Beta-Sialon Fluorescent Material Production Method
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Solution Overview
Problem
Current methods for producing β-sialon fluorescent materials do not achieve high enough emission intensity, which is necessary for improved color reproduction and lighting systems.
Innovation Solution
A method involving the provision of a composition containing silicon nitride, aluminum, and europium, followed by heat treatment and contact with a basic substance to enhance emission intensity, including steps such as first and second heat treatments, base treatment, and washing to produce β-sialon fluorescent materials with improved properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional heat treatment and acid treatment methods are used, then the production process is simple, but the emission intensity of the β-sialon fluorescent material is insufficient
Solution Approach 1:
The production process is divided into multiple sequential treatment steps: heat treatment to form the β-sialon phase, base treatment to activate the surface and enhance luminescence, and acid treatment to remove unwanted phases. This segmentation allows each step to optimize specific properties, ultimately achieving high emission intensity that cannot be obtained through single-step conventional methods.
Solution Approach 2:
The invention employs specific parameter ranges for each treatment step: heat treatment at 1500-2000°C, base treatment with controlled pH and duration, and acid treatment with optimized concentration and time. By precisely controlling these parameters, the method achieves maximum emission intensity while managing process complexity through systematic optimization.
2Illumination intensity
If multiple heat treatment steps are performed, then emission intensity improves, but production time and energy consumption increase
Solution Approach 1:
The first heat treatment step is designed to pre-form the β-sialon phase structure before the base treatment. This preliminary action ensures that the crystal structure is sufficiently developed to respond to subsequent base treatment, allowing the second heat treatment to be shorter and more focused on optimizing luminescence properties rather than forming the phase from scratch.
Solution Approach 2:
The multiple heat treatment steps are connected by the base treatment step, creating a continuous process where each treatment builds upon the previous one. The base treatment activates the surface during the cooling period between heat treatments, ensuring that the useful action of phase formation and activation continues without interruption, thereby reducing total production time.
3Illumination intensity
If base treatment is applied to enhance emission intensity, then fluorescent material performance improves, but surface quality may deteriorate
Solution Approach 1:
The base treatment acts as an intermediary step between heat treatment and acid treatment. It modifies the surface chemistry to enhance luminescence while the subsequent acid treatment serves as a corrective step to remove excess base treatment products that could degrade surface quality. This intermediary approach allows emission intensity enhancement while maintaining surface integrity through the balancing action of the final acid treatment.
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 higher emission intensity, suitable for applications in lighting systems and displays, achieving enhanced color reproduction and efficiency.
Implementation Method 1
heat treating the composition
Implementation Method 2
contacting the heat treated composition with a basic substance
Implementation Method 3
washing the composition, which has been contacted with the basic substance, with an acidic liquid medium
Data Source
AI summary
A method for producing β-sialon fluorescent material having excellent emission intensity is provided. The method for producing β-sialon fluorescent material includes providing a composition comprising silicon nitride that contains aluminium, an oxygen atom, and europium, heat treating the composition, contacting the heat-treated composition with a basic substance, and washing the composition, which has been contacted with the basic substance, with an acidic liquid medium.