Wavelength Converting Material Particle Size Distribution
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Solution Overview
Problem
Phosphor particles of varying sizes in LED wavelength conversion technologies affect overall light efficiency, as smaller particles result in lower light intensity, while larger particles emit light more intensely, necessitating a uniform size distribution for consistent performance.
Innovation Solution
A wavelength converting material comprising wavelength converting particles with an average size greater than 5 μm, where 90% are smaller than a μm, 50% smaller than b μm, and 10% smaller than c μm, with a size distribution ratio of (a-c)/b ≤ 0.5, ensuring consistent light absorption and emission across the particle range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If phosphor particles with different sizes are used, then the light efficiency varies, but achieving uniform size distribution is difficult
Solution Approach 1:
The patent applies parameter changes by precisely controlling the particle size parameters of phosphor particles. It specifies that 90% of particles have size smaller than a μm, 50% smaller than b μm, and 10% smaller than c μm, with the constraint (a-c)/b≤0.5. This quantitative parameter control ensures uniform particle size distribution, which directly improves light efficiency while maintaining manufacturing feasibility through controlled parameter ranges.
2Illumination intensity
If smaller phosphor particles are used, then light intensity decreases, but if larger particles are used, then light emission becomes inconsistent
Solution Approach 1:
The patent applies homogeneity by ensuring uniform particle size distribution through the specified size constraints. By controlling that 90% of particles are smaller than a μm, 50% smaller than b μm, and 10% smaller than c μm with (a-c)/b≤0.5, the patent creates a homogeneous particle population. This homogeneity ensures consistent light emission across all particles while maintaining sufficient light intensity, resolving the contradiction between intensity and consistency.
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
This size distribution ensures a consistent and enhanced light intensity of the second light emitted, improving the overall light efficiency and color mixing in LED-based lighting systems.
Implementation Method 1
The phosphor layer is photoluminescence substance and can absorb a first light emitted from the LED to emit a second light different from the first light
Data Source
AI summary
This disclosure discloses a wavelength converting material. The wavelength converting material comprises a plurality of wavelength converting particles, the wavelength converting particles having an average particle size greater than 5 μm, and wherein each of the wavelength converting particles has a particle size. 90% of the wavelength converting particles have the particle size smaller than a μm; 50% of the wavelength converting particles have the particle size smaller than b μm; and 10% of the wavelength converting particles have the particle size smaller than c μm; wherein (a−c)/b≦0.5.