devices using a semiconductor laser and a phosphor-containing member, increasing the thickness and area of the phosphor-containing layer to improve strength and heat dissipation leads to a decrease in luminance due to laser light spreading within the member.
Innovation Solution
A wavelength conversion member with a light-reflecting member and a phosphor-containing layer featuring projecting portions that are larger than the laser light spot, allowing for improved strength, heat dissipation, and reduced light diffusion, thereby increasing luminance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the thickness and area of the phosphor-containing layer are increased to improve strength and heat dissipation, then strength and heat dissipation are improved, but laser light spreads within the member resulting in decreased luminance
Solution Approach 1:
The phosphor-containing layer is divided into a base component and multiple projecting portions. The base component has a larger area for strength and heat dissipation, while the projecting portions are smaller and strategically positioned to contain laser light spreading. This segmentation allows the different functional requirements (strength/heat dissipation vs. light containment) to be satisfied in different regions of the same component.
Solution Approach 2:
Different regions of the phosphor-containing layer are given different sizes and functions. The base component provides structural support and heat dissipation with its larger area, while the projecting portions optimize light interaction by being smaller and positioned to receive and contain laser light. This local differentiation resolves the contradiction by optimizing each region for its specific function.
2Temperature
If the area of the phosphor-containing member at the substrate side is increased to dissipate heat, then heat dissipation is improved, but laser light spreads within the member resulting in decreased luminance
Solution Approach 1:
The phosphor-containing layer is segmented into a base component with larger area for heat dissipation and smaller projecting portions for light containment. The base component's larger area provides effective heat dissipation to the substrate, while the projecting portions' smaller size prevents excessive light spreading, thus resolving the contradiction between heat dissipation and luminance maintenance.
Solution Approach 2:
The solution transitions from a uniform two-dimensional layer to a three-dimensional structure with varying heights. The base component provides thermal management in the horizontal plane, while the projecting portions rise vertically to create a confined space that limits light spreading in the horizontal direction, effectively decoupling the heat dissipation function from the light containment function.
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 the strength and heat dissipation of the phosphor-containing layer while minimizing light spreading, resulting in improved luminance of the light source device.
Implementation Method 1
The light-reflecting member is configured to reflect laser light
Implementation Method 2
A wavelength conversion member includes a light-reflecting member and a phosphor-containing layer
Data Source
AI summary
A wavelength conversion member includes a light-reflecting member and a phosphor-containing layer. The light-reflecting member is configured to reflect laser light. The phosphor-containing layer includes a base component provided on the light-reflecting member and one or more projecting portions protruding from the base component toward a direction away from the light-reflecting member. Each of the one or more projecting portions is configured to be irradiated with laser light. Each of the one or more projecting portions is smaller than the base component and larger than a spot of the laser light to be irradiated.