Phosphor Layer Chromaticity Stabilization via Dual-Phosphor Absorption
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Solution Overview
Problem
Variations in the emission peak wavelength of excitation light significantly impact the chromaticity of light emitted from wavelength conversion devices, leading to inconsistent color output in light source devices, lighting apparatuses, and projection image display systems.
Innovation Solution
Incorporating a phosphor layer with a combination of first and second phosphors on a substrate, where the chromaticity coordinates of the fluorescent light emitted by both phosphors are nearly identical and have different peak wavelengths, reducing the influence of emission peak wavelength variations on chromaticity, and ensuring the phosphors are densely packed for enhanced heat dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single phosphor type is used in the wavelength conversion device, then the device structure is simple, but the chromaticity of emitted light varies significantly with changes in excitation light peak wavelength
Solution Approach 1:
The patent combines multiple phosphors (first phosphor and second phosphor with different characteristics) into a single phosphor layer. The first phosphor has higher absorption at shorter wavelengths while the second phosphor has higher absorption at longer wavelengths, creating a complementary effect that stabilizes chromaticity across excitation wavelength variations.
Solution Approach 2:
The patent changes the absorption characteristics parameter of the phosphor layer by using phosphors with different peak absorption wavelengths. This parameter diversification allows the system to maintain stable chromaticity output despite variations in excitation light wavelength.
2Temperature
If phosphors are densely packed in the phosphor layer, then heat dissipation is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent applies different phosphors with different absorption characteristics to different regions or combinations within the phosphor layer, optimizing both heat dissipation through dense packing and manufacturing feasibility through localized material properties.
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 effectively stabilizes the chromaticity of emitted white light, reducing variations caused by changes in excitation light peak wavelength, while improving heat dissipation properties through dense phosphor packing.
Implementation Method 1
a first phosphor and a second phosphor which each emit fluorescent light when excited by excitation light
Implementation Method 2
the phosphors are densely packed for enhanced heat dissipation
Data Source
AI summary
A wavelength conversion device includes: a substrate; and a phosphor layer on the substrate. The phosphor layer includes: a base material; and a first phosphor and a second phosphor each of which emits fluorescent light when excited by excitation light. Where chromaticity coordinates of the fluorescent light emitted by the first phosphor and chromaticity coordinates of the fluorescent light emitted by the second phosphor are (x1, y1) and (x2, y2), respectively, −0.02≤x1−x2≤0.02 and −0.02≤y1−y2≤0.02 are satisfied. A peak wavelength of an excitation spectrum of the first phosphor is different from a peak wavelength of an excitation spectrum of the second phosphor.