Phosphor Substrate Structure for LED Color Conversion and Chromaticity Control
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Solution Overview
Problem
Existing LED lighting equipment 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 with a phosphor substrate and light emitting elements, where the phosphor substrate has a phosphor layer that covers the light emitting elements, allowing for wavelength conversion and adjusting the emitted light color by using a second phosphor with a different correlated color temperature, and a copper electrode layer for enhanced light emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a reflective material is provided on the substrate to improve light emitting efficiency, then light emitting efficiency is improved, but the ability to adjust light emission color is lost
Solution Approach 1:
The patent combines the reflective layer and phosphor layer into a single integrated structure on the substrate. The reflective layer reflects blue light from LEDs back through the phosphor layer, which converts the wavelength, thereby achieving both improved light extraction efficiency and adjustable emission color through phosphor selection.
Solution Approach 2:
The substrate structure is designed to perform multiple functions simultaneously: the reflective layer improves light extraction efficiency while the phosphor layer provides wavelength conversion for color adjustment. This multi-functional design allows the same structure to achieve both energy efficiency and color adaptability.
2Loss of energy
If the phosphor layer covers the entire front face including electrode layer, then wavelength conversion efficiency is improved, but electrical connection reliability may be compromised
Solution Approach 1:
The phosphor layer is selectively applied only to specific regions of the substrate where it is needed for wavelength conversion, while leaving the electrode contact areas exposed. This local application ensures that electrical connections remain reliable while still achieving effective phosphor conversion in the light-emitting regions.
Solution Approach 2:
The substrate surface is segmented into different functional zones: areas with phosphor coating for wavelength conversion and areas without coating for electrical connection. This segmentation allows each region to perform its specific function optimally without interfering with the other.
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 adjustment of the emitted light color to be different from the original light emitting element, reduces glare, and alleviates chromaticity variations, while maintaining efficient light emission.
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 reflective layer having a light extraction efficiency of 70% or more with respect to light emitted by the light emitting element
Data Source
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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, an electrode layer 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, in which a surface of the electrode layer facing an outer side in a thickness direction of the insulating substrate is a flat surface, and at least a part of the phosphor layer is disposed around a bonded portion of the electrode layer with the light emitting element.