Multi-wavelength LED with Segmented Fluorescent Layers
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing multi-wavelength LEDs face issues with poor light emitting efficiency and inaccurate color due to mutual interference between different colored fluorescent powders excited by the light source, making it difficult to control the quality and proportion of the fluorescent materials effectively.
Innovation Solution
A multi-wavelength LED construction where specific fluorescent materials of different wavelengths are coated on the base layer and peripheral of the light-emitting chip, allowing for independent excitation and easy control of their amounts and ratios, preventing mutual interference and enhancing light emitting efficiency and color accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If multiple fluorescent powders of different colors are mixed in the fluorescent gel to produce RGB mixing results, then the color development properties are improved and the light color is closer to white light, but the fluorescent powders interfere with each other due to simultaneous excitation at the same position, making it difficult to control the amount and proportion of fluorescent powders
Solution Approach 1:
The patent divides the fluorescent materials into different spatial locations: some fluorescent powders are mixed in the chip mounting gel at the base layer, while other fluorescent powders are mixed in the fluorescent gel applied above the chip. This spatial segmentation prevents simultaneous excitation and interference, allowing independent control of each fluorescent material's amount and proportion.
Solution Approach 2:
Different fluorescent materials are placed in different locations with specific functions: the chip mounting gel contains fluorescent powders for certain wavelengths, while the fluorescent gel above contains different fluorescent powders for other wavelengths. Each location has optimized fluorescent composition tailored to its specific excitation and emission requirements.
2Illumination intensity
If fluorescent powders of shorter wavelength are used, then they can be excited to emit light, but they absorb energy from longer wavelength fluorescent powders, preventing accurate estimation of consumption ratio and failing to achieve expected color deflection
Solution Approach 1:
The patent separates fluorescent materials by wavelength into different spatial zones. Shorter wavelength fluorescent powders are placed in one gel layer while longer wavelength fluorescent powders are placed in another gel layer, eliminating the energy absorption interference that occurs when they are mixed together.
3Adaptability or versatility
If fluorescent powder of shorter wavelength emits light of slightly longer wavelength which in turn excites fluorescent powder to emit light of even longer wavelength, then multiple wavelengths are produced, but the light emitting efficiency is compromised and luminance is reduced
Solution Approach 1:
The patent eliminates the cascaded excitation energy loss by placing different wavelength fluorescent materials in separate gel layers. Each fluorescent material is directly excited by the blue chip without being excited by other fluorescent materials, preserving energy and improving light emitting efficiency while still achieving multi-wavelength output.
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 higher light emitting efficiency and accurate color production, facilitating quality control and increasing production capacity by eliminating interference between fluorescent powders of varying wavelengths.
Implementation Method 1
the fluorescent powders in the fluorescent gel 50 are excited by the light source from the light-emitting chip 10 to emit the light in an expected color
Data Source
AI summary
A multi-wavelength LED construction and its manufacturing process having respectively coated on the base layer and the position above the peripheral of the light emitting chip a fluorescent material of a specific wavelength to be excited to provide higher light emitting efficiency and expected light color without mutual interference when the chip is conducted so to facilitate quality control of the multi-wavelength LED.