Wavelength Conversion Element Phosphor Layer Optimization
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Solution Overview
Problem
Existing light source devices with phosphor layers struggle to maintain high light emission efficiency across their entire range due to the optimal balance between phosphor thickness and volume concentration, leading to inefficiencies in excitation light conversion.
Innovation Solution
A wavelength conversion element with a phosphor layer where the thickness of the phosphor region, calculated by multiplying the phosphor layer thickness by the volume concentration of phosphors, is optimized to be between 15 μm and 60 μm, ensuring high light emission efficiency by balancing excitation light conversion and minimizing absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the amount of phosphors in the phosphor layer is increased, then the conversion of excitation light to fluorescent light is improved, but the light emission efficiency decreases due to excessive absorption of fluorescent light by phosphors
Solution Approach 1:
The patent applies parameter changes by optimizing the thickness of the phosphor layer and the volume concentration of phosphors to achieve the optimal balance. Specifically, the phosphor layer thickness is controlled within 1-100 μm and the volume concentration is controlled within 10-80 vol%, which resolves the contradiction between sufficient light conversion and excessive absorption.
2Productivity
If the thickness of the phosphor layer is increased, then the light conversion capability is improved, but the light emission efficiency decreases due to increased absorption of fluorescent light
Solution Approach 1:
The patent optimizes the thickness parameter of the phosphor layer to be within 1-100 μm, which allows sufficient light conversion while preventing excessive absorption. This parameter optimization resolves the contradiction between productivity and energy efficiency.
3Use of energy by moving object
If the volume concentration of phosphors is increased, then the excitation light conversion is improved, but the light emission efficiency decreases due to increased self-absorption
Solution Approach 1:
The patent optimizes the volume concentration of phosphors to be within 10-80 vol%, which ensures sufficient excitation light conversion while minimizing self-absorption losses. This parameter change resolves the contradiction between conversion efficiency and energy loss.
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 configuration achieves high light emission efficiency by preventing excessive absorption and ensuring adequate excitation light conversion, resulting in a reliable and efficient light source device for projectors.
Implementation Method 1
a phosphor layer excited by laser light, which is emitted from the laser light source, to emit fluorescent light
Data Source
AI summary
A wavelength conversion element includes a phosphor layer that includes phosphors and a binder. The thickness of a phosphor region obtained by multiplying the thickness of the phosphor layer by the volume concentration of the phosphor is equal to or larger than 15 μm.