Gallium-Doped Phosphor Color Wheel for High-Temperature Brightness
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Solution Overview
Problem
Existing color wheels in projectors suffer from poor luminescence intensity and a decrease in emission intensity due to increased temperature, particularly when high output is required.
Innovation Solution
A color wheel design incorporating a basic phosphor and modified phosphors doped with gallium, where the modified phosphors form a solid solution with varying gallium content, are disposed in specific areas on a substrate, and are configured to maintain optimal luminescence intensity despite temperature increases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If high output is used to improve image quality, then brightness and visibility are improved, but luminescence intensity decreases due to temperature increase
Solution Approach 1:
The patent changes the chemical composition parameters of the phosphor material by doping gallium into the Y3Al5O12 basic phosphor structure. This compositional parameter change modifies the phosphor's thermal and luminescent properties, enabling it to maintain high luminescence intensity even at elevated temperatures caused by high output operation.
Solution Approach 2:
The patent creates a composite phosphor material by combining Y3Al5O12 basic phosphor with gallium-doped modified phosphor. This composite structure leverages the complementary properties of both materials: the basic phosphor provides stable structure while the modified phosphor enhances luminescence intensity and thermal stability, resolving the contradiction between brightness and luminescence maintenance.
2Illumination intensity
If phosphor composition is optimized to improve luminescence intensity, then emission brightness is improved, but temperature sensitivity increases causing greater decrease at high temperatures
Solution Approach 1:
The patent optimizes the gallium doping concentration parameter (x in Y3(GaxAl1-x)5O12) to achieve the最佳 balance between luminescence intensity and temperature stability. By carefully controlling this compositional parameter, the phosphor maintains high emission intensity across a wide temperature range, preventing the trade-off between brightness and thermal sensitivity.
Solution Approach 2:
The patent introduces local compositional variation by creating modified phosphor regions with specific gallium doping levels adjacent to basic phosphor regions. This local quality differentiation allows different areas to contribute differently: modified phosphor areas provide enhanced luminescence and thermal stability, while basic phosphor areas provide structural foundation, together achieving both high intensity and temperature resistance.
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 design enhances luminescence intensity and reduces the decrease in emission intensity at high temperatures, improving image quality by diversifying wavelength bands and maintaining performance under increased output conditions.
Implementation Method 1
The modified phosphor forms a solid solution by substituting gallium with at least a portion of aluminum in the basic phosphor
Implementation Method 2
A color wheel is a device used in an image display device, such as a projector, and may include a phosphor that converts a wavelength of incident light and emits it
Data Source
AI summary
A color wheel according to an embodiment of the present invention comprises: a basic fluorescent body having a basic light-emitting wavelength; and at least one modified fluorescent body having at least one light-emitting wavelength different from the basic light-emitting wavelength, wherein the basic fluorescent body comprises Y3Al5O12 and the modified fluorescent body comprises Y3(GaxAl(1-x))5O12:Ce in which gallium is doped on the basic fluorescent body.