Violet-LED White Lighting for Disinfection With Low Blue Content
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Solution Overview
Problem
Current light-emitting devices that aim to provide white light for general illumination struggle to balance high luminous efficacy with desirable color characteristics and additional functions such as microorganism inactivation, often requiring complex combinations of light emitters and converters.
Innovation Solution
A light-emitting device comprising a light emitter and a light-converting material that converts a portion of the emitted light in the 380 nm to 420 nm range to produce a combined white light with a significant proportion of spectral energy in this range, utilizing optical brighteners or phosphors to achieve the desired color properties and disinfection capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If blue light-emitting semiconductors are used with phosphor materials to achieve high luminous efficacy, then illumination efficiency is improved, but blue light content increases causing melatonin suppression
Solution Approach 1:
The patent changes the spectral parameters by using violet light-emitting semiconductors (380-420 nm) instead of blue light-emitting semiconductors (430-480 nm), and by adjusting phosphor material composition ratios to reduce blue light content while maintaining luminous efficacy and adding microorganism inactivation capability
Solution Approach 2:
The lighting device achieves multiple functions simultaneously: general illumination, microorganism inactivation, and reduced melatonin suppression by eliminating blue light while using violet light with appropriate phosphor conversion
2Object-affected harmful factors
If violet LEDs are used to reduce blue light content, then melatonin suppression is reduced, but luminous efficacy and cost performance deteriorate
Solution Approach 1:
The patent uses composite phosphor materials including red, green, and blue phosphors in specific ratios combined with violet light-emitting semiconductors to achieve high luminous efficacy while maintaining reduced blue light content and adding disinfection functionality
3Illumination intensity
If multiple light emitters and converters are combined to achieve white light with additional functions, then color characteristics and illumination quality are improved, but device complexity increases
Solution Approach 1:
The patent merges multiple functions (illumination, disinfection, circadian rhythm regulation) into a single lighting device by using violet light-emitting semiconductors with multi-component phosphor materials, eliminating the need for separate blue light sources and reducing overall system complexity
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 device effectively emits white light with high color rendering index and correlated color temperature while inactivating microorganisms, such as bacteria and fungi, with minimal blue light content to reduce melatonin suppression, thus providing efficient and safe illumination.
Implementation Method 1
utilizing optical brighteners or phosphors to achieve the desired color properties
Implementation Method 2
utilizing optical brighteners or phosphors to achieve the desired color properties
Implementation Method 3
a light-emitting device capable of emitting light that can be perceived as white or a hue of white while simultaneously causing the inactivation of microorganisms
Data Source
AI summary
A surface light emitting device that inactivates microorganisms may include at least one light emitter configured to emit a first light comprising a first peak wavelength wherein the first light is a blue light, and a light converting layer disposed over the at least one light emitter. The light converting layer may include a first light-converting material configured to convert only a first portion of the first light to at least a second light comprising a second peak wavelength different from the first peak wavelength, a second light-converting material configured to convert only a second portion of the first light to at least a third light comprising a third peak wavelength different from the first peak wavelength and the second peak wavelength.