In scientific research and industrial applications, an accurate pressure measurement is essential for ensuring process control and safety. However, the pressure measurement range of high-sensitivity pressure measuring materials often fails to meet growing demands. Here, we report a new type of inorganic phosphor, Zn3Ga2GeO8:Mn4+, which offers higher sensitivity and a broader pressure measurement range. By employing in situ high-pressure photoluminescence (PL) measurement techniques, we conducted an in-depth analysis of the spectral characteristics of Zn3Ga2GeO8:Mn4+ under various pressures. The experimental results reveal a notable and consistent linear redshift of the luminescence peak center under pressure loading, exhibiting a pressure sensitivity of up to 0.844 nm/GPa, outperforming numerous current pressure sensing materials. Moreover, absorption spectral analysis indicates that the band gap decreases with increasing pressure, aligning with the phenomenon of redshift observed in PL. Meanwhile, Raman spectroscopy analysis confirms the stability of the material under high-pressure conditions. Our findings support the potential of Zn3Ga2GeO8:Mn4+ as a superior pressure sensor and contribute to the advancement of pressure sensing technology.
Optical manometry is a highly promising method for measuring pressure. However, its wider application is limited by the lower sensitivity and influenced by environmental factors. Herein, multi-mode optical pressure sensors based on Eu 2+ -doped Li 4 SrCa(SiO 4 ) 2 phosphors suitable for a variety of complex pressure-measuring environments are designed. The phosphors contain two separate luminescence centers at 443 nm (Eu Sr ) and 584 nm (Eu Ca ), respectively. In the lower pressure range, the emission peak undergoes a massive redshift of 5.19 nm GPa −1 of Eu Ca , which is 14× better than commercially available ruby sensors. In order to improve the pressure response range and the accuracy of pressure measurement, for the first time, a new approach in the pressure readout method in which single Eu 2+ ions doping based on fluorescence intensity ratio (FIR) pressure measurement is realized in designed materials. Meanwhile, the measured full width at half maximum (FWHM) as an indicator of pressure sensor performance also reveals that the sensing performance is d FWHM /d P ≈ 1.23 nm GPa −1 and d FWHM /d P ≈ 0.84 nm GPa −1 for Eu Sr and Eu Ca positions, respectively. Additionally, the structural stability of the phosphor is confirmed by in situ Raman spectrum. The above results indicate that the Li 4 SrCa(SiO 4 ) 2 :0.04Eu 2+ phosphor is a good candidate for multi-mode optical pressure sensors.
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