Photonic design for optical cooling with perovskite nanocrystals

CsPbBr3 perovskite nanocrystals (NCs) have emerged as promising materials for optical cooling due to their pronounced anti-Stokes photoluminescence (ASPL) and high photoluminescence quantum yield (PLQY). This presentation describes recent progress in integrating NCs within photonic architectures to enhance optical cooling by identifying and manipulating rate-limiting steps in phonon-assisted ASPL. We developed platforms coupling NCs with nanostructured metal architectures, leveraging plasmonics for enhanced light-matter interactions. Optimal geometries were identified for increasing absorption cross-section and integrating NC superlattices to accelerate radiative recombination. Preliminary studies using photothermal deflection spectroscopy (PTD) and FTIR microscopy indicate greater optical cooling with resonant plasmonic arrays. This work advances understanding of perovskite optical cooling mechanisms for improved thermal management in optical refrigeration schemes.