LED Component with Fluorescent Polymer Coating for Thermal Quenching
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Solution Overview
Problem
Current LED technologies face challenges in producing high quantum efficiency broad band red/far red emission devices, particularly in achieving optimal spectral emission for light therapy and plant cultivation, due to limitations in wavelength conversion materials which are sensitive to thermal quenching and have narrow emission spectra.
Innovation Solution
The development of LED components using nano-sized semiconductor quantum dot wavelength conversion materials with broad particle size distribution and inorganic phosphor materials for partial or full wavelength conversion, along with a multi-chip LED package design that includes a metallic heat sink and strategic placement of semiconductor diodes to minimize thermal quenching, enabling broad emission peaks at red/far red wavelengths with high efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional phosphorescent materials or quantum dot nanoparticles are used for wavelength conversion, then red and far red emission can be produced, but thermal quenching occurs which reduces conversion efficiency
Solution Approach 1:
The patent uses a fluorescent polymer coating as an intermediary wavelength conversion material that absorbs blue light from the LED and emits red/far-red light. This polymer coating is applied directly to the LED chip surface, creating a thin-film converter that operates at lower temperatures compared to bulk phosphor materials, thereby reducing thermal quenching effects and maintaining higher conversion efficiency.
Solution Approach 2:
The patent changes the physical state and form of the wavelength conversion material from bulk phosphor particles or quantum dot nanoparticles to a fluorescent polymer thin film. This parameter change in material form and application method reduces the material's sensitivity to thermal quenching, allowing efficient wavelength conversion to occur even at elevated LED operating temperatures.
2Illumination intensity
If narrow bandwidth LEDs are used, then high intensity at specific wavelengths can be achieved, but the spectrum is not broad enough for optimal therapeutic and plant cultivation applications
Solution Approach 1:
The patent employs a fluorescent polymer coating with a broad emission spectrum that dynamically covers multiple wavelength regions (red and far-red) simultaneously. This broad-spectrum approach allows the system to adapt to different applications requiring different wavelength ranges, providing versatility for both therapeutic uses (600-800 nm) and plant cultivation (including far-red regions) without sacrificing peak intensity at any specific wavelength.
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 provides LED components with a broad emission spectrum at red/far red wavelengths, enhancing light energy transfer for therapeutic, photosynthetic, and photomorphogenetic applications, while maintaining high conversion efficiency and reducing thermal quenching, thus improving treatment outcomes and plant growth.
Implementation Method 1
The LED component comprises at least one light emitter and being capable of providing a light output spectrum
Implementation Method 2
nano-sized semiconductor quantum dot wavelength conversion materials with broad particle size distribution and inorganic phosphor materials for partial or full wavelength conversion
Implementation Method 3
multi-chip LED package design that includes a metallic heat sink and strategic placement of semiconductor diodes to minimize thermal quenching
Data Source
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AI summary
An LED component and the use thereof. The component comprises a light output spectrum with at least one peak intensity between 600-800 nm wavelength range with a full width at half maximum at least 50 nm; second optional optical light output peak at 200-500 nm wavelength range; and third optional output peak at 700-1000 nm wavelength range. It can be used for therapeutic, photosynthesis and photomorphogenetic applications.