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Lanthanides in Luminescent Thermometry Chapter 281 383 FIG. 18 (A) Calibration, (B) Sr, and (C) dT curves computed for single-center (full lines) and dual-center (interrupted lines) luminescent thermometers. The cutoff at D1⁄40.01 represents the operational criterion in which reliable intensity values are only those 5% higher than the noise level. Below this limit, that corresponds to D/D0<2% and D/B<4%, in dual- and single-center thermometers, respectively, the Sr and dT values are not displayed because the thermometers are out of their operating range. delayed fluorescence (Vlaskin et al., 2010), its energy being almost resonant with that of the 5D4 level (Tb3+); this allows thermally driven depopulation with the concomitant decrease of the Tb3+ intensity as temperature increases. On the contrary, the 5D0 population is essentially constant since its relatively low energy hinders the thermally driven Eu-to-ligand back transfer. The fit of the corresponding calibration curves to Eq. (38) allows the estimation of Sr and dT for each material, according to Eqs. (40) and (41), respectively. Fig. 19 clearly points out that the feasibility of the fine-tuning of the temperature of maximum sensitivity and minimum thermal uncertainty by judicious engineering of ligands and hosts. 5 EXAMPLES There are several factors determining the suitability of a thermometer for a given application. Some of them are obviously related to the sensing perfor- mance: working range, sensitivity, uncertainty, time resolution, and spatialPDF Image | HANDBOOK ON THE PHYSICS AND CHEMISTRY OF RARE EARTHS
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