A method for preparing luminescent silicon nitride nanopowder

By employing steps such as mixing and grinding, granulation, pressing and molding, and supercritical CO2 extraction, the problems of insufficient thermal stability and luminescence intensity in the preparation of silicon nitride nanopowder were solved, and the preparation of high-purity, uniformly sized, and thermally stable luminescent silicon nitride nanopowder was achieved.

CN122079643APending Publication Date: 2026-05-26QILU UNIVERSITY OF TECHNOLOGY (SHANDONG ACADEMY OF SCIENCES)
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
QILU UNIVERSITY OF TECHNOLOGY (SHANDONG ACADEMY OF SCIENCES)
Filing Date
2026-03-30
Publication Date
2026-05-26

AI Technical Summary

Technical Problem

Existing technologies struggle to prepare high-purity silicon nitride nanopowders with uniform particle size, good thermal stability, and high luminescence intensity, as they suffer from incomplete reaction, poor crystallinity, numerous surface defects, and low luminescence intensity.

Method used

By employing steps such as mixing and grinding, granulation, pressing and molding, supercritical CO2 extraction and combustion reaction, combined with appropriate temperature and atmosphere control, luminescent silicon nitride nanopowder is prepared to ensure uniform mixing of silicon powder and metal powder, avoid oxidation and agglomeration, and achieve uniform doping of metal ions and complete combustion reaction.

Benefits of technology

This study achieved high thermal stability and high luminescence efficiency in luminescent silicon nitride nanoparticles, avoiding problems such as uneven grain size and uneven metal ion doping, and improving the purity and luminescence intensity of the product.

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Abstract

This invention discloses a method for preparing luminescent silicon nitride nanopowder. The method involves mixing and grinding silicon powder and doped powder at a first temperature ≤ -50℃ to obtain raw material powder. The doped powder includes metal powder, specifically one or more of aluminum powder, lanthanum powder, yttrium powder, europium powder, and terbium powder. The raw material powder, binder, and solvent are mixed in a specific ratio to obtain a powder slurry. The powder slurry is granulated to obtain a particle preform. The particle preform is pressed to obtain a primary pre-fired preform. The primary pre-fired preform undergoes supercritical CO2 extraction to obtain a secondary pre-fired preform. The secondary pre-fired preform is subjected to a combustion reaction in a reaction gas atmosphere to obtain a reaction product. The reaction gas includes nitrogen or a mixed gas, wherein the mixed gas is nitrogen and hydrogen, with hydrogen accounting for 5%-10%. The reaction product is ball-milled and sieved to obtain luminescent silicon nitride nanopowder. The obtained nanopowder exhibits good thermal stability and high luminescence intensity.
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