Violet-Excited Phosphor Light Emission for Sterilizing White Light
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Solution Overview
Problem
Conventional light emitting devices with blue LEDs struggle to provide sufficient emission intensity in the blue-green and red regions, compromising their color rendering properties and sterilization effectiveness, especially when used in human environments.
Innovation Solution
A light emitting device incorporating a light emitting element with a peak emission wavelength between 380 nm to 420 nm, combined with a fluorescent member excited by this element, achieving a correlated color temperature between 2000 K to 7500 K, and a spectral distribution where the violet region emission is optimized to enhance both sterilization and color rendering indices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a blue LED (450 nm peak) is used to emit white mixed color light, then high emission efficiency is achieved, but insufficient emission intensity in blue-green and red regions results in poor color rendering property
Solution Approach 1:
The patent changes the peak emission wavelength parameter of the LED from conventional 450 nm (blue) to 380-420 nm (violet), and adjusts the correlated color temperature parameter to 2000-7500 K. This parameter change enables the LED to provide sufficient emission intensity in blue-green and red regions while maintaining high emission efficiency, thereby resolving the color rendering problem.
2Object-affected harmful factors
If violet region light (380-420 nm) is used for sterilization, then safe sterilization effect is achieved, but large emission intensity in violet region compromises color rendering property
Solution Approach 1:
The patent optimizes the correlated color temperature parameter to 2000-7500 K and adjusts the spectral distribution to ensure the proportion of 380-420 nm light is 15% or more while maintaining balanced emission across the visible spectrum. This resolves the contradiction by achieving both effective sterilization and good color rendering property simultaneously.
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 achieves a high-quality color rendering property and sterilization effect by balancing the emission spectrum, ensuring improved visibility and germicidal efficacy in human visual environments.
Implementation Method 1
a fluorescent member including at least one fluorescent material that is excited by light from the light emitting element for light emission
Data Source
AI summary
A light emitting device includes a light emitting element having an emission peak wavelength in a range of 380 nm to 420 nm and a fluorescent member including at least one fluorescent material that is excited by light from the light emitting element for light emission, wherein a mixture of light from the light emitting element and light from the fluorescent material has a correlated color temperature in a range of 2000 K to 7500 K as measured according to JIS Z8725, and the light emitting device has a spectral distribution in which, when the integral value over a wavelength range of 380 nm to 780 nm is normalized to 100%, the proportion of an integral value over a wavelength range of 380 nm to 420 nm is 15% or more, and the ratio a as defined by the expression (1) is 0.9 or more and 1.6 or less.