Phosphor Wheel with Spatially Separated Phosphors
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Solution Overview
Problem
Existing phosphor arrangements for converting pump light to conversion light lack flexibility and efficiency, particularly in terms of color rendering and phosphor lifespan, as they often require a single type of phosphor for all applications.
Innovation Solution
A phosphor wheel with spatially separated first and second phosphors of the same hue, allowing for selective use based on requirements, such as high color saturation or high efficiency, and enabling proportional illumination to optimize energy consumption and lifespan.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single type of phosphor is used for all applications, then the device structure is simple, but the flexibility and efficiency for different color rendering requirements are limited
Solution Approach 1:
The phosphor arrangement is segmented into multiple spatially separated phosphors (first phosphor and second phosphor) on the phosphor wheel, each optimized for different color rendering requirements. This allows selective use of different phosphors based on application needs, resolving the contradiction between versatility and structural simplicity.
Solution Approach 2:
The phosphor wheel is designed to rotate, enabling dynamic selection between different phosphors during operation. The rotation mechanism allows the system to switch between first and second phosphors based on illumination requirements, providing flexibility without requiring multiple separate static systems.
2Reliability
If a single phosphor type is used, then the manufacturing process is simple, but the ability to optimize for both color saturation and efficiency is compromised
Solution Approach 1:
Different regions of the phosphor wheel are assigned different phosphor types with locally optimized properties. The first phosphor is optimized for color saturation while the second phosphor is optimized for efficiency and lifespan. This local differentiation allows each phosphor to excel in its specific function while maintaining a unified wheel structure for manufacturing.
3Productivity
If the entire phosphor wheel is illuminated, then all phosphors are utilized, but the ability to selectively use specific phosphors for specific needs is lost
Solution Approach 1:
The system employs periodic illumination synchronized with the rotation of the phosphor wheel. By controlling the illumination timing and duration, specific phosphors can be selectively activated during specific rotation phases, enabling versatile phosphor selection while maintaining continuous light output through the rotation cycle.
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 phosphor wheel allows for situation-dependent selection of phosphors for improved color rendering and extended lifespan, reducing energy consumption by using the most suitable phosphor for specific illumination needs.
Implementation Method 1
a first phosphor for converting pump light to conversion light of a first color and a second phosphor for converting pump light to conversion light of a second color
Data Source
AI summary
A phosphor wheel for converting pump light to conversion light, on which a first phosphor for emitting conversion light of a first color and a second phosphor for emitting conversion light of a second color are provided. The light of first and second phosphors, which are arranged in a manner spatially separated from one another on the phosphor wheel, has the same hue in this case. Depending on the requirement, either the first or the second phosphor can thus be selected.