Ceramic Composite Phosphor for Projectors Resolving Heat and Efficiency
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Solution Overview
Problem
Existing projector light sources using glass-based phosphor layers with low thermal conductivity suffer from inadequate heat radiation, leading to reduced light emission efficiency and conversion efficiency due to low phosphor content.
Innovation Solution
A ceramic composite containing a high volume percentage of YAG:Ce or BAl5O12 phosphor phase and a translucent ceramic scatterer phase, with specific particle size and content ratios, enhances light emission efficiency by efficiently converting blue light to yellow light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If glass-based phosphor layer with low thermal conductivity is used, then manufacturing is easier and material cost is lower, but heat radiation is inadequate and light emission efficiency deteriorates
Solution Approach 1:
The patent uses a composite material structure consisting of phosphor particles dispersed in a transparent resin matrix. This composite approach allows the system to achieve both good manufacturability and adequate heat radiation properties, resolving the contradiction between ease of manufacture and light emission efficiency.
2Temperature
If phosphor content is kept low (at most 80%), then heat radiation is improved, but excitation light absorption is insufficient and conversion efficiency deteriorates
Solution Approach 1:
The patent optimizes the phosphor content parameter to a specific range (5-80 vol%) and controls particle size parameters (0.1-10 μm) to achieve the best balance between heat radiation and light conversion efficiency. This parameter optimization resolves the contradiction by finding the optimal point where both requirements are satisfied.
3Loss of energy
If phosphor content is increased to improve conversion efficiency, then light absorption is improved, but heat radiation capability is reduced
Solution Approach 1:
The patent creates local heterogeneity in the phosphor layer by using particles of different sizes distributed within the transparent resin matrix. This local quality variation allows different regions to serve different functions: larger particles for light absorption and smaller particles for heat radiation, resolving the contradiction between conversion efficiency and heat radiation capability.
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 ceramic composite significantly improves light emission efficiency and mechanical strength while maintaining high phosphor content, effectively addressing heat radiation and conversion efficiency issues.
Implementation Method 1
a phosphor phase including YAG containing Ce or BAl5O12 containing Ce... When irradiated with blue light, can convert the wavelength efficiently
Implementation Method 2
a scatterer phase including a translucent ceramic... excellent in light emission efficiency
Data Source
AI summary
A ceramic composite contains inorganic materials and includes a phosphor phase including YAG containing Ce, and a scatterer phase including a translucent ceramic, in which the phosphor phase is contained in an amount of 90 vol % or more and 99 vol % or less, and the scatterer phase is contained in an amount of 1 vol % or more and 10 vol % or less.