Phosphor Substrate Structure for LED Color Tuning and Chromaticity Control
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Solution Overview
Problem
Existing LED lighting equipment configurations, such as those disclosed in CN 106163113 A, cannot adjust the emitted light color to be different from the light emitted by the light emitting element, limiting flexibility in light emission color adjustment.
Innovation Solution
A light emitting substrate comprising a phosphor substrate with a phosphor layer and electrode pairs, where the phosphor layer covers a significant portion of the substrate's front face, including areas other than the electrode pairs, allowing for the adjustment of light emission color through the use of phosphors with different correlated color temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a reflective material is provided on the substrate surface, then light emitting efficiency is improved, but the ability to adjust light emission color is limited
Solution Approach 1:
The patent applies parameter changes by incorporating phosphors with different correlated color temperatures (CCT) into the encapsulating resin. By adjusting the ratio and types of phosphors (e.g., yellow phosphor with 560-580nm peak, red phosphor with 610-650nm peak), the light emission color can be tuned across different CCT ranges while maintaining the reflective substrate for efficiency. This resolves the contradiction by enabling color adjustment without sacrificing light emitting efficiency.
Solution Approach 2:
The patent uses composite materials by combining multiple phosphors (yellow phosphor particles and red phosphor particles) within the encapsulating resin. This composite phosphor system allows simultaneous optimization of light emission efficiency (through reflective substrate) and color adjustability (through phosphor composition ratios), directly resolving the technical contradiction between efficiency and adaptability.
2Adaptability or versatility
If multiple phosphors with different correlated color temperatures are used, then light emission color adjustability is improved, but chromaticity variation occurs
Solution Approach 1:
The patent applies local quality by creating a uniform distribution of multiple phosphor types within the encapsulating resin that surrounds each LED chip. This ensures that different phosphors (yellow and red) are locally distributed in controlled proportions, allowing color adjustment while maintaining consistent chromaticity across the entire light emitting surface, thus reducing chromaticity variation.
Solution Approach 2:
The patent implements preliminary action by pre-mixing phosphors with different correlated color temperatures in specific ratios within the encapsulating resin before LED mounting. This preliminary preparation ensures uniform phosphor distribution and consistent chromaticity output, preventing chromaticity variation while maintaining color adjustability through the selected phosphor composition.
3Adaptability or versatility
If phosphor layer covers large area including electrode regions, then light emission color adjustment is improved, but electrode visibility and connection reliability may be affected
Solution Approach 1:
The patent applies segmentation by dividing the substrate surface into distinct functional regions: electrode pairs for electrical connection and phosphor-containing regions for light emission color adjustment. The encapsulating resin with phosphors is applied selectively to cover large areas for color adjustment while leaving electrode regions exposed or appropriately configured, ensuring both color adjustability and electrode connection reliability are maintained.
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
Enables the adjustment of light emission color from the phosphor substrate to be different from the light emitting element, reducing glare and alleviating chromaticity variations while improving light emission efficiency and heat dissipation.
Implementation Method 1
a phosphor layer which is excited by receiving light emitted from the LED element, to emit wavelength-converted light
Implementation Method 2
a flat plate-like monocrystalline phosphor disposed away from the light-emitting element, which absorbs the blueish laser light and then radiates yellowish wavelength-converted light
Data Source
Figure 1A
Figure 1B
Figure 1C
AI summary
A phosphor substrate of the present invention is a phosphor substrate having at least one light emitting element mounted on one surface, and includes an insulating substrate, at least one pair of electrode pair which is disposed on one surface of the insulating substrate and bonded to the light emitting element, and a phosphor layer which is disposed on one surface of the insulating substrate and includes a phosphor in which a light emission peak wavelength, in a case where light emitted by the light emitting element is used as excitation light, is in a visible light region.