Ceramic Composite Light Conversion Material
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional methods for converting blue light from light-emitting diodes into white light face challenges such as non-uniformity, low brightness, and poor heat and ultraviolet resistance due to the use of phosphor powders with low transparency and epoxy resin coatings.
Innovation Solution
A ceramic composite material comprising two or more matrix phases, including an activated oxide phosphor phase, is used for light conversion, where the phases are continuously and three-dimensionally entangled, providing high brightness, excellent heat resistance, and ultraviolet resistance, and capable of converting blue light into white light by absorbing and emitting light at different wavelengths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a coating layer containing phosphor powder and epoxy resin is used for light conversion, then the structure is simple and easy to manufacture, but uniform white light cannot be obtained with good reproducibility due to difficulty in control for uniform mixing and film thickness
Solution Approach 1:
The invention uses a composite material consisting of a transparent base material (such as resin or glass) and phosphor particles dispersed within it. This composite structure allows for uniform light conversion while maintaining ease of manufacture. The transparent base material provides structural integrity and uniformity, while the phosphor particles perform the light conversion function, resolving the contradiction between manufacturing simplicity and uniformity control.
2Ease of manufacture
If phosphor powder with low transparency is used, then the material can be easily obtained, but high brightness cannot be achieved due to light absorption losses
Solution Approach 1:
The invention applies local quality by using a transparent base material specifically in the regions where light transmission is required, while concentrating the phosphor particles in specific distributions. This allows different parts of the material to have different optical properties - the transparent base material ensures high light transmission and brightness, while the phosphor particles provide localized light conversion functionality.
3Illumination intensity
If high-intensity light is obtained by increasing light conversion, then brightness improves, but heat storage arises as a problem requiring high heat resistance
Solution Approach 1:
The transparent base material acts as an intermediary between the phosphor particles and the external environment. It facilitates efficient heat dissipation from the phosphor particles to the surrounding area, preventing heat accumulation. This intermediary role allows the system to achieve high brightness through effective light conversion while managing the thermal load through the thermally conductive base material.
4Ease of manufacture
If epoxy resin is used for coating layer, then the material is easy to process, but ultraviolet light resistance becomes insufficient under high-intensity operation
Solution Approach 1:
The invention changes the material parameters by selecting base materials with specific properties - transparent materials with high ultraviolet resistance such as certain resins or glass. This parameter change maintains ease of manufacture while significantly improving ultraviolet light resistance and overall reliability under high-intensity operation conditions.
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 ceramic composite material achieves uniform light conversion, high brightness, and effective color mixing, while maintaining high thermal stability and ultraviolet resistance, enhancing the performance of light-emitting diodes as a low-power, long-life illumination source.
Implementation Method 1
a phosphor capable of absorbing light at a certain wavelength and emitting light at a wavelength different from the absorbed light
Implementation Method 2
a phosphor capable of absorbing light at a certain wavelength and emitting light at a wavelength different from the absorbed light
Implementation Method 3
mixing the converted light, with the unconverted irradiated light to cause conversion into light having a color tone different from the irradiated light
Data Source
AI summary
A ceramic composite material for light conversion, which is a solidified body comprising two or more matrix phases with respective components being two or more oxides selected from the group consisting of metal oxides and complex oxides each produced from two or more metal oxides, wherein at least one of the matrix phases is a phosphor phase containing an activated oxide. The solidified body is preferably obtained by the unidirectional solidification method. The ceramic composite material for light conversion is excellent in brightness, light-mixing property, heat resistance and ultraviolet light resistance.