UV LED White Light with Phosphor Intensity Ratios
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Solution Overview
Problem
Conventional white light emitting diodes often have a low color rendering index and high intensity blue light, which can disrupt Melatonin secretion in humans, leading to negative effects on sleep cycles and health.
Innovation Solution
A light emitting diode and lighting apparatus utilizing an ultraviolet light emitting diode in combination with blue, green, and red phosphors to produce white light with a high color rendering index and low intensity blue light, where the intensity of green and red light is 1.8 to 2.1 and 2.8 to 3.1 times that of blue light, respectively, and a peak wavelength ratio of 4:1:2:3, ensuring minimal disruption to Melatonin production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional white light emitting diodes are used, then the device structure is simple, but the color rendering index is low and blue light intensity is high which disrupts Melatonin secretion
Solution Approach 1:
The patent segments the white light generation into multiple independent components: ultraviolet LED chip, blue phosphor, green phosphor, and red phosphor. Each phosphor material is separately selected and combined to independently control the spectral composition, allowing the blue light intensity to be reduced while maintaining other wavelength components for high color rendering index and Melatonin-friendly characteristics.
2Ease of manufacture
If conventional white light emitting diodes are used, then the manufacturing process is simple, but the color rendering index is low
Solution Approach 1:
The patent employs composite phosphor materials comprising blue phosphor (peak wavelength 460-480nm), green phosphor (peak wavelength 520-545nm), and red phosphor (peak wavelength 610-650nm) in specific intensity ratios. This composite material approach enables high color rendering index (95 or more) by combining multiple phosphors with complementary spectral characteristics, while still using a straightforward ultraviolet LED excitation method.
3Illumination intensity
If high intensity blue light is emitted, then the white light appears bright, but it disrupts sleep cycles and human health
Solution Approach 1:
The patent changes the spectral parameters by controlling the intensity ratios of different phosphors relative to the ultraviolet LED excitation. Specifically, the blue phosphor intensity is limited to 1.8-2.1 times the green phosphor intensity and 2.8-3.1 times the red phosphor intensity, ensuring blue light remains below harmful thresholds while total luminous flux maintains adequate brightness for practical lighting applications.
4Productivity
If blue phosphor intensity is increased to enhance white light output, then the lighting efficiency improves, but the color rendering index deteriorates and health impacts increase
Solution Approach 1:
The patent establishes feedback control through defined intensity ratio relationships among phosphors. The blue phosphor intensity is feedback-controlled to remain within 1.8-2.1 times the green phosphor intensity and 2.8-3.1 times the red phosphor intensity, creating a self-regulating system that maintains optimal color rendering index (95 or more) and limits blue light content while maximizing overall lighting efficiency.
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 white light with a high color rendering index of 95 or more, reducing the negative impact of blue light on human health and preventing disruptions to sleep cycles while maintaining a high color rendering index.
Implementation Method 1
an ultraviolet light emitting diode emitting light in an ultraviolet wavelength region
Implementation Method 2
blue phosphors, green phosphors, and red phosphors excited by the ultraviolet light emitting diode
Data Source
AI summary
The light emitting device includes: an ultraviolet light emitting diode emitting light in an ultraviolet wavelength region; and blue phosphors, green phosphors, and red phosphors excited by the ultraviolet light emitting diode, wherein white light is formed by synthesis of the light emitted from the ultraviolet light emitting diode, light emitted from the blue phosphors, light emitted from the green phosphors, and light emitted from the red phosphors, the white light includes ultraviolet light, green light, blue light, and red light, an intensity of a peak wavelength of the green light is in a range of 1.8 to 2.1 times the intensity of a peak wavelength of the blue light, and an intensity of a peak wavelength of the red light is in a range of 2.8 to 3.1 times the intensity of the peak wavelength of the blue light.