Ceramic Phosphor Composite for Stable Light Color Tone
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Solution Overview
Problem
Existing ceramic complexes with fluorescent materials experience fluctuations in color tone due to variations in particle size and distribution, which affect the consistency of light emission.
Innovation Solution
A ceramic complex is formulated with specific volume ratios of first and second crystal phases, where the first phase contains a rare earth aluminate fluorescent material and the second phase contains aluminum oxide, with controlled particle sizes and distributions to minimize color tone fluctuations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the particle size and distribution of fluorescent material are not controlled, then the manufacturing process is simpler, but the color tone fluctuation increases
Solution Approach 1:
The patent applies parameter changes by precisely controlling the particle size parameters of aluminum oxide particles (average particle diameter 5-20 μm) and their distribution in the ceramic complex. By changing and optimizing these physical parameters, the invention achieves uniform light scattering properties that suppress color tone fluctuation while maintaining manufacturability through standard sintering processes.
Solution Approach 2:
The patent creates a composite material structure where aluminum oxide particles are distributed within a fluorescent material matrix. This composite approach combines the light scattering properties of aluminum oxide with the luminescent properties of the fluorescent material, achieving both color tone consistency and efficient light emission through the synergistic interaction of different materials.
2Illumination intensity
If aluminum oxide particle size is increased, then light scattering capability improves, but color tone uniformity deteriorates
Solution Approach 1:
The patent optimizes the particle size parameter of aluminum oxide to a specific range (average diameter 5-20 μm). This parameter optimization balances light scattering capability with color tone uniformity by selecting a size that provides sufficient scattering without creating excessive variation in light path lengths that would cause color fluctuations.
Solution Approach 2:
The patent applies local quality by ensuring uniform distribution of aluminum oxide particles throughout the fluorescent material matrix. Rather than using a single particle size throughout, the controlled distribution creates consistent local scattering properties across the entire ceramic complex, maintaining color uniformity while achieving overall high scattering capability.
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 controlled ceramic complex effectively suppresses fluctuations in emitted light color tone by uniform scattering and conversion of incident light, ensuring consistent light emission.
Implementation Method 1
The ceramic complex effectively suppresses fluctuations in emitted light color tone by uniform scattering and conversion of incident light
Implementation Method 2
a first crystal phase that contains a first rare earth aluminate fluorescent material containing an activating element
Data Source
AI summary
A ceramic complex including a first crystal phase containing a first rare earth aluminate fluorescent material containing an activating element and a first rare earth element that is different from the activating element, and a second crystal phase containing aluminum oxide, having a content of the first crystal phase in a range of 5% by volume or more and 40% by volume or less and a content of the second crystal phase in a range of 57% by volume or more and 95% by volume or less based on a total amount of the ceramic complex, having an average value of a second crystal diameter of the second crystal phase measured under the particular measurement condition of 12 μm or less, and having a QD value of 0.5 or less expressed by QD=(D75−D25)/(D75+D25), wherein D25 and D75 are defined in the disclosure.