Solid-State Light Source Device With Segmented Phosphors
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Solution Overview
Problem
Conventional solid-state light source devices experience reduced luminous efficiency due to wavelength-converted light being reabsorbed in other phosphors, which limits the output of high-luminance white light.
Innovation Solution
The device employs a semiconductor light emitting element with separate first and second light emitters and wavelength converters, each containing distinct phosphors, disposed apart to prevent excitation light from being absorbed by the wrong phosphor, thereby enhancing luminous efficiency by ensuring that wavelength-converted light is not reabsorbed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If stacked layers containing multiple phosphors are used for wavelength conversion, then white light can be generated, but luminous efficiency decreases due to reabsorption of converted light
Solution Approach 1:
The patent divides the wavelength conversion function into separate modules by using multiple semiconductor light emitting elements, each paired with its own wavelength converter containing a specific phosphor. This segmentation prevents reabsorption of converted light by other phosphors, thereby maintaining high luminous efficiency while generating white light.
2Adaptability or versatility
If multiple phosphors are stacked in layers, then broad spectrum white light is achieved, but reabsorption occurs reducing overall efficiency
Solution Approach 1:
The patent segments the wavelength conversion system into independent units, each handling a specific wavelength range. By using multiple semiconductor light emitting elements with different wavelengths, each driving its own phosphor converter, the system achieves broad spectrum coverage without the reabsorption losses inherent in stacked layer configurations.
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 results in high luminous efficiency white light emission by preventing reabsorption, allowing for efficient conversion and output of white light with improved luminance and reduced heat-related degradation.
Implementation Method 1
The first phosphor converts the first excitation light into first-wavelength light
Implementation Method 2
the second phosphor converts the second excitation light into second-wavelength light
Data Source
AI summary
A solid-state light source device is equipped with a semiconductor light emitting element and a wavelength conversion element. The semiconductor light emitting element has a first light emitter and a second light emitter. The wavelength conversion element has a first wavelength converter containing a first phosphor and has a second wavelength converter containing a second phosphor. The first wavelength converter and the second wavelength converter are disposed apart from each other. The first light emitter emits first excitation light, and the second light emitter emits second excitation light. The first phosphor converts the first excitation light into first-wavelength light, and the second phosphor converts the second excitation light into second-wavelength light.