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- W3045494259 abstract "Luminescence Boltzmann thermometry is one of the most reliable techniques used to locally probe temperature in a contactless mode. However, to date, there is no report on cryogenic thermometers based on the highly sensitive and reliable Boltzmann-based 4T2 → 4A2/2E → 4A2 emission ratio of Cr3+. On the basis of structural information of the local HfO6 octahedral site we demonstrated the potential of the CaHfO3:Cr3+ system by combining deep theoretical and experimental investigation. The material exhibits simultaneous emission from both the 2E and 4T2 excited states, following the Boltzmann law in a cryogenic temperature range of 40-150 K. The promising thermometric performance corroborates the potential of CaHfO3:Cr3+ as a Boltzmann cryothermometer, being characterized by a high relative sensitivity (∼ 2%·K-1 at 40 K) and exceptional thermal resolution (0.045-0.77 K in the 40-150 K range). Moreover, by exploiting the flexibility of the 4T2-2E energy gap controlled by the crystal field of the local octahedral site, the design proposed herein could be expanded to develop new Cr3+-doped cryogenic thermometers." @default.
- W3045494259 created "2020-08-03" @default.
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- W3045494259 date "2020-07-28" @default.
- W3045494259 modified "2023-10-17" @default.
- W3045494259 title "Pushing the Limit of Boltzmann Distribution in Cr<sup>3+</sup>-Doped CaHfO<sub>3</sub> for Cryogenic Thermometry" @default.
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- W3045494259 doi "https://doi.org/10.1021/acsami.0c08965" @default.
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