Highly Pressure-Sensitive, Temperature Independent Luminescence Ratiometric Manometer Based on MgO:Cr3+ Nanoparticles
Title: Highly Pressure-Sensitive, Temperature Independent Luminescence Ratiometric Manometer Based on MgO:Cr3+ Nanoparticles
Autorhs: M. Szymczak, M. Runowski, V. Lavín, L. Marciniak
Journal: Laser & Photonics Reviews
In their recent article, a group of prof. Lukasz Marciniak is studying Highly pressure-sensitive, temperature independent luminescence ratiometric manometer based on MgO:Cr3+
Despite its initial stage of development, ratiometric luminescence manometry has been gaining scientific interest in recent years due to its numerous advantages. This is due to the high sensitivity and accuracy of the reading it offers, but above all to the possibility of using it in the imaging of pressure changes.
In this work, the manometric parameters of two ratiometric techniques used in the case of manometers doped with Cr3+ ions were compared on the example of MgO:Cr3+. It was verified how the pressure change affects I) the ratio of the emission intensity of the 2E→4A2 band to the 4T2→4A2 band and II) the ratio of the emission intensity of the 4T2→4A2 band integrated in two spectral ranges. As shown in the first approach, a very strong susceptibility of the intensity ratio of these bands to pressure changes was observed, resulting in a relative sensitivity of 40%/GPa as opposed to 9.8%/GPa in the second case. However, the thermal coupling of the 2E and 4T2 levels of Cr3+ ions makes the ratio of their emission intensity very strongly dependent also on temperature changes. This is a significant limitation that may reduce the reliability of the pressure reading. The second of the analyzed approaches shows much lower sensitivity to temperature changes. The presented comparative analysis showed that the luminescence intensity ratio of the 4T2→4A2 band of Cr3+ ions enables the reading of the pressure in a thermally independent manner, guaranteeing high measurement precision.
