Phosphor-Converted LED Spectrum Tuning for Golden Light Rendering
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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 with a semiconductor light emitting element emitting excitation light in the 440-450 nm range and 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 module with multiple devices emitting light in different chromaticity regions to achieve golden light with high color rendering.
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 in high external light environments deteriorate
Solution Approach 1:
The patent changes the spectral parameters by selecting specific fluorescent bodies with defined peak wavelengths (540-575nm for first fluorescent body, 590-605nm for second fluorescent body) and controlling their intensity ratios (1/10 to 1/60), thereby achieving golden light emission with improved color rendering properties while maintaining energy efficiency
Solution Approach 2:
The patent uses a composite fluorescent body layer containing two different fluorescent bodies with distinct emission characteristics. This composite structure combines the advantages of different fluorescent materials to produce the desired golden light spectrum that maintains both energy efficiency and color rendering performance
2Device complexity
If conventional LED designs are used, then device simplicity is maintained, but ability to emit visually recognizable golden light deteriorates
Solution Approach 1:
The patent achieves golden light emission by changing the spectral parameters through selective fluorescent body combination rather than complicating the device structure. The specific wavelength ranges and intensity ratios enable visual recognition of golden light while maintaining relatively simple LED device architecture
3Ease of manufacture
If conventional fluorescent body combinations are used, then manufacturing simplicity is maintained, but color rendering for golden light deteriorates
Solution Approach 1:
The patent specifies particular wavelength parameters (first fluorescent body: 540-575nm, second fluorescent body: 590-605nm, intensity ratio: 1/10 to 1/60) that can be controlled during manufacturing through fluorescent body selection and concentration adjustment, achieving golden light color rendering without significantly complicating the manufacturing process
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 various light environments, including natural light, and when reflected from objects, with improved color rendering properties by adjusting the intensity and ratio of fluorescent bodies to absorb blue-green light, enhancing the perceived golden color.
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
AI summary
A light emitting device includes a semiconductor light emitting element which emits excitation light having a peak wavelength in a range of 440 to 450 nm 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. 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, 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.