Reflective Nanofiber Lighting for Broad-Spectrum White Light
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Solution Overview
Problem
Current solid-state lighting (SSL) technologies face challenges in producing high-intensity white light with a broad emission cone suitable for general illumination, as existing solutions often result in poor spectral quality and energy inefficiency, and previous methods using quantum dots or nanofibers have limitations in size and placement that affect light conversion efficiency.
Innovation Solution
A fiber-based reflective lighting device utilizing nanocomposite mats with reflective fibers less than 1,000 nm in diameter, coated with a reflectance-enhancing material, which diffusively reflects visible light and increases reflectance, combined with photoluminescent nanofibers to convert primary light into white light, enhancing light output and energy efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional fluorescent lighting is used, then energy efficiency is improved, but spectral quality deteriorates
Solution Approach 1:
The patent uses a composite structure combining a blue LED chip with a yellow phosphor coating (YAG:Ce) to create a white light source that maintains high energy efficiency while achieving excellent spectral quality. The phosphor converts a portion of the blue LED light to yellow, creating a broad spectrum that closely resembles natural sunlight
Solution Approach 2:
The patent adjusts the phosphor particle size to the nanoscale (50-500 nm) and controls the phosphor concentration and distribution within the epoxy matrix to optimize both the energy efficiency and spectral quality of the white light output
2Ease of manufacture
If conventional SSL with large phosphor particles is used, then manufacturing is simplified, but light conversion efficiency deteriorates
Solution Approach 1:
The patent changes the particle size parameter of the phosphor from conventional large particles (>2 μm) to nanoscale particles (50-500 nm). This size reduction increases the surface area to volume ratio, improving light absorption and conversion efficiency while maintaining ease of incorporation into the epoxy matrix through standard mixing processes
Solution Approach 2:
The patent creates local variations in phosphor concentration and particle size distribution within the epoxy matrix to optimize light conversion at different locations. The nanoscale phosphor particles are distributed throughout the matrix to ensure uniform light conversion across the entire LED package
3Illumination intensity
If quantum dots are used for light conversion, then spectral quality is improved, but device complexity increases
Solution Approach 1:
The patent extracts the light conversion function from complex quantum dot structures and implements it using simpler nanoscale phosphor particles embedded in an epoxy matrix. This maintains the spectral quality benefits of nanoscale light conversion while eliminating the need for complex quantum dot synthesis and integration processes
Solution Approach 2:
The patent changes the material composition parameter from quantum dots to phosphor materials, and adjusts the particle size to the nanoscale range. This achieves comparable spectral quality to quantum dots while using more成熟 and easier-to-manufacture phosphor materials that can be directly mixed into the epoxy
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 achieves high diffuse reflectance values, increasing optical power output by minimizing light absorption and providing a broad spectrum of white light with improved color rendering indices and energy efficiency, suitable for general illumination applications.
Implementation Method 1
a reflectance-enhancing coating conformally disposed around an outer surface of the fibers, having a refractive index different from the reflective fibers, and which increases a reflectance of the substrate in the visible spectrum
Implementation Method 2
a substrate having a nanocomposite mat of reflective fibers having diameters less than 1,000 nm, which diffusively reflects visible light upon illumination
Implementation Method 3
combined with photoluminescent nanofibers to convert primary light into white light
Data Source
AI summary
A fiber-based reflective lighting device and a housed lighting device. The fiber-based reflective lighting device which includes a source configured to generate a primary light, and a substrate having a nanocomposite mat of reflective fibers having a diameter less than 1,000 nm which diffusively reflects light upon illumination with at least the primary light. The nanocomposite mat includes a reflectance-enhancing coating conformally disposed around an outer surface of the fibers, having a refractive index different from the reflective fibers, and which increases a reflectance of the substrate in the visible spectrum. The lighting device includes a light exit configured to emanate the reflected light. The housed lighting device includes a housing, a source configured to generate primary light and direct the primary light into the housing, the reflective nanocomposite mat of reflective fibers, and a light exit in the housing configured to emanate the reflected light from the housing.