Wavelength Conversion Materials for High-Luminance Monochromatic Light
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Solution Overview
Problem
Existing methods for generating monochromatic light using wavelength conversion materials suffer from low brightness due to technical limitations, which hinder their application in high brightness monochromatic light generation.
Innovation Solution
The method involves mixing two wavelength conversion materials, where the first converted light is divided into effective and non-effective regions, with the second material absorbing the non-effective region to enhance brightness, and using dichroic elements to filter and separate spectral parts, resulting in high brightness monochromatic light with improved color purity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If monochromatic phosphor is directly excited to generate monochromatic light, then color purity is maintained, but brightness is insufficient
Solution Approach 1:
The patent combines multiple wavelength conversion materials (first and second wavelength conversion materials) in a single lighting device to generate monochromatic light. The first wavelength conversion material converts excitation light to a first converted light, while the second wavelength conversion material converts the same excitation light to a second converted light. By merging these two conversion pathways, the system achieves higher brightness while maintaining color purity through the synergistic effect of multiple materials working together.
Solution Approach 2:
The patent employs composite wavelength conversion materials consisting of multiple phosphors or light-emitting substances with different conversion characteristics. The first and second wavelength conversion materials are composed of different phosphor particles or dye molecules that have complementary absorption and emission spectra. This composite approach allows the system to leverage the advantages of each material while mitigating their individual limitations, resulting in high brightness and pure color output.
2Productivity
If phosphor mixture is used to generate white light, then high efficiency is achieved, but this technology cannot be applied to high brightness monochromatic light generation due to technical limitations
Solution Approach 1:
The patent segments the wavelength conversion process into two distinct but coordinated stages: first wavelength conversion material and second wavelength conversion material. Each material is specifically selected and positioned to handle particular portions of the spectrum. The first material handles the initial conversion from excitation light, while the second material performs a secondary conversion to achieve the final monochromatic output. This segmentation allows optimization for both efficiency and monochromatic purity.
Solution Approach 2:
The patent applies local quality by assigning specific functional roles to different wavelength conversion materials based on their spectral characteristics. The first wavelength conversion material is positioned to receive excitation light and convert it to a specific wavelength range, while the second wavelength conversion material is positioned to receive the first converted light and convert it to the final monochromatic wavelength. This localized functional assignment ensures that each material operates in its optimal performance range, achieving high efficiency while maintaining monochromatic purity.
3Illumination intensity
If red phosphor is used to generate red light, then color purity is maintained, but brightness is limited compared to mixing approaches
Solution Approach 1:
The patent merges the functionality of multiple wavelength conversion materials into a single integrated lighting device structure. The first and second wavelength conversion materials are positioned in close proximity to the excitation light source, allowing both materials to be excited simultaneously by the same light source. This merging approach eliminates the need for separate excitation systems and simplifies the overall device structure while achieving high brightness through the combined output of multiple materials.
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 approach increases the brightness of monochromatic light while maintaining color purity, achieving better lighting efficiency and stability compared to direct excitation methods, with the light power of the second converted light being greater than 40% and less than 80% of the total output.
Implementation Method 1
using an excitation light to excite the first wavelength conversion material and the second wavelength conversion material, wherein the first wavelength conversion material absorbs the exciting light and emits the first converted light
Implementation Method 2
the second wavelength conversion material absorbs a first spectral part of the first converted light and emits the second converted light
Implementation Method 3
a fourth dichroic element is located between the first wavelength conversion material and the second wavelength material which transmits the first converted light and reflects or partially reflects the second converted light
Data Source
AI summary
Disclosed is a method for producing a high-luminance monochromatic light based on optical wavelength conversion, which is used in a light source comprising an excitation light source, and comprises the steps of: setting a first wavelength conversion material and a second wavelength conversion material; using an excitation beam to excite the first wavelength conversion material and the second wavelength conversion material, wherein the first wavelength conversion material absorbs the excitation light to produce a first excited light; the second wavelength conversion material absorbs a first waveband portion of the first excited light to produce a second excited light, where the energy of the absorbed first waveband portion is more than 50% of the total energy of the first excited light; mixing the second excited light and the unabsorbed portion of the first excited light together to form the high-luminance monochromatic light.