Excitation Intensity-Dependent Quantum Yield of Semiconductor Nanocrystals.

Autor:	Ghosh S; Third Institute of Physics - Biophysics, Georg August University Göttingen, Friedrich-Hund Platz 1, 37077 Göttingen, Germany., Ross U; IV. Physical Institute - Solids and Nanostructures, Georg August University Göttingen, Friedrich-Hund Platz 1, 37077 Göttingen, Germany., Chizhik AM; Third Institute of Physics - Biophysics, Georg August University Göttingen, Friedrich-Hund Platz 1, 37077 Göttingen, Germany., Kuo Y; Department of Chemistry and Biochemistry, University of California Los Angeles, Los Angeles, California 90095, United States., Jeong BG; School of Chemical and Biomolecular Engineering, Pusan National University, Busan 46241, Republic of Korea., Bae WK; SKKU Advanced Institute of Nanotechnology (SAINT), Sungkyunkwan University, Suwon 16419, Republic of Korea., Park K; Korea Electronics Technology Institute, Seongnam-si, Gyeonggi-do 13509, Republic of Korea., Li J; Department of Chemistry and Biochemistry, University of California Los Angeles, Los Angeles, California 90095, United States., Oron D; Department of Molecular Chemistry and Materials Science, Weizmann Institute of Science, Rehovot 76100, Israel., Weiss S; Department of Chemistry and Biochemistry, University of California Los Angeles, Los Angeles, California 90095, United States.; California NanoSystems Institute, University of California Los Angeles, Los Angeles, California 90095, United States.; Department of Physiology, University of California Los Angeles, Los Angeles, California 90095, United States.; Department of Physics, Institute for Nanotechnology and Advanced Materials, Bar-Ilan University, Ramat-Gan, 52900, Israel., Enderlein J; Third Institute of Physics - Biophysics, Georg August University Göttingen, Friedrich-Hund Platz 1, 37077 Göttingen, Germany.; Cluster of Excellence 'Multiscale Bioimaging: from Molecular Machines to Networks of Excitable Cells,' (MBExC), Georg August University of Göttingen, Robert-Koch-Str. 40, 37075 Göttingen, Germany., Chizhik AI; Third Institute of Physics - Biophysics, Georg August University Göttingen, Friedrich-Hund Platz 1, 37077 Göttingen, Germany.
Jazyk:	angličtina
Zdroj:	The journal of physical chemistry letters [J Phys Chem Lett] 2023 Mar 16; Vol. 14 (10), pp. 2702-2707. Date of Electronic Publication: 2023 Mar 09.
DOI:	10.1021/acs.jpclett.3c00143
Abstrakt:	One of the key phenomena that determine the fluorescence of nanocrystals is the nonradiative Auger-Meitner recombination of excitons. This nonradiative rate affects the nanocrystals' fluorescence intensity, excited state lifetime, and quantum yield. Whereas most of the above properties can be directly measured, the quantum yield is the most difficult to assess. Here we place semiconductor nanocrystals inside a tunable plasmonic nanocavity with subwavelength spacing and modulate their radiative de-excitation rate by changing the cavity size. This allows us to determine absolute values of their fluorescence quantum yield under specific excitation conditions. Moreover, as expected considering the enhanced Auger-Meitner rate for higher multiple excited states, increasing the excitation rate reduces the quantum yield of the nanocrystals.
Databáze:	MEDLINE
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