LED Blue Sky Light Source with Phosphor Coating for Low-Profile Lamps
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Solution Overview
Problem
Existing blue sky lamps require a special lens to achieve a blue sky effect, increasing lamp height and cost, limiting their applicability and aesthetics.
Innovation Solution
A cyan blue light source using an LED chip with a peak wavelength range of 460-485 nm, covered by a Sr2SiO4:Eu phosphor layer, and a transparent isolation protection layer, integrated into a lamp design without needing a special lens, allowing for reduced volume and cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a special lens is used to achieve the blue sky effect, then the blue sky effect is improved, but the lamp height increases and cost increases
Solution Approach 1:
The patent extracts the special lens component from the system and replaces it with a LED chip having a specific peak wavelength (460-485nm) combined with a Sr2SiO4:Eu phosphor layer. This extraction eliminates the need for the special lens while maintaining the blue sky effect, thereby reducing lamp height and cost.
Solution Approach 2:
The patent changes the key parameter of the light source from using a conventional LED with a special lens to using an LED chip with a specific peak wavelength range (460-485nm) combined with a Sr2SiO4:Eu phosphor layer. This parameter change achieves the blue sky effect without requiring the special lens, thus reducing lamp height and cost.
2Illumination intensity
If a special lens is used to achieve the blue sky effect, then the blue sky effect is improved, but the cost increases
Solution Approach 1:
The patent extracts the expensive special lens component from the system and replaces it with a more cost-effective LED chip with specific wavelength characteristics combined with a Sr2SiO4:Eu phosphor layer. This extraction reduces manufacturing cost while maintaining the blue sky effect.
Solution Approach 2:
The patent replaces the expensive special lens with a more economical LED chip and phosphor layer combination. Although LED chips have limited lifetimes, their lower cost and longer operational life compared to special lenses make them a more cost-effective solution for achieving the blue sky effect.
3Illumination intensity
If the lamp body height is increased to accommodate the special lens, then the blue sky effect is achieved, but the installation scenario is limited
Solution Approach 1:
The patent extracts the space-consuming special lens from the lamp design and replaces it with a compact LED chip and phosphor layer combination. This extraction reduces the required lamp body height to less than 30cm, thereby expanding installation scenarios and improving adaptability to various ceiling spaces.
Solution Approach 2:
The patent changes the optical system parameters from using a special lens requiring significant space to using an LED chip with 460-485nm peak wavelength and Sr2SiO4:Eu phosphor layer that achieves the same blue sky effect in a compact form factor, enabling installation in spaces with ceiling height less than 30cm.
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 a blue sky effect without increasing lamp height, reducing costs, and enabling color adjustment to simulate different lighting conditions, while maintaining brightness and aesthetic appeal.
Implementation Method 1
the outer surface of the LED chip is covered with a Sr2SiO4:Eu phosphor layer
Data Source
AI summary
A light source is provided, the source having a substrate; and an LED chip packaged on the substrate, wherein the peak wavelength range of the emitted light of the LED chip is 460-485 nm; the outer surface of the LED chip is covered with a Sr2SiO4:Eu phosphor layer or a Sr2SiO4:Eu phosphor glue layer. An LED lamp that comprises: a lamp housing; and the blue sky light source is also provided; as is a method for color adjustment of the LED lamp.