DUV-LED UV Illumination for Plant Flavonoid Synthesis
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Solution Overview
Problem
Current greenhouse coverings block ultraviolet light, reducing the nutritional value of plants grown in protected cultivation, especially during early and late seasons when ambient UV radiation is low, and existing UV light sources like fluorescent lamps are inefficient and hazardous.
Innovation Solution
Implementing a system that uses deep ultraviolet light emitting diodes (DUV-LEDs) to create an effective ultraviolet light illumination cycle, managed by a computer system that determines ultraviolet fluorescence characteristics of plants to set target properties for optimal UV light exposure, enhancing flavonoid production and visual appearance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If greenhouse coverings are used to protect plants, then plants are protected from environmental hazards, but ultraviolet light is blocked reducing nutritional value
Solution Approach 1:
The patent introduces UV-transmissive coverings as an intermediary material that allows ultraviolet light to pass through while still providing protective enclosure. This resolves the contradiction by finding a material that performs both functions: protection and UV transmission. The covering acts as a mediator between the need for protected cultivation and the need for UV exposure to produce flavonoids.
Solution Approach 2:
The patent changes the optical parameters of the greenhouse covering to be UV-transmissive rather than UV-blocking. By selecting materials with different transmission characteristics, the system maintains protection while allowing UV light to reach plants for flavonoid synthesis. This parameter change directly addresses the contradiction between protection and nutritional quality.
2Quantity of substance
If UV-transmissive coverings are used to allow UV light through, then flavonoid production is enhanced, but benefit is reduced when ambient UV radiation is low
Solution Approach 1:
The patent applies preliminary action by providing supplemental UV lighting during periods when ambient UV radiation is insufficient. Rather than relying solely on natural UV variation, the system proactively introduces UV light sources to ensure consistent flavonoid production throughout the growing season, including early and late seasons when sunlight UV content is low.
Solution Approach 2:
The patent ensures continuity of UV exposure by combining UV-transmissive coverings with supplemental UV lighting systems. This creates a continuous or near-continuous UV environment for the plants regardless of seasonal variations in ambient UV radiation, maintaining flavonoid production consistency throughout the entire growing period rather than allowing interruptions during low-UV seasons.
3Quantity of substance
If fluorescent sun lamps are used to enhance polyphenolics, then flavonoid production increases, but efficiency is low and hazards exist
Solution Approach 1:
The patent changes the spectral parameters of the UV light source by selecting LEDs with specific peak wavelengths (282nm or 395nm) that are optimized for inducing flavonoid synthesis. This is more efficient than broad-spectrum fluorescent lamps because the LED energy is concentrated at wavelengths most effective for polyphenolic production, reducing energy waste and improving photosynthetic and UV-response efficiency.
Solution Approach 2:
The patent employs solid-state LED components that are more durable and environmentally friendly than fluorescent lamps. LEDs have longer operational lifetimes, contain no mercury, and are more resistant to breakage, making them a superior replacement despite higher initial cost. The solid-state nature provides inherent safety and reliability advantages over fragile fluorescent tubing.
4Loss of energy
If deep UV LEDs are used for UV illumination, then efficiency and safety improve, but light intensity is very dim
Solution Approach 1:
The patent merges multiple UV-LED chips or modules into arrays that collectively provide sufficient UV intensity. By combining the output of multiple individual LED elements, the system achieves both the energy efficiency and safety of LED technology while accumulating enough total light output to effectively treat plants. The merged arrays distribute UV exposure uniformly across the growth area.
Solution Approach 2:
The patent addresses the intensity limitation by transitioning from point-source LEDs to distributed array configurations. Rather than relying on a single high-intensity source, the system uses multiple lower-intensity sources arranged in two-dimensional arrays that collectively cover the entire plant canopy, providing sufficient cumulative UV exposure while maintaining LED efficiency and safety advantages.
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 results in a greater than two-fold increase in nutritionally important flavonoids like Cyanidin and Quercetin in red leaf lettuce, potentially applicable to various horticultural lighting needs, including crop growth and storage, and can be adapted for different species and genetic lines.
Implementation Method 1
deep ultraviolet light emitting diodes (DUV-LEDs)
Implementation Method 2
ultraviolet energy in the germicidal band
Implementation Method 3
absorb incident UV light and protect plant tissues from DNA damage
Implementation Method 4
determining a target property of the ultraviolet illumination using fluorescence characteristics of the organism
Data Source
AI summary
A solution for managing illumination of an organism with ultraviolet light is provided. A set of ultraviolet fluorescence characteristics of the organism can be determined using fluorescence data for the organism. The set of ultraviolet fluorescence characteristics can be used to determine a set of target properties of the ultraviolet light. The set of target properties can be used to illuminate the organism with ultraviolet light. The illumination can be managed during growth of the organism, breeding of the organism, and/or maintenance of the organism after harvest.