Ceramic Spherical Color Converters for LED Chromaticity Control
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Solution Overview
Problem
The production of LEDs, particularly for white light emitting devices using blue LEDs and phosphor materials, is complex due to the sophisticated techniques required for color converter materials, which are needed to absorb and emit light in different wavelengths for green and red colors.
Innovation Solution
A light emitting device incorporating ceramic spherical color converter materials with specific size, shape, and density characteristics, allowing for easy assembly, precise chromaticity control, and efficient light conversion and outcoupling, using techniques such as isostatic pressing and secondary treatments to achieve optimal luminescent properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional color converter materials are used in LED production, then the LED can emit light in different wavelengths, but the manufacturing process becomes complex and requires sophisticated techniques
Solution Approach 1:
The patent changes the physical parameters of the color converter material by using spherical particles with specific diameter ranges (0.1-2.0 mm) instead of conventional powder forms. This parameter change enables simple pouring and settling processes, eliminating complex manufacturing techniques while maintaining the light wavelength conversion function
Solution Approach 2:
The color converter is divided into discrete spherical particles that can be independently handled and positioned. This segmentation allows the material to be simply poured and settled into the desired configuration, avoiding complex manufacturing processes while still achieving the required light conversion functionality
2Ease of operation
If spherical color converter materials are used, then assembly is simplified and densely packed structures are achieved, but the material must be precisely controlled in size and shape
Solution Approach 1:
The patent specifies precise parameter ranges for the spherical particles, including diameter (0.1-2.0 mm) and shape uniformity (90-100% of average diameter). These controlled parameters enable both easy assembly through pouring and settling, and optimal light conversion properties through consistent particle behavior
3Measurement precision
If macroscopic spherical spheres are used for color conversion, then accurate dosing and chromaticity control are achieved, but the material requires specific density and uniformity properties
Solution Approach 1:
The patent controls multiple parameters simultaneously - particle diameter (0.1-2.0 mm), shape uniformity (90-100% of average diameter), and density (2.0-4.0 g/cm³). This multi-parameter control enables accurate dosing and superior chromaticity control while maintaining manufacturability through simple pouring and settling processes
4Use of energy by moving object
If spherical color converter materials are used, then excellent light conversion and outcoupling properties are achieved, but the material must maintain specific spherical shape with minimal deviation
Solution Approach 1:
The patent specifies that 90-100% of the spherical particles must have diameters within 90-100% of the average diameter, ensuring high spherical uniformity. This shape control maximizes light conversion and outcoupling efficiency by ensuring consistent optical properties across all particles, while the particles remain manufacturable through conventional spherical formation techniques
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 use of ceramic spherical color converter materials simplifies the LED manufacturing process, enhances chromaticity control, and reduces light loss by minimizing scattering, resulting in improved luminescent properties and easier adjustment of color properties in a wide range of applications.
Implementation Method 1
the color converter material especially means and/or includes a material which is capable of absorbing light from the light emitting device and emitting light in a different wavelength
Data Source
AI summary
The invention relates to a light emitting device comprising at least one light source and at least one ceramic spherical color converter material, which helps to ease the manufacture as well as to improve the luminescence properties of the light emitting device.