Wavelength Conversion Element Diffuser Particle Design
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Solution Overview
Problem
Conventional wavelength conversion elements face challenges in enhancing heat conductivity to cool fluorescent bodies effectively and improving fluorescent light extraction efficiency due to issues with heat radiation and separation of inorganic oxide particles from the fluorescent body, leading to low luminance effects in light source apparatuses.
Innovation Solution
A wavelength conversion element with a fluorescent body, a binder, and multiple diffuser particles, where the minimum particle diameter of the diffuser particles is ¼ to 4 times the wavelength of the fluorescent light, and the volume ratio of diffuser particles to the total volume of the binder and diffuser particles is 25% to 50%, enhancing fluorescent light extraction efficiency through an optical tunneling effect.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If high heat conductivity fillers are added to the fluorescent body and resin, then heat radiation capability is improved, but the resin encloses the fillers making it difficult to provide effective cooling effect
Solution Approach 1:
The patent extracts the high heat conductivity fillers from the resin matrix and applies them directly to the fluorescent body surface. This separation allows the fillers to be positioned where they can effectively conduct heat away from the fluorescent body without being enclosed by the resin, thereby resolving the contradiction between heat radiation capability and actual cooling effectiveness.
Solution Approach 2:
The patent introduces a binder as an intermediary material that adheres the high heat conductivity fillers to the fluorescent body. This binder mediates between the fluorescent body and the fillers, ensuring proper adhesion and positioning while allowing the fillers to maintain direct thermal contact with the fluorescent body for effective heat conduction.
2Illumination intensity
If inorganic oxide particles are adhered to fluorescent body particles, then fluorescent light extraction efficiency is improved in principle, but particles separate during mixing process leading to low luminance effect
Solution Approach 1:
The patent applies inorganic oxide particles to the fluorescent body particles before the mixing and curing process. This preliminary application ensures that the particles are properly positioned on the fluorescent body surface before any separation can occur during subsequent processing, thereby maintaining both light extraction efficiency and compositional stability.
Solution Approach 2:
The patent uses a binder as an intermediary material that securely adheres the inorganic oxide particles to the fluorescent body particles. This binder provides strong adhesion that prevents particle separation during the mixing process while allowing the optical properties to be maintained, thus resolving the contradiction between light extraction efficiency and compositional stability.
3Illumination intensity
If inorganic oxide particles are adhered to fluorescent body particles, then fluorescent light extraction efficiency is improved, but air bubbles are caught between particles reducing luminance effect
Solution Approach 1:
The patent removes air bubbles from the particle mixture by applying the inorganic oxide particles to the fluorescent body particles in a controlled manner before mixing. This extraction of air bubbles prevents them from being trapped between particles during the mixing process, thereby maintaining both high light extraction efficiency and minimal energy loss.
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 proposed solution significantly improves fluorescent light extraction efficiency, resulting in higher luminance and brighter image projection capabilities compared to conventional systems.
Implementation Method 1
enhancing fluorescent light extraction efficiency through an optical tunneling effect
Implementation Method 2
convert a wavelength of an exciting light to generate a fluorescent light
Implementation Method 3
convert a wavelength of an exciting light to generate a fluorescent light
Data Source
AI summary
The wavelength conversion element converts a wavelength of part of an exciting light to generate a fluorescent light and thereby generate a combined light in which the fluorescent light is combined with a non-converted light whose wavelength is the same as that of the exciting light. The element includes a fluorescent body, a binder contacting the fluorescent body, and multiple diffuser particles included in the binder. A minimum particle diameter of the multiple diffuser particles is ¼ or more and 4 times or less of a wavelength of the fluorescent light, and a ratio of a volume of the multiple diffuser particles to a total volume of the binder and multiple diffuser particles is 25% or more and 50% or less.