Thirty-Fold Increase in Relative Sensitivity of Dy3+ Luminescent Boltzmann Thermometers Using Multiparameter and Multilevel Cascade Temperature Readings

The sensitivity of luminescent Boltzmann thermometers is restricted by the energy difference between thermally coupled excitement levels trivalent lanthanides, and their values further decrease with increases in temperature, rendering use at high temperatures difficult. Here, we demonstrate how to overcome this limitation employing multiparameter multilevel cascade temperature readings. For purpose, synthesized Dy3+:Y2SiO5, a phosphor whose emission known begin quenching very temperatures. Its photoluminescence-emission features, later used for thermometry, consisted two blue bands centered around 486 nm 458 nm, 430 398 which were only visible elevated Next, performed thermometry using standard luminescence-intensity ratio (LIR) method, employs 4F9/2 4I15/2 Dy3+ levels’ emissions additionally uses 4G11/2 level overlapping intensities 4I13/2, 4M21/2, 4K17/2, 4F7/2 create LIRs larger than LIR. This approach yielded that was 3.14 times greater method. Finally, simultaneously exploited all readings found relative 30 approach.