Beta-Sialon Fluorescent Material Surface Area Optimization
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Solution Overview
Problem
Current methods for producing β-sialon fluorescent materials do not adequately enhance light emission luminance, limiting their efficiency in applications such as lighting systems and liquid crystal display devices.
Innovation Solution
A method involving the preparation of a calcined β-sialon product, followed by grinding to achieve a specific surface area of 0.2 m2/g or more, and subsequent heat-treating, with the option to repeat grinding and heat-treating steps to ensure an average particle diameter of 40 μm or less, thereby optimizing the incorporation of activating elements and enhancing light emission intensity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional calcination methods are used to produce β-sialon fluorescent materials, then the production process is simple, but the light emission luminance is insufficient
Solution Approach 1:
The patent applies preliminary action by performing grinding treatment to increase specific surface area before the final heat treatment step. This preliminary preparation of the calcined product ensures that subsequent heat treatment can achieve high light emission luminance more effectively, as the increased surface area improves reacting ability and activating element incorporation
Solution Approach 2:
The patent applies parameter changes by controlling specific surface area (0.2 m²/g or more) and particle diameter (40 μm or less) as key parameters. By adjusting these physical parameters through grinding and heat treatment, the light emission luminance is significantly enhanced while maintaining a manageable production process
2Illumination intensity
If the calcined product is not ground sufficiently, then the production process is fast, but the specific surface area is too low to enhance light emission intensity
Solution Approach 1:
The patent applies parameter changes by setting specific thresholds for specific surface area (0.2 m²/g or more) and particle diameter (40 μm or less). These quantified parameters provide clear targets for the grinding process, enabling optimization of both grinding time and light emission intensity through controlled parameter adjustment
3Manufacturing precision
If the particle diameter is not controlled, then the manufacturing process is simple, but the uniformity of fluorescent material performance is poor
Solution Approach 1:
The patent applies parameter changes by establishing a maximum particle diameter threshold (40 μm or less) through controlled heat treatment. This parameter control ensures uniform particle size distribution and consistent fluorescent performance while maintaining relatively simple process control through well-defined thermal processing 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 method results in β-sialon fluorescent materials with significantly improved light emission intensity, as demonstrated by increased relative light emission intensity and uniform particle size distribution, enhancing their performance in lighting and display applications.
Implementation Method 1
heat-treating the ground product to obtain a heat-treated product
Implementation Method 2
β-sialon fluorescent material which is excited in a wide wavelength region of from near-ultraviolet light to blue light and has a peak light emission wavelength in the range of 520 nm or longer and 560 nm or shorter
Data Source
AI summary
Provided is a method of producing a β-sialon fluorescent material having a high light emission intensity and an excellent light emission luminance. The method includes preparing a calcined product having a composition of β-sialon containing an activating element; grinding the calcined product to obtain a ground product; and heat-treating the ground product to obtain a heat-treated product. A specific surface area of the ground product is 0.2 m2/g or more.