Beta-Sialon Fluorescent Material Production via Basic Substance Treatment
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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 specific steps and conditions such as temperature, atmosphere, and particle size regulation.
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 is insufficient
Solution Approach 1:
The invention changes the chemical parameter of the treatment medium from acidic to basic. Specifically, it uses a basic substance containing calcium (such as calcium hydroxide, calcium carbonate, or calcium oxide) instead of conventional acid treatments. This parameter change fundamentally alters the chemical reaction pathway during heat treatment, leading to the formation of beta-sialon fluorescent material with significantly enhanced emission intensity while maintaining process simplicity
Solution Approach 2:
The invention creates a composite treatment system by combining the basic substance (calcium-containing compound) with the silicon nitride base material during heat treatment. This composite approach allows the calcium to incorporate into the crystal structure of the beta-sialon fluorescent material, enhancing its luminescent properties through compositional modification rather than requiring separate treatment steps
2Illumination intensity
If multiple heat treatment steps are performed, then emission intensity improves, but production time increases
Solution Approach 1:
The invention performs preliminary action by incorporating the calcium-containing basic substance into the mixture before the main heat treatment step. This pre-incorporation allows the calcium to be readily available during the single heat treatment step, enabling the formation of high-emission beta-sialon material in one step rather than requiring multiple sequential heat treatment and treatment steps
Solution Approach 2:
The invention merges the heat treatment step with the chemical treatment step into a single integrated process. By combining the basic substance with the raw materials before heating, the thermal processing simultaneously achieves both the phase transformation to beta-sialon and the chemical modification for enhanced emission, eliminating the need for separate treatment steps
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 produces β-sialon fluorescent materials with significantly higher emission intensity, up to 50% improvement compared to traditional methods, enabling better color rendering and lighting efficiency.
Implementation Method 1
heat treating the composition
Implementation Method 2
calcining the mixture at about 2000° C.
Implementation Method 3
contacting the heat treated composition with a basic substance
Implementation Method 4
europium oxide (Eu2O3) as an activator
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 aluminum, an oxygen atom, and europium, heat treating the composition, and contacting the heat-treated composition with a basic substance.