Anti-Stokes photoluminescence in CsPbBr3 caused by resonant multiple-phonon absorption

Sushrut Ghonge; Zhuoming Zhang; Yang Ding; Shubin Zhang; Mona Berciu; Richard D. Schaller; Masaru K. Kuno; Boldizsar Janko

doi:10.1117/12.3010446

13 March 2024 Anti-Stokes photoluminescence in CsPbBr₃caused by resonant multiple-phonon absorption

Sushrut Ghonge, Zhuoming Zhang, Yang Ding, Shubin Zhang, Mona Berciu, Richard D. Schaller, Masaru K. Kuno, Boldizsar Janko

Author Affiliations +

Proceedings Volume PC12902, Photonic Heat Engines: Science and Applications VI; PC1290208 (2024) https://doi.org/10.1117/12.3010446
Event: SPIE OPTO, 2024, San Francisco, California, United States

Abstract

Cesium lead bromide nanocrystals, in contrast to most other materials, exhibit near-unity photoluminescence quantum yields (PLQY). When excited below the band gap, they absorb the photons and show anti-Stokes photoluminescence (ASPL), emitting higher energy, band-gap photons. Simultaneous existence of near-unity PLQY and ASPL can be used to optically cool these materials. In this talk, I will report near-unity ASPL efficiencies in CsPbBr₃ nanocrystals and attribute it to resonant multiple-phonon absorption by polarons. The theory explains paradoxically large efficiencies for intrinsically disfavored, multiple-phonon-assisted ASPL in nanocrystals.

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Sushrut Ghonge, Zhuoming Zhang, Yang Ding, Shubin Zhang, Mona Berciu, Richard D. Schaller, Masaru K. Kuno, and Boldizsar Janko "Anti-Stokes photoluminescence in CsPbBr₃caused by resonant multiple-phonon absorption ", Proc. SPIE PC12902, Photonic Heat Engines: Science and Applications VI, PC1290208 (13 March 2024); https://doi.org/10.1117/12.3010446

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