Improving Accuracy and Sensitivity of Lanthanide-Based Luminescent Manometers by Augmented Spectral Shift Method

Identifier:  imarina:9445996

Handle: https://hdl.handle.net/20.500.11797/imarina9445996

Authors:  Pieprz, M; Runowski, M; Ledwa, K; Carvajal, J J; Bednarkiewicz, A; Marciniak, L

Abstract:
Luminescence manometry is most often realized by a spectral shift of luminescence bands. Typically, the shift of spectrally narrow-band emission is quantified, which is highly precise but not very sensitive to pressure variations. Alternatively, the spectral shift of a broadband emission may be exploited, which is more sensitive but less precise, due to the difficulty in accurate determination of the band centroid. In this work, a mixed approach is presented, combining the shift in broadband chromium emission from the T-4(2) -> (4)A(2) level with a narrow-band neodymium emission (F-4(3/2) -> I-4(11/2) transition), observed in the La3Ga5GeO14 spectrum. The resulting optical Nd3+-based manometer demonstrates an absolute sensitivity of 2.92 cm(-1)/GPa for the F-4(3/2) -> I-4(11/2) electronic transition. An additional advantage of using this material is its negligible spectral shift with temperature, determined in the T range of 77-343 K, making the pressure readouts independent of this parameter (i.e., temperature variations).