The role of surface polarons for single-photon up-conversion in CsPbBr3 perovskite nanocrystals

Matthew T. Sheldon

doi:10.1117/12.3010144

13 March 2024 The role of surface polarons for single-photon up-conversion in CsPbBr₃ perovskite nanocrystals

Matthew T. Sheldon

Proceedings Volume PC12902, Photonic Heat Engines: Science and Applications VI; PC129020A (2024) https://doi.org/10.1117/12.3010144
Event: SPIE OPTO, 2024, San Francisco, California, United States

Abstract

CsPbBr3 perovskite nanocrystals (CsPbBr3 NCs) have emerged as a promising materials system to explore for optical cooling technologies, attributed to their pronounced anti-stokes photoluminescence (ASPL) and near unity photoluminescence quantum yield (PLQY). However, the details of their up-conversion mechanism remain unclear. Our research probed the activation energy of up-conversion (Ea) during temperature-dependent luminescent studies, and its correlation with the up-converted frequency shift (ΔE). The findings highlight the influence of surface polaron states. Notably, an energy of rearrangement (ER) was identified, which is modulated by the ligand coverage on the NCs, as well as several other factors. This work informs advances in material design for optical cooling applications.

Conference Presentation

Citation Download Citation

Matthew T. Sheldon "The role of surface polarons for single-photon up-conversion in CsPbBr₃ perovskite nanocrystals", Proc. SPIE PC12902, Photonic Heat Engines: Science and Applications VI, PC129020A (13 March 2024); https://doi.org/10.1117/12.3010144

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