Comparing different optical thermometries for use in condensed phase laser cooling

Zhuoming Zhang; Shubin Zhang; Maksym Zhukovskyi; Boldizsár Jankó; Masaru Kuno

doi:10.1117/12.2543388

24 February 2020 Comparing different optical thermometries for use in condensed phase laser cooling

Zhuoming Zhang, Shubin Zhang, Maksym Zhukovskyi, Boldizsár Jankó, Masaru Kuno

Proceedings Volume 11298, Photonic Heat Engines: Science and Applications II; 1129803 (2020) https://doi.org/10.1117/12.2543388
Event: SPIE OPTO, 2020, San Francisco, California, United States

Abstract

Establishing the optical refrigeration of semiconductors remains a longstanding goal due to potential applications in optoelectronics. Apart from stringent materials requirements, required to realize condensed phase laser cooling, namely the need to have near unity emission quantum yields, a practical challenge involves accurately measuring specimen temperatures in a non-contact fashion. Common all-optical approaches developed in response to this need include: pump– probe luminescence thermometry (PPLT) and differential luminescence thermometry (DLT). In this study, we compare and contrast PPLT and DLT to a newly developed up-conversion emission thermometry to establish the most robust approach for measuring semiconductor nanocrystal (NC) temperatures. Using high external quantum efficiency CdSe/CdS core/shell NCs, we reveal that up-conversion emission thermometry possesses higher accuracy than either PPLT or DLT. Up-conversion emission thermometry can also be used on specimens such as CsPbBr₃ NCs with temperature-insensitive band gaps.

Conference Presentation

Citation Download Citation

Zhuoming Zhang, Shubin Zhang, Maksym Zhukovskyi, Boldizsár Jankó, and Masaru Kuno "Comparing different optical thermometries for use in condensed phase laser cooling", Proc. SPIE 11298, Photonic Heat Engines: Science and Applications II, 1129803 (24 February 2020); https://doi.org/10.1117/12.2543388

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