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Frenkel N, Scharf E, Lubin G, Levi A, Panfil YE, Ossia Y, Planelles J, Climente JI, Banin U, Oron D. Two Biexciton Types Coexisting in Coupled Quantum Dot Molecules. ACS Nano 2023; 17:14990-15000. [PMID: 37459645 PMCID: PMC10416571 DOI: 10.1021/acsnano.3c03921] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/02/2023] [Accepted: 07/12/2023] [Indexed: 08/09/2023]
Abstract
Coupled colloidal quantum dot molecules (CQDMs) are an emerging class of nanomaterials, manifesting two coupled emission centers and thus introducing additional degrees of freedom for designing quantum-dot-based technologies. The properties of multiply excited states in these CQDMs are crucial to their performance as quantum light emitters, but they cannot be fully resolved by existing spectroscopic techniques. Here we study the characteristics of biexcitonic species, which represent a rich landscape of different configurations essentially categorized as either segregated or localized biexciton states. To this end, we introduce an extension of Heralded Spectroscopy to resolve the different biexciton species in the prototypical CdSe/CdS CQDM system. By comparing CQDMs with single quantum dots and with nonfused quantum dot pairs, we uncover the coexistence and interplay of two distinct biexciton species: A fast-decaying, strongly interacting biexciton species, analogous to biexcitons in single quantum dots, and a long-lived, weakly interacting species corresponding to two nearly independent excitons. The two biexciton types are consistent with numerical simulations, assigning the strongly interacting species to two excitons localized at one side of the quantum dot molecule and the weakly interacting species to excitons segregated to the two quantum dot molecule sides. This deeper understanding of multiply excited states in coupled quantum dot molecules can support the rational design of tunable single- or multiple-photon quantum emitters.
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Affiliation(s)
- Nadav Frenkel
- Department
of Physics of Complex Systems, Weizmann
Institute of Science, Rehovot 7610001, Israel
| | - Einav Scharf
- Institute
of Chemistry and the Center for Nanoscience and Nanotechnology, The Hebrew University of Jerusalem, Jerusalem 91904, Israel
| | - Gur Lubin
- Department
of Physics of Complex Systems, Weizmann
Institute of Science, Rehovot 7610001, Israel
| | - Adar Levi
- Institute
of Chemistry and the Center for Nanoscience and Nanotechnology, The Hebrew University of Jerusalem, Jerusalem 91904, Israel
| | - Yossef E. Panfil
- Institute
of Chemistry and the Center for Nanoscience and Nanotechnology, The Hebrew University of Jerusalem, Jerusalem 91904, Israel
| | - Yonatan Ossia
- Institute
of Chemistry and the Center for Nanoscience and Nanotechnology, The Hebrew University of Jerusalem, Jerusalem 91904, Israel
| | - Josep Planelles
- Departament
de Quimica Fisica i Analitica, Universitat
Jaume I, E-12080 Castello de la Plana, Spain
| | - Juan I. Climente
- Departament
de Quimica Fisica i Analitica, Universitat
Jaume I, E-12080 Castello de la Plana, Spain
| | - Uri Banin
- Institute
of Chemistry and the Center for Nanoscience and Nanotechnology, The Hebrew University of Jerusalem, Jerusalem 91904, Israel
| | - Dan Oron
- Department
of Molecular Chemistry and Materials Science, Weizmann Institute of Science, Rehovot 76100, Israel
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Kim D, Calabro RL, Masud AA, Kothalawala NL, Gu M, Kwak SY, Son WJ, Hwang KY, Choi H, Richards CI, Kim DY, Kim BS. Exploring the Role of Surface States in Emissive Carbon Nanodots: Analysis at Single-Particle Level. Chem Asian J 2021; 16:4155-4164. [PMID: 34734682 DOI: 10.1002/asia.202101087] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2021] [Revised: 11/01/2021] [Indexed: 11/11/2022]
Abstract
Fluorescent carbon nanodots (CDs) have been highlighted as promising semiconducting materials due to their outstanding chemical and optical properties. However, the intrinsic heterogeneity of CDs has impeded a clear understanding of the mechanisms behind their photophysical properties. In this study, as-prepared CDs are fractionated via chromatography to reduce their structural and chemical heterogeneity and analyzed through ensemble and single-particle spectroscopies. Many single particles reveal fluorescence intensity fluctuations between two or more discrete levels with bi-exponential decays. While the intrinsic τ1 components are uniform among single particles, the τ2 components from molecule-like emissions spans a wider range of lifetimes, reflecting the inhomogeneity of the surface states. Furthermore, it is concluded that the relative population and chemical states of surface functional groups in CDs have a significant impact on emissive states, brightness, blinking, stability, and lifetime distribution of photoluminescence.
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Affiliation(s)
- Dongseok Kim
- Department of Chemistry, Yonsei University, Seoul, 03722, Republic of Korea
| | - Rosemary L Calabro
- Department of Chemistry, University of Kentucky, 505 Rose Street, Lexington, Kentucky, 40506-0055, United States
| | - Abdullah A Masud
- Department of Chemistry, University of Kentucky, 505 Rose Street, Lexington, Kentucky, 40506-0055, United States
| | - Nadeesha L Kothalawala
- Department of Chemistry, University of Kentucky, 505 Rose Street, Lexington, Kentucky, 40506-0055, United States
| | - Minsu Gu
- Department of Chemistry, Yonsei University, Seoul, 03722, Republic of Korea.,Department of Chemical Engineering (BK21 FOUR), Dong-A University, Busan, 49315, Republic of Korea
| | - Seung-Yeon Kwak
- Samsung Advanced Institute of Technology (SAIT), Samsung Electronics Co. Ltd., Suwon, 16678, Republic of Korea
| | - Won-Joon Son
- Data and Information Technology (DIT) Center, Samsung Electronics, Hwaseong, 18448, Republic of Korea
| | - Kyu Young Hwang
- Samsung Advanced Institute of Technology (SAIT), Samsung Electronics Co. Ltd., Suwon, 16678, Republic of Korea
| | - Hyeonho Choi
- Samsung Advanced Institute of Technology (SAIT), Samsung Electronics Co. Ltd., Suwon, 16678, Republic of Korea
| | - Christopher I Richards
- Department of Chemistry, University of Kentucky, 505 Rose Street, Lexington, Kentucky, 40506-0055, United States
| | - Doo Young Kim
- Department of Chemistry, University of Kentucky, 505 Rose Street, Lexington, Kentucky, 40506-0055, United States
| | - Byeong-Su Kim
- Department of Chemistry, Yonsei University, Seoul, 03722, Republic of Korea
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Yorulmaz M, Nizzero S, Hoggard A, Wang LY, Cai YY, Su MN, Chang WS, Link S. Single-particle absorption spectroscopy by photothermal contrast. Nano Lett 2015; 15:3041-7. [PMID: 25849105 DOI: 10.1021/nl504992h] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Removing effects of sample heterogeneity through single-molecule and single-particle techniques has advanced many fields. While background free luminescence and scattering spectroscopy is widely used, recording the absorption spectrum only is rather difficult. Here we present an approach capable of recording pure absorption spectra of individual nanostructures. We demonstrate the implementation of single-particle absorption spectroscopy on strongly scattering plasmonic nanoparticles by combining photothermal microscopy with a supercontinuum laser and an innovative calibration procedure that accounts for chromatic aberrations and wavelength-dependent excitation powers. Comparison of the absorption spectra to the scattering spectra of the same individual gold nanoparticles reveals the blueshift of the absorption spectra, as predicted by Mie theory but previously not detectable in extinction measurements that measure the sum of absorption and scattering. By covering a wavelength range of 300 nm, we are furthermore able to record absorption spectra of single gold nanorods with different aspect ratios. We find that the spectral shift between absorption and scattering for the longitudinal plasmon resonance decreases as a function of nanorod aspect ratio, which is in agreement with simulations.
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Affiliation(s)
- Mustafa Yorulmaz
- †Department of Chemistry, ‡Applied Physics Graduate Program, §Department of Electrical and Computer Engineering, Laboratory for Nanophotonics, Rice University, Houston, Texas 77005, United States
| | - Sara Nizzero
- †Department of Chemistry, ‡Applied Physics Graduate Program, §Department of Electrical and Computer Engineering, Laboratory for Nanophotonics, Rice University, Houston, Texas 77005, United States
| | - Anneli Hoggard
- †Department of Chemistry, ‡Applied Physics Graduate Program, §Department of Electrical and Computer Engineering, Laboratory for Nanophotonics, Rice University, Houston, Texas 77005, United States
| | - Lin-Yung Wang
- †Department of Chemistry, ‡Applied Physics Graduate Program, §Department of Electrical and Computer Engineering, Laboratory for Nanophotonics, Rice University, Houston, Texas 77005, United States
| | - Yi-Yu Cai
- †Department of Chemistry, ‡Applied Physics Graduate Program, §Department of Electrical and Computer Engineering, Laboratory for Nanophotonics, Rice University, Houston, Texas 77005, United States
| | - Man-Nung Su
- †Department of Chemistry, ‡Applied Physics Graduate Program, §Department of Electrical and Computer Engineering, Laboratory for Nanophotonics, Rice University, Houston, Texas 77005, United States
| | - Wei-Shun Chang
- †Department of Chemistry, ‡Applied Physics Graduate Program, §Department of Electrical and Computer Engineering, Laboratory for Nanophotonics, Rice University, Houston, Texas 77005, United States
| | - Stephan Link
- †Department of Chemistry, ‡Applied Physics Graduate Program, §Department of Electrical and Computer Engineering, Laboratory for Nanophotonics, Rice University, Houston, Texas 77005, United States
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