Fluorescer Solution Settling Rate Equalization
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Solution Overview
Problem
In light-emitting devices with multiple types of fluorescent particles, the color of emitted light fluctuates due to differences in settling rates of particles during manufacturing, leading to inconsistent color reproducibility.
Innovation Solution
Adjusting the average particle sizes of fluorescent particles based on their densities to equalize settling rates, ensuring a consistent ratio of particles in the fluorescer solution and maintaining color stability across manufacturing timing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple types of fluorescent particles are contained in the fluorescer solution, then the control of emitted light color becomes more versatile, but the color of emitted light fluctuates with manufacturing timing
Solution Approach 1:
The patent changes the particle size parameter of fluorescent particles based on their density. Specifically, particles with higher density are given smaller average particle sizes, while particles with lower density are given larger average particle sizes. This parameter adjustment equalizes the settling rates of different particle types, ensuring consistent color reproduction across manufacturing batches while maintaining the versatility of multi-color control.
2Ease of manufacture
If fluorescent particles are dispersed in resin liquid, then the fluorescer solution can be easily manufactured, but the settling rates of different particle types differ causing color fluctuation
Solution Approach 1:
The patent adjusts the particle size parameter to compensate for density differences. By making high-density particles smaller and low-density particles larger, the settling rates are equalized. This maintains the ease of manufacturing through simple dispersion while achieving precise control over particle ratio consistency in the final product.
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 approach stabilizes the settling rates and ratios of fluorescent particles, resulting in high color reproducibility and reduced fluctuations in the emitted light's chromaticity, with a dispensing stability improvement from 3±0.3 mg to 3±0.1 mg over 20,000 dispenses.
Implementation Method 1
a fluorescent particle that absorbs the light and emits light having a second wavelength longer than the first wavelength
Implementation Method 2
average particle sizes of the types of fluorescent particles decreasing as densities of the types increase
Data Source
AI summary
In a fluorescer solution, a plurality of types of fluorescent particles are contained in a resin liquid. Average particle sizes of these fluorescent particles decrease as densities of the types increase. In other words, average settling rates vs of the types of the fluorescent particles ascertained byvs=Dp2×(ρp-ρf)×g18×ηare equal to each other, where Dp is an average particle size of each of the types of fluorescent particles, pp is a density of each of the types of fluorescent particles, pf is a density of the resin liquid, η is a viscosity of the resin liquid, g is the acceleration due to gravity, and vs is an average settling rate of each of the types of fluorescent particles.