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5 March 2021 On the excitation energy dependence of semiconductor nanocrystals emission quantum yields
Zhuoming Zhang, Shubin Zhang, Tianle Guo, Irina Gushchina, Maksym Zhukovskyi, Masaru Kuno
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Proceedings Volume 11702, Photonic Heat Engines: Science and Applications III; 117020G (2021) https://doi.org/10.1117/12.2578480
Event: SPIE OPTO, 2021, Online Only
Abstract
Semiconductor nanocrystals (NCs) are potential materials for verifiable demonstrations of semiconductor-based laser cooling. The key feature that makes NCs appealing for laser cooling is their near unity emission quantum yields (QYs). An unresolved issue regarding NC QYs, however, centers on the existence of an excitation energy dependent (EED) QY. Here, we study EED QYs on three NC systems, aimed at demonstrating NC-based laser cooling (CsPbBr3, CsPbI3, and CdSe/CdS core/shell NCs). We evaluate the impact of EED QYs using two approaches. The first involves direct QY measurements using an integrating sphere. The second entails photoluminescence excitation spectroscopy where changes to NC QYs with excitation energy can be assessed qualitatively.
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Zhuoming Zhang, Shubin Zhang, Tianle Guo, Irina Gushchina, Maksym Zhukovskyi, and Masaru Kuno "On the excitation energy dependence of semiconductor nanocrystals emission quantum yields", Proc. SPIE 11702, Photonic Heat Engines: Science and Applications III, 117020G (5 March 2021); https://doi.org/10.1117/12.2578480
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KEYWORDS
Semiconductors
Nanocrystals
Quantum efficiency
Semiconductor lasers
Integrating spheres
Light emitting diodes
Luminescence
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