High-Performance Pr³⁺-Doped Scandate Optical Thermometry: 200 K of Sensing Range with Relative Temperature Sensitivity above 2%·K^–1

Abstract

Nowadays, for lanthanide fluorescence thermometry, high relative temperature sensitivity (S r) and wide sensing range are urgently required in practical applications. Herein, a Pr3+-doped scandate (Pr3+:CaSc2O4) luminescent thermometer is proposed, and the related crystal-field splitting of Pr3+ ions is systematically discussed. The 4f5d-4f and 4f-4f emissions of Pr3+ ions in CaSc2O4 basically present positive and negative correlation relationships with the increase in temperature, respectively. The different changing tendencies in relation to temperature for the two kinds of transitions are mainly derived from the effects of the thermally activated trap energy levels and the crossover process between 5d and 4f energy states of Pr3+ ions and are beneficial for the enhancement of relevant temperature sensitivities. The obtained experimental results manifest that Pr3+:CaSc2O4 owns a maximum relative temperature sensitivity S r of 2.49%·K–1 (at 390 K) and a low temperature uncertainty (around 0.1 K from 275 to 490 K). Moreover, it is also able to keep a relatively high S r (not lower than 2%·K–1) over a wide temperature sensing range (∼200 K), which is more excellent than those of reported luminescent thermometric materials (∼100 K). Hence, what discussed in this study might provide a useful design perspective for the exploration and development of high-performance luminescent thermometers with a wide applicable temperature range.

Vibrationally Induced Photophysical Response of Sr2NaMg2V3O12:Eu3+ for Dual‐Mode Temperature Sensing and Safety Signs

“…Furthermore, the temperature resolution or temperature uncertainty δT , defined by the smallest temperature that can be detected in a given measurement, is calculated using the equation given bywhere represents the ratio of noise fluctuation to the maximum PL intensity and S r is the relative sensitivity. [ 50–52 ] In other words, the temperature resolution gives the accuracy of the measurement that can be obtained from a given thermometer. The values of at each temperature from 300 to 500 K are tabulated in Table S5, Supporting Information.…”

“…It is found that the temperature resolution is less than 0.2 K, which is comparable to the reported fluorescent thermometers. [ 50,51,53 ]…”

“…where δI I represents the ratio of noise fluctuation to the maximum PL intensity and S r is the relative sensitivity. [50][51][52] In other words, the temperature resolution gives the accuracy of the measurement that can be obtained from a given thermometer. The values of δI I at each temperature from 300 to 500 K are tabulated in Table S5, Supporting Information.…”

Monolithic Perovskite/Si Tandem Solar Cells: Pathways to Over 30% Efficiency

“…In experiment, there have been a few reports that achieved current densities of ≈19.7 mA cm −2 . [91,95,96] As has been discussed in previous section, current density from the perovskite top-cell can be further improved by reducing the reflection loss on the front surface (such as employing textured Si front surface) and parasitic absorption in contact materials and buffer layer. To achieve a V oc of 1.41 V, corresponding to a V oc loss of ≈0.34 V, is challenging but possible as similar V oc loss has been reported for a range of low-bandgap PSCs.…”

Recent advances in Pr3+-activated persistent phosphors

“…Based on the assumption, there are roughly two types of emission transitions in Pr 3+ , 4f 2 -4f 2 intra-configurational emission transitions and 4f5d -4f 2 inter-configurational emission transition. 42 The partially allowed electric dipole transitions of Pr 3+ within the 4f 2 configurations (from different emissive energy levels) result from uneven crystal-field terms in crystals.…”