Light Emitting Device Red Fluorescent Material Spectral Balance
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Solution Overview
Problem
Existing light emitting devices that supplement red light using a fluorescent material with an existing white light source often disrupt the spectral balance, leading to a decrease in green and yellow to orange light, which hampers plant growth and nutrient component enhancement.
Innovation Solution
A light emitting device comprising a light emitting element with a peak wavelength in the near-ultraviolet to blue region and a red fluorescent material that emits light in the 580-680 nm range, maintaining a photon flux ratio of red to blue light between 20 and 200, ensuring efficient red light supplementation without compromising the spectral balance of the existing light source.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a fluorescent material is used to supplement red light with an existing white light source, then red light supplementation is achieved, but the spectral balance of the existing light source is lost and green and yellow to orange light decrease
Solution Approach 1:
The patent applies parameter changes by precisely controlling the emission peak wavelength of the blue light emitting element (380-490 nm) and the red fluorescent material (580-680 nm), along with controlling the photon flux ratio (R/B between 20-200). This parametric control enables red light supplementation while maintaining the spectral balance of the white light source, preventing the loss of green and yellow-orange light components that occurs with conventional approaches.
2Illumination intensity
If red light is supplemented using conventional light emitting devices, then red light intensity increases, but energy consumption increases
Solution Approach 1:
The patent replaces conventional mechanical/electrical light generation methods with a fluorescent conversion mechanism. A blue light emitting element (LED) excites the red fluorescent material, which then emits red light. This fluorescent conversion approach is more energy-efficient than using separate red LED chips or other conventional red light sources, as it converts blue light energy to red light with minimal energy loss, thereby reducing overall energy consumption while achieving the required red light intensity for plant growth.
3Productivity
If red light supplementation is implemented, then plant growth promotion is enhanced, but capital investment increases
Solution Approach 1:
The patent merges the blue light emitting element and the red fluorescent material into a single integrated light emitting device. This combination allows the device to simultaneously provide both blue light (from the LED) and red light (from the fluorescent conversion), creating a complete spectrum for plant photosynthesis and photomorphogenesis. This merged design eliminates the need for separate red and blue light sources, reducing system complexity and capital investment while enhancing plant growth efficiency through optimized spectral composition.
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 effective red light supplementation for plant growth while preserving the spectral balance of the existing light source, promoting plant growth and enhancing functional nutrient components without excessive energy consumption or capital investment.
Implementation Method 1
a red fluorescent material which is excited by the light from the light emitting element to emit light having at least one light emission peak wavelength in a range of 580 nm or more and 680 nm or less
Implementation Method 2
In the case of photosynthesis reaction, chlorophyll a, chlorophyll b and carotenoid capture light as an energy
Implementation Method 3
In the case of photomorphogenesis, phytochrome, cryptochrome and phototropin receive light as a signal
Data Source
AI summary
A light emitting device includes a light emitting element having an emission peak wavelength in a range of 380 nm or more and 490 nm or less, and a red fluorescent material which is excited by the light from the light emitting element to emit light having at least one light emission peak wavelength in a range of 580 nm or more and 680 nm or less, wherein a ratio of the photon flux R of red light in a range of 620 nm or more and 700 nm or less to the photon flux B of blue light in a range of 400 nm or more and 490 nm or less, R/B, is in a range of more than 20 and 200 or less.