Phosphor-Converted LED Module for Clear Golden Light Emission
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Solution Overview
Problem
Semiconductor light emitting devices, such as LEDs, are not designed to effectively produce golden light with high color rendering properties, especially in environments with high external light intensity like natural daylight, and lack solutions for emitting golden light that is visually recognized as gold.
Innovation Solution
A semiconductor light emitting device comprising a semiconductor light emitting element emitting excitation light in the 440-450 nm range, combined with a fluorescent body layer containing a first fluorescent body emitting light in the 540-575 nm range and a second fluorescent body emitting light in the 590-605 nm range, where the intensity of the semiconductor light emitting element's radiation is 1/10 to 1/60 of the combined light from both fluorescent bodies, and a semiconductor light emitting module with varying ratios of fluorescent bodies to achieve different chromaticity regions for enhanced golden light emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional LED light sources are used for lighting, then energy efficiency is improved, but color rendering properties for golden light are deteriorated
Solution Approach 1:
The patent uses a composite fluorescent body layer containing multiple types of fluorescent bodies (first fluorescent body with 540-575 nm emission, second fluorescent body with 575-605 nm emission) combined with a blue LED excitation source (440-450 nm). This composite structure enables the generation of golden light with excellent color rendering properties while maintaining the energy efficiency of LED technology.
Solution Approach 2:
The patent optimizes specific parameters including the emission peak wavelengths of fluorescent bodies (540-575 nm for first fluorescent body, 575-605 nm for second fluorescent body), the excitation wavelength (440-450 nm blue LED), and the intensity ratio (excitation light intensity set to 1/10 to 1/60 of combined fluorescent light intensity). These parameter changes enable precise control over the spectral characteristics to achieve golden light with high color rendering.
2Illumination intensity
If light sources are designed for nighttime use, then illumination effectiveness is improved, but color rendering in daytime external light environments is deteriorated
Solution Approach 1:
The patent changes the spectral parameters by using a blue LED excitation source (440-450 nm) combined with specific fluorescent bodies that emit in the 540-605 nm range, creating golden light with high excitation purity. This parameter optimization ensures that the light maintains its golden color characteristics even when viewed in the presence of natural daylight, solving the problem of poor color rendering in daytime environments.
Solution Approach 2:
The patent specifically targets color rendering by adjusting the emission spectrum to produce golden light with peak wavelengths in the 540-605 nm range. The color temperature and excitation purity are optimized to ensure that objects illuminated by this light source appear with accurate golden coloration, whether viewed directly or reflected, even in the presence of external natural light.
3Device complexity
If simple fluorescent body combinations are used, then device complexity is reduced, but ability to emit visually recognizable golden light is deteriorated
Solution Approach 1:
The patent employs a composite fluorescent body layer with two specific types of fluorescent bodies having distinct emission characteristics (first fluorescent body: 540-575 nm, second fluorescent body: 575-605 nm). This composite approach achieves visually recognizable golden light with high color rendering properties without requiring overly complex device structures, maintaining a balance between simplicity and performance.
Solution Approach 2:
The patent optimizes key parameters including the emission peak ranges of the fluorescent bodies (540-575 nm and 575-605 nm), the excitation light intensity ratio (1/10 to 1/60 of combined fluorescent light), and the fluorescent body layer thickness. These parameter optimizations enable the generation of golden light that is clearly visually recognizable while keeping the device structure relatively simple.
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 solution enables the production of golden light that is visually recognized as gold in both external light environments and when reflected from objects, with improved color rendering properties and excitation purity, effectively addressing the limitations of existing technologies.
Implementation Method 1
a semiconductor light emitting element which emits excitation light having a peak wavelength in a range of 440 to 450 nm
Implementation Method 2
a fluorescent body layer which is provided on the semiconductor light emitting element and contains a first fluorescent body and a second fluorescent body that emit first fluorescent light and second fluorescent light, respectively, by the excitation light from the semiconductor light emitting element
Data Source
Figure 1A~1B
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AI summary
Provided are a semiconductor light emitting device and a semiconductor light emitting module which emit golden light that is visually recognized clearly as a golden color even in an outdoor light environment or golden light that is visually recognized clearly as a gold color when light is irradiated to an object and reflected from the object. The present invention has: a semiconductor light emitting element which emits excitation light having a peak wavelength in a range of 440 to 450nm; and a fluorescent body layer which is provided on the semiconductor light emitting element, is excited by the excitation light from the semiconductor light emitting element, and contains a first fluorescent body and a second fluorescent body which emit first fluorescent light and second fluorescent light, respectively. The first fluorescent light has a peak wavelength in a range of 540 to 575 nm, and the second fluorescent light has a peak wavelength in a range of 590 to 605 nm. In mixed color light of the radiation light which is emitted from the fluorescent body layer and which combines the radiation light of the semiconductor light emitting element, the radiation light of the first fluorescent body and the radiation light from the second fluorescent body, which is emitted from the fluorescent body layer, the intensity of the radiation light of the semiconductor light emitting element is 1/10 to 1/60 of the intensity of the combined light of the radiation light from the first fluorescent body and the second fluorescent body.