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8 March 2021 Optical refrigeration with all-inorganic cesium lead halide perovskite nanocrystals
Matthew T. Sheldon
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Proceedings Volume 11702, Photonic Heat Engines: Science and Applications III; 117020D (2021) https://doi.org/10.1117/12.2591312
Event: SPIE OPTO, 2021, Online Only
Abstract
One photon up-conversion photoluminescence is an optical phenomenon whereby the thermal energy of a fluorescent material is used to increase the energy of an emitted photon compared with the energy of the photon that was absorbed. When this occurs with near unity efficiency, the emitting material undergoes a net decrease in temperature—so called optical refrigeration. Because the up-conversion is thermally activated, the yield of up-converted photoluminescence is also a reporter of the temperature of the emitter. Taking advantage of this optical signature, we have shown that cesium lead trihalide nanocrystals are cooled by as much as 66 K during the up-conversion of 532 nm CW laser excitation. Our work is the first demonstration of optical cooling of colloidal semiconductor nanocrystals, as well as a new record for optical cooling of any semiconductor system, highlighting the intrinsic advantages of colloidal nanocrystals for this goal.
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Matthew T. Sheldon "Optical refrigeration with all-inorganic cesium lead halide perovskite nanocrystals", Proc. SPIE 11702, Photonic Heat Engines: Science and Applications III, 117020D (8 March 2021); https://doi.org/10.1117/12.2591312
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KEYWORDS
Nanocrystals
Cesium
Lead
Perovskite
Luminescence
Optical cooling
Semiconductors
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