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Optical pressure measurement technology, which is based on non-contact monitoring of pressure by observing the luminescent characteristics of luminescent materials under pressure influence, has always been widely popular. Therefore, the development of luminescent materials with high pressure-sensitivity, high accuracy, and a wide pressure application range has become a key focus. In this paper, the optical pressure sensing performance of a Mn2+-based pyroxene-type luminescent material (CaZnGe2O6:0.02Mn2+) is reported. Within the pressure range of 0.33~9.49 GPa, it demonstrates high sensitivity and excellent cyclic repeatability based on the pressure measurement strategies of both the spectral shift and luminescent intensity ratio. As the pressure increases, the maximum absolute sensitivity (Sa) values (dλ/dP) of the green and red emission positions of Mn2+ at different sites in the matrix reach 10.47 nm/GPa and 4.83 nm/GPa, respectively, which are 28.7 and 13.2 times those of the ruby pressure gauge (Al2O3:Cr3+). Compared to the traditional method that uses a single luminescent peak, this pressure measurement method employing the position shift os dual-luminescent emission can enhance the accuracy and reliability of pressure measurement more effectively. In addition, it is the first time to calculate the pressure sensitivity of Mn2+-based luminescent materials using the ratio of spectral integral intensities in selected areas, and the obtained maximum relative pressure sensitivity (Sr) value is 64.28 %/GPa, with Sr remaining above 16.06 %/GPa throughout a rather wide pressure range. Undoubtedly, CaZnGe2O6:0.02Mn2+ exhibits extremely outstanding optical pressure measurement performance, demonstrating its great application potential in the field of optical pressure sensing.
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Keywords:
- Manganese Ions /
- Double Perovskite /
- Highly Sensitive /
- Optical Pressure Sensing
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