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In this study, single-crystal Si3N4:Eu2+ nanowires were successfully synthesized via a direct current arc plasma nitridation method. The as-synthesized product, characterized by X-ray diffraction, X-ray photoelectron spectroscopy, energy-dispersive X-ray spectroscopy, scanning electron microscopy, and transmission electron microscopy, consists of tightly packed bundles of nanowires. These nanowires have diameters ranging from tens to hundreds of nanometers and lengths up to several tens of micrometers. Under ultraviolet excitation, the nanowires display a bright yellow emission band centered at approximately 589 nm, which is assigned to the 4f65d1→4f7 transition of Eu2+ ions. The photoluminescence properties were investigated under hydrostatic pressure up to 30 GPa. As the pressure increases, the Eu2+ emission band shows a significant and monotonic red shift at a rate of approximately 1.45 nm·GPa-1. This shift is primarily attributed to pressure-induced modifications in the energy level structure, resulting from reduced interionic distances and enhanced ionic interactions. Concurrently, the full width at half maximum (FWHM) of the emission band broadens with a pressure coefficient of about 0.8% GPa-1, which can be explained by the combined effects of an enhanced crystal field, intensified electron-phonon coupling, lattice strain, and distortion. A pressure-sensing model based on chromaticity coordinate analysis was established, demonstrating high performance with a maximum sensitivity of 0.78% GPa-1. The stable correlation between these optical parameters and applied pressure enables high-precision sensing. The developed optical sensor exhibits a suite of advantageous characteristics, including high sensitivity, a broad pressure detection range (up to 30 GPa), and excellent signal stability (maintaining 38% of the initial intensity at 23 GPa). These results indicate significant application potential for Si3N4:Eu2+ nanowires in high-pressure sensing under extreme conditions, such as deep-sea exploration, studies of planetary interiors, and monitoring of ultra-heavy construction.
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Keywords:
- Silicon Nitride /
- Photoluminescence /
- High Pressure /
- Pressure Sensing
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