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CsPbBr3 perovskite nanocrystals have been identified as a potential medium to realize condensed phase optical refrigeration. This is due to its near unity emission quantum yields and efficient anti-Stokes photoluminescence (ASPL). Despite much work on CsPbBr3’s optical response, the origin of its efficient ASPL remains unclear. We conduct detailed optical spectroscopy measurements in conjunction with theory to establish mechanistic insights into CsPbBr3’s up-conversion process. Experimental techniques utilized include: temperature-dependent and detuning energy-dependent ASPL measurements, temperature-tunable photothermal heterodyne absorption spectroscopy, and ultrafast transient differential absorption (TDA) spectroscopy.
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