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Proceedings Paper

Comparing different optical thermometries for use in condensed phase laser cooling
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Paper 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.

Paper Details

Date Published: 24 February 2020
PDF: 9 pages
Proc. SPIE 11298, Photonic Heat Engines: Science and Applications II, 1129803 (24 February 2020); doi: 10.1117/12.2543388
Show Author Affiliations
Zhuoming Zhang, Univ. of Notre Dame (United States)
Shubin Zhang, Univ. of Notre Dame (United States)
Maksym Zhukovskyi, Univ. of Notre Dame (United States)
Boldizsár Jankó, Univ. of Notre Dame (United States)
Masaru Kuno, Univ. of Notre Dame (United States)


Published in SPIE Proceedings Vol. 11298:
Photonic Heat Engines: Science and Applications II
Denis V. Seletskiy; Richard I. Epstein; Mansoor Sheik-Bahae, Editor(s)

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