Optically Cooling Cesium Lead Tribromide Nanocrystals

Nano Letters
Benjamin J RomanMatthew Sheldon

Abstract

One photon up-conversion photoluminescence is an optical phenomenon whereby the thermal energy of a fluorescent material increases 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 cooling. Because the up-conversion mechanism 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, cesium lead trihalide nanocrystals are shown to cool during the up-conversion of 532 nm CW laser excitation. Raman thermometric analysis of a substrate on which the nanocrystals were deposited further verifies the decrease in the local environmental temperature by as much as 25 °C during optical pumping. This is the first demonstration of optical cooling driven by colloidal semiconductor nanocrystal up-conversion.

References

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Jan 25, 2013·Nature·Jun ZhangQihua Xiong
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Apr 28, 2017·Journal of the American Chemical Society·Brent A KoscherA Paul Alivisatos
May 8, 2018·Chemical Communications : Chem Comm·Benjamin J Roman, Matthew Sheldon

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