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Lead halide perovskite nanocrystals demonstrate efficient up-conversion,although the precise mechanism remains a subject of active research. This studyutilizes steady-state and time-resolved spectroscopy methods to unravel themechanism driving the up-conversion process in CsPbBr3 nanocrystals. Employingabove- and below-gap photoluminescence measurements, we extract a distinctphonon mode with an energy of ~7 meV and identify the Pb-Br-Pb bending mode asthe phonon involved in the up-conversion process. This result was corroboratedby Raman spectroscopy. We confirm an up-conversion efficiency reaching up to75%. Transient absorption measurements under conditions of sub-gap excitationalso unexpectedly reveal coherent phonons for the subset of nanocrystalsundergoing up-conversion. This coherence implies that the up-conversion andsubsequent relaxation is accompanied by a synchronized and phased latticemotion. This study reveals that efficient up-conversion in CsPbBr3 nanocrystalsis powered by a unique interplay between the soft lattice structure, phonons,and excited states dynamics.

Efficient Up-Conversion in CsPbBr3 Nanocrystals via Phonon-Driven Exciton-Polaron Formation