Pressure-Induced Remarkable Spectral Red-Shift in Mn²⁺ -Activated NaY₉ (SiO₄ )₆ O₂ Red-Emitting Phosphors for...

Area of Science:

• Materials Science
• Solid State Chemistry
• Luminescence

Background:

• Luminescent manometers require high sensitivity for accurate pressure measurements.
• Existing luminescent materials often exhibit limited sensitivity, hindering precise pressure detection.

Purpose of the Study:

• To develop novel red-emitting phosphors with enhanced pressure sensing capabilities.
• To investigate the performance of Mn²⁺-activated NaY₉(SiO₄)₆O₂ phosphors for optical manometry.

Main Methods:

• Synthesis of Mn²⁺-activated NaY₉(SiO₄)₆O₂ red-emitting phosphors.
• Characterization using photoluminescence spectroscopy (excitation and emission spectra).
• Analysis of temperature-dependent and pressure-dependent Raman spectra.

Main Results:

• The phosphors exhibit bright red emission (⁴T₁(⁴G) → ⁶A₁ transition of Mn²⁺) with optimal activator concentration at ≈1 mol%.
• Excellent thermal stability was confirmed with a derived activation energy of 0.275 eV.
• High pressure sensitivity was achieved: spectral shift sensitivity (dλ/dP) of 7.00 nm GPa^-1 and ultra-high full width at half maximum (FWHM) sensitivity (dFWHM/dP) of 10.13 nm GPa^-1.

Conclusions:

• The developed Mn²⁺-activated NaY₉(SiO₄)₆O₂ phosphors are suitable for ultrasensitive optical manometry.
• The sensitivity achieved, particularly in the band-width mode (FWHM), positions this manometer as a global leader.