1
|
Demirkurt B, Petrova D, Sharma DK, Vacha M, Weber B, Bonn D, Brouwer AM. Resolving Multi-Asperity Contacts at the Nanoscale through Super-Resolution Fluorescence Imaging. J Phys Chem Lett 2024; 15:1936-1942. [PMID: 38346098 PMCID: PMC10895690 DOI: 10.1021/acs.jpclett.3c02799] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2023] [Revised: 02/02/2024] [Accepted: 02/06/2024] [Indexed: 02/23/2024]
Abstract
Contact mechanics, spanning nanometer to tectonic scales, faces long-standing challenges arising from multiscale random roughness, which hinders experimental validation of theories. Understanding multi-asperity rough contacts is vital for addressing catastrophic consequences of these contacts failing such as earthquakes and for diverse technological applications. To visualize such contacts, we introduce a super-resolution microscopy method utilizing spontaneous millisecond ON/OFF fluorescence blinking of contact-sensitive molecular rotor molecules immobilized on a glass coverslip. This technique achieves ∼55 nm lateral imaging resolution for rough poly(methyl methacrylate) and glass spheres on glass contacts. For soft polymer spheres due to large plastic deformation, the resolution improvement does not significantly affect the area of real contact. However, for hard glass spheres, the real contact area is found to be 2.4 times smaller than that found by diffraction-limited imaging. This study highlights, through direct visualization, the impact of material stiffness on the nanoscale structure within the area of real contact.
Collapse
Affiliation(s)
- Begüm Demirkurt
- van't Hoff Institute for Molecular Sciences, University of Amsterdam, P.O. Box 94157, 1090 GD Amsterdam, The Netherlands
| | - Dina Petrova
- van't Hoff Institute for Molecular Sciences, University of Amsterdam, P.O. Box 94157, 1090 GD Amsterdam, The Netherlands
| | | | - Martin Vacha
- Tokyo Institute of Technology, Ookayama 2-12-1-S8, Meguro-ku, Tokyo 152-8552, Japan
| | - Bart Weber
- Advanced Research Center for Nanolithography (ARCNL), Science Park 106, 1098 XG Amsterdam, The Netherlands
- Institute of Physics, University of Amsterdam, P.O. Box 94485, 1090 GL Amsterdam, The Netherlands
| | - Daniel Bonn
- Institute of Physics, University of Amsterdam, P.O. Box 94485, 1090 GL Amsterdam, The Netherlands
| | - Albert M Brouwer
- van't Hoff Institute for Molecular Sciences, University of Amsterdam, P.O. Box 94157, 1090 GD Amsterdam, The Netherlands
| |
Collapse
|
2
|
Mazal H, Wieser FF, Sandoghdar V. Insights into protein structure using cryogenic light microscopy. Biochem Soc Trans 2023; 51:2041-2059. [PMID: 38015555 PMCID: PMC10754291 DOI: 10.1042/bst20221246] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2023] [Revised: 11/13/2023] [Accepted: 11/14/2023] [Indexed: 11/29/2023]
Abstract
Fluorescence microscopy has witnessed many clever innovations in the last two decades, leading to new methods such as structured illumination and super-resolution microscopies. The attainable resolution in biological samples is, however, ultimately limited by residual motion within the sample or in the microscope setup. Thus, such experiments are typically performed on chemically fixed samples. Cryogenic light microscopy (Cryo-LM) has been investigated as an alternative, drawing on various preservation techniques developed for cryogenic electron microscopy (Cryo-EM). Moreover, this approach offers a powerful platform for correlative microscopy. Another key advantage of Cryo-LM is the strong reduction in photobleaching at low temperatures, facilitating the collection of orders of magnitude more photons from a single fluorophore. This results in much higher localization precision, leading to Angstrom resolution. In this review, we discuss the general development and progress of Cryo-LM with an emphasis on its application in harnessing structural information on proteins and protein complexes.
Collapse
Affiliation(s)
- Hisham Mazal
- Max Planck Institute for the Science of Light, 91058 Erlangen, Germany
- Max-Planck-Zentrum für Physik und Medizin, 91058 Erlangen, Germany
| | - Franz-Ferdinand Wieser
- Max Planck Institute for the Science of Light, 91058 Erlangen, Germany
- Max-Planck-Zentrum für Physik und Medizin, 91058 Erlangen, Germany
- Friedrich-Alexander University of Erlangen-Nürnberg, 91058 Erlangen, Germany
| | - Vahid Sandoghdar
- Max Planck Institute for the Science of Light, 91058 Erlangen, Germany
- Max-Planck-Zentrum für Physik und Medizin, 91058 Erlangen, Germany
- Friedrich-Alexander University of Erlangen-Nürnberg, 91058 Erlangen, Germany
| |
Collapse
|
3
|
Das AK, Mandal AK, Mondal T. Probing Single-molecule Interfacial Electron Transfer Inside a Single Lipid Vesicle. J Fluoresc 2023; 33:2229-2239. [PMID: 37004622 DOI: 10.1007/s10895-023-03211-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2022] [Accepted: 03/13/2023] [Indexed: 04/04/2023]
Abstract
Inhomogeneity in single molecule electron transfer at the surface of lipid in a single vesicle has been explored by single molecule spectroscopic technique. In our study we took Di-methyl aniline (DMA), as the electron donor (D) and three different organic dyes as acceptor. These dyes are C153, C480 and C152 and they reside in different regions in the vesicle depending upon their preference of residence. For each probe, we found fluctuations in the single-molecule fluorescence decay, which are attributed to the variation in the reactivity of interfacial electron transfer. We found a non-exponential auto-correlation fluctuation of the intensity of the probe, which is ascribed to the kinetic disorder in the rate of electron transfer. We have also shown the power law distribution of the dark state (off time), which obeys the levy's statistics. We found a shift in lifetime distribution for the probe (C153) from 3.9 ns to 3.5 ns. This observed quenching is due to the dynamic electron transfer. We observed the kinetic disorderness in the electron transfer reaction for each dye. This source of fluctuation in electron transfer rate may be ascribed to the inherent fluctuation, occurring on the time scale of ~ 1.1 ms (for C153) of the vesicle, containing lipids.
Collapse
Affiliation(s)
- Atanu Kumar Das
- Department of Physics, Kandi Raj College, Murshidabad, West Bengal, 742137, India
| | - Amit Kumar Mandal
- Department of Chemistry, Bankura University, Bankura, West Bengal, 722155, India
| | - Tridib Mondal
- Department of Chemistry, Sukanta Mahavidyalaya, Jalpaiguri, West Bengal, 735210, India.
| |
Collapse
|
4
|
Chandrasiri HB, Jing H, Perera T, Hu YS, Snee PT. Fluorescence Intermittency of Quantum Dot-Organic Dye Conjugates: Implications for Alternative Energy and Biological Imaging. J Phys Chem Lett 2023; 14:3621-3626. [PMID: 37023397 DOI: 10.1021/acs.jpclett.3c00076] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/19/2023]
Abstract
Quantum dot (QD)-organic dye couple chromophores are topical due to their applications in biology, catalysis, and energy. The maximization of energy transfer efficiency can be guided by the underlying Förster or Dexter mechanisms; however, the impact of fluorescence intermittency must also be considered. Here we demonstrate that the average ⟨ton⟩ and ⟨toff⟩ times of dye acceptors in coupled QD-dye chromophores are substantially affected by the donors' blinking behavior. With regard to biological imaging, this effect beneficially minimizes the photobleaching of the acceptor dye. The implications for alternative energy are less encouraging as the acceptors' capacity to store energy, using ⟨ton⟩/⟨toff⟩ as a metric, was reduced by as much as ∼95%. These detrimental effects can be mitigated by suppressing QD blinking via surface treatment. This study also demonstrates several instances of the nonconformity of QD blinking dynamics to a power law distribution, as a robust examination of the off times reveals log-normal behavior that is consistent with the Albery model.
Collapse
Affiliation(s)
- Hashini B Chandrasiri
- Department of Chemistry, College of Liberal Arts & Sciences, University of Illinois, Chicago, Chicago, Illinois 60607-7061, United States
| | - Haoran Jing
- Department of Chemistry, College of Liberal Arts & Sciences, University of Illinois, Chicago, Chicago, Illinois 60607-7061, United States
| | - Thilini Perera
- Department of Chemistry, College of Liberal Arts & Sciences, University of Illinois, Chicago, Chicago, Illinois 60607-7061, United States
| | - Ying S Hu
- Department of Chemistry, College of Liberal Arts & Sciences, University of Illinois, Chicago, Chicago, Illinois 60607-7061, United States
| | - Preston T Snee
- Department of Chemistry, College of Liberal Arts & Sciences, University of Illinois, Chicago, Chicago, Illinois 60607-7061, United States
| |
Collapse
|
5
|
Measuring 3D orientation of nanocrystals via polarized luminescence of rare-earth dopants. Nat Commun 2021; 12:1943. [PMID: 33782386 PMCID: PMC8007814 DOI: 10.1038/s41467-021-22158-4] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2020] [Accepted: 02/23/2021] [Indexed: 11/19/2022] Open
Abstract
Orientation of nanoscale objects can be measured by examining the polarized emission of optical probes. To retrieve a three-dimensional (3D) orientation, it has been essential to observe the probe (a dipole) along multiple viewing angles and scan with a rotating analyzer. However, this method requires a sophisticated optical setup and is subject to various external sources of error. Here, we present a fundamentally different approach employing coupled multiple emission dipoles that are inherent in lanthanide-doped phosphors. Simultaneous observation of different dipoles and comparison of their relative intensities allow to determine the 3D orientation from a single viewing angle. Moreover, the distinct natures of electric and magnetic dipoles originating in lanthanide luminescence enable an instant orientation analysis with a single-shot emission spectrum. We demonstrate a straightforward orientation analysis of Eu3+-doped NaYF4 nanocrystals using a conventional fluorescence microscope. Direct imaging of the rod-shaped nanocrystals proved the high accuracy of the measurement. This methodology would provide insights into the mechanical behaviors of various nano- and biomolecular systems. Determining the orientation of nanoscale objects in three-dimensional space has typically required complicated optical setups. Here, the authors develop a simple method to retrieve the 3D orientation of luminescent, lanthanide-doped nanorods from a single-shot emission spectrum.
Collapse
|
6
|
Chen W, Gan Z, Green MA, Jia B, Wen X. Revealing Dynamic Effects of Mobile Ions in Halide Perovskite Solar Cells Using Time-Resolved Microspectroscopy. SMALL METHODS 2021; 5:e2000731. [PMID: 34927806 DOI: 10.1002/smtd.202000731] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/18/2020] [Revised: 09/21/2020] [Indexed: 06/14/2023]
Abstract
Halide perovskites are promising candidate materials for the next generation high-efficiency optoelectronic devices. Since perovskites are electronic-ionic mixed conductors, ion dynamics have a critical impact on the performance and stability of perovskite-based applications. However, comprehensively understanding ionic dynamics is challenging, particularly on nanoscale imaging of ionic dynamics in perovskites. In this review, mobile ion dynamics in halide perovskites investigated via luminescence spectroscopy combined with confocal microscopy are discussed, including mobile ion induced fluorescence quenching, phase segregation in mixed halide hybrid perovskite, and mobile ion accumulation at the interface in perovskite devices. Steady-state and time-resolved luminescence imaging techniques, combined with confocal microscopy, are unique tools for probing ionic dynamics in perovskites, providing invaluable insights on ionic dynamics in nanoscale resolution, along with a wide temporal range from picoseconds to hours. The works in this review are not only for understanding mobile ions to improve the design of perovskite-based devices but also foster the development of microspectroscopic methodologies in a broader solid-state physics context of investigating ionic transports in polycrystalline materials.
Collapse
Affiliation(s)
- Weijian Chen
- Centre for Translational Atomaterials, Swinburne University of Technology, Hawthorn, VIC, 3122, Australia
- Australian Centre for Advanced Photovoltaics, School of Photovoltaic and Renewable Energy Engineering, University of New South Wales (UNSW), Kensington, NSW, 2052, Australia
| | - Zhixing Gan
- Center for Future Optoelectronic Functional Materials, School of Computer and Electronic Information/School of Artificial Intelligence, Nanjing Normal University, Nanjing, 210023, P. R. China
- College of Materials Science and Engineering, Qingdao University of Science and Technology, Qingdao, 266042, P. R. China
| | - Martin A Green
- Australian Centre for Advanced Photovoltaics, School of Photovoltaic and Renewable Energy Engineering, University of New South Wales (UNSW), Kensington, NSW, 2052, Australia
| | - Baohua Jia
- Centre for Translational Atomaterials, Swinburne University of Technology, Hawthorn, VIC, 3122, Australia
| | - Xiaoming Wen
- Centre for Translational Atomaterials, Swinburne University of Technology, Hawthorn, VIC, 3122, Australia
| |
Collapse
|
7
|
Godiksen R, Wang S, Raziman TV, Guimaraes MHD, Rivas JG, Curto AG. Correlated Exciton Fluctuations in a Two-Dimensional Semiconductor on a Metal. NANO LETTERS 2020; 20:4829-4836. [PMID: 32559090 PMCID: PMC7349615 DOI: 10.1021/acs.nanolett.0c00756] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/20/2020] [Revised: 06/18/2020] [Indexed: 06/02/2023]
Abstract
Excitons in nanoscale materials can exhibit fluorescence fluctuations. Intermittency is pervasive in zero-dimensional emitters such as single molecules and quantum dots. In contrast, two-dimensional semiconductors are generally regarded as stable light sources. Noise contains, however, valuable information about a material. Here, we demonstrate fluorescence fluctuations in a monolayer semiconductor due to sensitivity to its nanoscopic environment focusing on the case of a metal film. The fluctuations are spatially correlated over tens of micrometers and follow power-law statistics, with simultaneous changes in emission intensity and lifetime. At low temperatures, an additional spectral contribution from interface trap states emerges with fluctuations that are correlated with neutral excitons and anticorrelated with trions. Mastering exciton fluctuations has implications for light-emitting devices such as single-photon sources and could lead to novel excitonic sensors. The quantification of fluorescence fluctuations, including imaging, unlocks a set of promising tools to characterize and exploit two-dimensional semiconductors and their interfaces.
Collapse
Affiliation(s)
- Rasmus
H. Godiksen
- Department
of Applied Physics, Eindhoven University
of Technology, 5600MB Eindhoven, The Netherlands
- Institute
for Photonic Integration, Eindhoven University
of Technology, 5600MB Eindhoven, The Netherlands
| | - Shaojun Wang
- Department
of Applied Physics, Eindhoven University
of Technology, 5600MB Eindhoven, The Netherlands
- Institute
for Photonic Integration, Eindhoven University
of Technology, 5600MB Eindhoven, The Netherlands
- Dutch
Institute for Fundamental Energy Research, 5612AJ Eindhoven, The Netherlands
| | - T. V. Raziman
- Department
of Applied Physics, Eindhoven University
of Technology, 5600MB Eindhoven, The Netherlands
- Institute
for Photonic Integration, Eindhoven University
of Technology, 5600MB Eindhoven, The Netherlands
| | - Marcos H. D. Guimaraes
- Department
of Applied Physics, Eindhoven University
of Technology, 5600MB Eindhoven, The Netherlands
- Zernike
Institute for Advanced Materials, University
of Groningen, 9747AG Groningen, The Netherlands
| | - Jaime Gómez Rivas
- Department
of Applied Physics, Eindhoven University
of Technology, 5600MB Eindhoven, The Netherlands
- Institute
for Photonic Integration, Eindhoven University
of Technology, 5600MB Eindhoven, The Netherlands
- Dutch
Institute for Fundamental Energy Research, 5612AJ Eindhoven, The Netherlands
| | - Alberto G. Curto
- Department
of Applied Physics, Eindhoven University
of Technology, 5600MB Eindhoven, The Netherlands
- Institute
for Photonic Integration, Eindhoven University
of Technology, 5600MB Eindhoven, The Netherlands
| |
Collapse
|
8
|
Pfeiffer M, Senkovskiy BV, Haberer D, Fischer FR, Yang F, Meerholz K, Ando Y, Grüneis A, Lindfors K. Observation of Room-Temperature Photoluminescence Blinking in Armchair-Edge Graphene Nanoribbons. NANO LETTERS 2018; 18:7038-7044. [PMID: 30336056 DOI: 10.1021/acs.nanolett.8b03006] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
By enhancing the photoluminescence from aligned seven-atom wide armchair-edge graphene nanoribbons using plasmonic nanoantennas, we are able to observe blinking of the emission. The on- and off-times of the blinking follow power law statistics. In time-resolved spectra, we observe spectral diffusion. These findings together are a strong indication of the emission originating from a single quantum emitter. The room temperature photoluminescence displays a narrow spectral width of less than 50 meV, which is significantly smaller than the previously observed ensemble line width of 0.8 eV. From spectral time traces, we identify three optical transitions, which are energetically situated below the lowest bulk excitonic state E11 of the nanoribbons. We attribute the emission to transitions involving Tamm states localized at the end of the nanoribbon. The photoluminescence from a single ribbon is strongly enhanced when its end is in the antenna hot spot resulting in the observed single molecule characteristics of the emission. Our findings illustrate the essential role of the end termination of graphene nanoribbons in light emission and allow us to construct a model for photoluminescence from nanoribbons.
Collapse
Affiliation(s)
- Markus Pfeiffer
- Department für Chemie , Universität zu Köln , Luxemburger Strasse 116 , 50939 Köln , Germany
| | - Boris V Senkovskiy
- II. Physikalisches Institut , Universität zu Köln , Zülpicher Strasse 77 , 50937 Köln , Germany
| | - Danny Haberer
- Department of Chemistry , University of California at Berkeley , Tan Hall 680 , Berkeley , California 94720 , United States
| | - Felix R Fischer
- Department of Chemistry , University of California at Berkeley , Tan Hall 680 , Berkeley , California 94720 , United States
| | - Fan Yang
- II. Physikalisches Institut , Universität zu Köln , Zülpicher Strasse 77 , 50937 Köln , Germany
| | - Klaus Meerholz
- Department für Chemie , Universität zu Köln , Luxemburger Strasse 116 , 50939 Köln , Germany
| | - Yoichi Ando
- II. Physikalisches Institut , Universität zu Köln , Zülpicher Strasse 77 , 50937 Köln , Germany
| | - Alexander Grüneis
- II. Physikalisches Institut , Universität zu Köln , Zülpicher Strasse 77 , 50937 Köln , Germany
| | - Klas Lindfors
- Department für Chemie , Universität zu Köln , Luxemburger Strasse 116 , 50939 Köln , Germany
| |
Collapse
|
9
|
Goychuk I. Sensing Magnetic Fields with Magnetosensitive Ion Channels. SENSORS (BASEL, SWITZERLAND) 2018; 18:E728. [PMID: 29495645 PMCID: PMC5877195 DOI: 10.3390/s18030728] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/25/2018] [Revised: 02/13/2018] [Accepted: 02/13/2018] [Indexed: 12/23/2022]
Abstract
[-15]Magnetic nanoparticles are met across many biological species ranging from magnetosensitive bacteria, fishes, bees, bats, rats, birds, to humans. They can be both of biogenetic origin and due to environmental contamination, being either in paramagnetic or ferromagnetic state. The energy of such naturally occurring single-domain magnetic nanoparticles can reach up to 10-20 room k B T in the magnetic field of the Earth, which naturally led to supposition that they can serve as sensory elements in various animals. This work explores within a stochastic modeling framework a fascinating hypothesis of magnetosensitive ion channels with magnetic nanoparticles serving as sensory elements, especially, how realistic it is given a highly dissipative viscoelastic interior of living cells and typical sizes of nanoparticles possibly involved.
Collapse
Affiliation(s)
- Igor Goychuk
- Institute of Physics and Astronomy, University of Potsdam, Karl-Liebknecht-Str. 24/25, 14476 Potsdam-Golm, Germany.
| |
Collapse
|
10
|
Mitsui M, Unno A, Mori K. Methodology for Discriminating between Competitive Photophysical Processes in Photoblinking: Application to the Fluorescence Blinking of Single Dye Molecules Adsorbed on TiO2. CHEM LETT 2017. [DOI: 10.1246/cl.170127] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Affiliation(s)
- Masaaki Mitsui
- Department of Chemistry, College of Science, Rikkyo University, 3-34-1 Nishiikebukuro, Toshima-ku, Tokyo 171-8501
| | - Aki Unno
- Department of Chemistry, College of Science, Rikkyo University, 3-34-1 Nishiikebukuro, Toshima-ku, Tokyo 171-8501
| | - Kyosuke Mori
- Department of Chemistry, College of Science, Rikkyo University, 3-34-1 Nishiikebukuro, Toshima-ku, Tokyo 171-8501
| |
Collapse
|
11
|
Mishra N, Orfield NJ, Wang F, Hu Z, Krishnamurthy S, Malko AV, Casson JL, Htoon H, Sykora M, Hollingsworth JA. Using shape to turn off blinking for two-colour multiexciton emission in CdSe/CdS tetrapods. Nat Commun 2017; 8:15083. [PMID: 28497776 PMCID: PMC5437295 DOI: 10.1038/ncomms15083] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2016] [Accepted: 02/23/2017] [Indexed: 01/07/2023] Open
Abstract
Semiconductor nanostructures capable of emitting from two excited states and thereby of producing two photoluminescence colours are of fundamental and potential technological significance. In this limited class of nanocrystals, CdSe/CdS core/arm tetrapods exhibit the unusual trait of two-colour (red and green) multiexcitonic emission, with green emission from the CdS arms emerging only at high excitation fluences. Here we show that by synthetic shape-tuning, both this multi-colour emission process, and blinking and photobleaching behaviours of single tetrapods can be controlled. Specifically, we find that the properties of dual emission and single-nanostructure photostability depend on different structural parameters—arm length and arm diameter, respectively—but that both properties can be realized in the same nanostructure. Furthermore, based on results of correlated photoluminescence and transient absorption measurements, we conclude that hole-trap filling in the arms and partial state-filling in the core are necessary preconditions for the observation of multiexciton multi-colour emission. CdSe/CdS tetrapods exhibit the unusual trait of two-colour multiexcitonic emission. Here Mishra et al. study this type of dual emission at the single-nanocrystal level. By tuning arm diameter and length they seek to understand shape-dependent evolution of the emission and of blinking behaviour.
Collapse
Affiliation(s)
- Nimai Mishra
- Materials Physics and Applications Division, Center for Integrated Nanotechnologies, Los Alamos National Laboratory, PO Box 1663, MS-K771, Los Alamos, New Mexico 87545, USA
| | - Noah J Orfield
- Materials Physics and Applications Division, Center for Integrated Nanotechnologies, Los Alamos National Laboratory, PO Box 1663, MS-K771, Los Alamos, New Mexico 87545, USA
| | - Feng Wang
- Materials Physics and Applications Division, Center for Integrated Nanotechnologies, Los Alamos National Laboratory, PO Box 1663, MS-K771, Los Alamos, New Mexico 87545, USA
| | - Zhongjian Hu
- Materials Physics and Applications Division, Center for Integrated Nanotechnologies, Los Alamos National Laboratory, PO Box 1663, MS-K771, Los Alamos, New Mexico 87545, USA
| | - Sachidananda Krishnamurthy
- Materials Physics and Applications Division, Center for Integrated Nanotechnologies, Los Alamos National Laboratory, PO Box 1663, MS-K771, Los Alamos, New Mexico 87545, USA.,Department of Physics, The University of Texas at Dallas, Richardson, Texas 75080, USA
| | - Anton V Malko
- Department of Physics, The University of Texas at Dallas, Richardson, Texas 75080, USA
| | - Joanna L Casson
- Chemistry Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
| | - Han Htoon
- Materials Physics and Applications Division, Center for Integrated Nanotechnologies, Los Alamos National Laboratory, PO Box 1663, MS-K771, Los Alamos, New Mexico 87545, USA
| | - Milan Sykora
- Chemistry Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
| | - Jennifer A Hollingsworth
- Materials Physics and Applications Division, Center for Integrated Nanotechnologies, Los Alamos National Laboratory, PO Box 1663, MS-K771, Los Alamos, New Mexico 87545, USA
| |
Collapse
|
12
|
Mitsui M, Fukui H, Takahashi R, Takakura Y, Mizukami T. Single-Molecule Fluorescence Spectroscopy of Perylene Diimide Dyes in a γ-Cyclodextrin Film: Manifestation of Photoinduced H-Atom Transfer via Higher Triplet (n, π*) Excited States. J Phys Chem A 2017; 121:1577-1586. [DOI: 10.1021/acs.jpca.6b11353] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Masaaki Mitsui
- Department
of Chemistry, College of Science, Rikkyo University, 3-34-1, Nishiikebukuro, Toshima-ku, Tokyo 171-8501, Japan
| | - Hiroki Fukui
- Department
of Chemistry, Faculty of Science, Shizuoka University, 836 Ohya, Suruga-ku, Shizuoka 422-8529, Japan
| | - Ryoya Takahashi
- Department
of Chemistry, Faculty of Science, Shizuoka University, 836 Ohya, Suruga-ku, Shizuoka 422-8529, Japan
| | - Yasushi Takakura
- Department
of Chemistry, College of Science, Rikkyo University, 3-34-1, Nishiikebukuro, Toshima-ku, Tokyo 171-8501, Japan
| | - Toshinari Mizukami
- Department
of Chemistry, College of Science, Rikkyo University, 3-34-1, Nishiikebukuro, Toshima-ku, Tokyo 171-8501, Japan
| |
Collapse
|
13
|
Kennes K, Dedecker P, Hutchison JA, Fron E, Uji-i H, Hofkens J, Van der Auweraer M. Field-Controlled Charge Separation in a Conductive Matrix at the Single-Molecule Level: Toward Controlling Single-Molecule Fluorescence Intermittency. ACS OMEGA 2016; 1:1383-1392. [PMID: 30023508 PMCID: PMC6044678 DOI: 10.1021/acsomega.6b00207] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/25/2016] [Accepted: 11/09/2016] [Indexed: 06/07/2023]
Abstract
The fluorescence intermittency or "blinking" of single molecules of ATTO647N (ATTO) in the conductive matrix polyvinylcarbazole (PVK) is described in the presence of an external applied electric field. It is shown that due to the energy distribution of the highest occupied molecular orbital (HOMO) level of PVK, which is energetically close to the HOMO of ATTO, sporadic electron transfer occurs. As a result, the on/off dynamics of blinking can be influenced by the electric field. This field will, depending on the respective position and orientation of the dye/polymer system with respect to those of the electrodes, either enhance or suppress electron transfer from PVK to ATTO as well as the back electron transfer from reduced ATTO to PVK. After the charge-transfer step, the applied field will pull the hole in PVK away from the dye, increasing the overall time the dye resides in a dark state.
Collapse
Affiliation(s)
- Koen Kennes
- Molecular
Imaging and Photonics, Department of Chemistry, Katholieke Universiteit Leuven, Celestijnenlaan 200F, Leuven 3001, Belgium
| | - Peter Dedecker
- Molecular
Imaging and Photonics, Department of Chemistry, Katholieke Universiteit Leuven, Celestijnenlaan 200F, Leuven 3001, Belgium
| | - James A. Hutchison
- ISIS
& icFRC, University of Strasbourg and
CNRS UMR 7006, 8 allée
Gaspard Monge, Strasbourg 67000, France
- School
of Chemistry and Bio21 Institute, University
of Melbourne, Melbourne, Victoria 3010, Australia
| | - Eduard Fron
- Molecular
Imaging and Photonics, Department of Chemistry, Katholieke Universiteit Leuven, Celestijnenlaan 200F, Leuven 3001, Belgium
| | - Hiroshi Uji-i
- Molecular
Imaging and Photonics, Department of Chemistry, Katholieke Universiteit Leuven, Celestijnenlaan 200F, Leuven 3001, Belgium
- RIES, Hokkaido
University, N20W10, Kita-Ward, Sapporo 001-0020, Japan
| | - Johan Hofkens
- Molecular
Imaging and Photonics, Department of Chemistry, Katholieke Universiteit Leuven, Celestijnenlaan 200F, Leuven 3001, Belgium
- RIES, Hokkaido
University, N20W10, Kita-Ward, Sapporo 001-0020, Japan
| | - Mark Van der Auweraer
- Molecular
Imaging and Photonics, Department of Chemistry, Katholieke Universiteit Leuven, Celestijnenlaan 200F, Leuven 3001, Belgium
| |
Collapse
|
14
|
Ball DA, Mehta GD, Salomon-Kent R, Mazza D, Morisaki T, Mueller F, McNally JG, Karpova TS. Single molecule tracking of Ace1p in Saccharomyces cerevisiae defines a characteristic residence time for non-specific interactions of transcription factors with chromatin. Nucleic Acids Res 2016; 44:e160. [PMID: 27566148 PMCID: PMC5137432 DOI: 10.1093/nar/gkw744] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2016] [Revised: 08/05/2016] [Accepted: 08/15/2016] [Indexed: 12/26/2022] Open
Abstract
In vivo single molecule tracking has recently developed into a powerful technique for measuring and understanding the transient interactions of transcription factors (TF) with their chromatin response elements. However, this method still lacks a solid foundation for distinguishing between specific and non-specific interactions. To address this issue, we took advantage of the power of molecular genetics of yeast. Yeast TF Ace1p has only five specific sites in the genome and thus serves as a benchmark to distinguish specific from non-specific binding. Here, we show that the estimated residence time of the short-residence molecules is essentially the same for Hht1p, Ace1p and Hsf1p, equaling 0.12-0.32 s. These three DNA-binding proteins are very different in their structure, function and intracellular concentration. This suggests that (i) short-residence molecules are bound to DNA non-specifically, and (ii) that non-specific binding shares common characteristics between vastly different DNA-bound proteins and thus may have a common underlying mechanism. We develop new and robust procedure for evaluation of adverse effects of labeling, and new quantitative analysis procedures that significantly improve residence time measurements by accounting for fluorophore blinking. Our results provide a framework for the reliable performance and analysis of single molecule TF experiments in yeast.
Collapse
Affiliation(s)
- David A Ball
- CCR/LRBGE Optical Microscopy Core, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892, USA
| | - Gunjan D Mehta
- CCR/LRBGE Optical Microscopy Core, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892, USA
| | - Ronit Salomon-Kent
- CCR/LRBGE Optical Microscopy Core, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892, USA
| | - Davide Mazza
- Istituto Scientifico Ospedale San Raffaele, Centro di Imaging Sperimentale e Università Vita-Salute San Raffaele, Milan 20132, Italy
| | - Tatsuya Morisaki
- Department of Biochemistry and Molecular Biology, Colorado State University, Fort Collins, CO 80523, USA
| | - Florian Mueller
- Institut Pasteur, Computation Imaging and Modeling Unit, CNRS, URA 2582, Paris 75015, France
| | - James G McNally
- Institute for Soft Matter and Functional Materials, Helmholtz Center Berlin, Berlin 12489, Germany
| | - Tatiana S Karpova
- CCR/LRBGE Optical Microscopy Core, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892, USA
| |
Collapse
|
15
|
Yuan H, Debroye E, Caliandro G, Janssen KP, van Loon J, Kirschhock CEA, Martens JA, Hofkens J, Roeffaers MBJ. Photoluminescence Blinking of Single-Crystal Methylammonium Lead Iodide Perovskite Nanorods Induced by Surface Traps. ACS OMEGA 2016; 1:148-159. [PMID: 27617323 PMCID: PMC5013672 DOI: 10.1021/acsomega.6b00107] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/06/2016] [Accepted: 07/14/2016] [Indexed: 05/25/2023]
Abstract
Photoluminescence (PL) of organometal halide perovskite materials reflects the charge dynamics inside of the material and thus contains important information for understanding the electro-optical properties of the material. Interpretation of PL blinking of methylammonium lead iodide (MAPbI3) nanostructures observed on polycrystalline samples remains puzzling owing to their intrinsic disordered nature. Here, we report a novel method for the synthesis of high-quality single-crystal MAPbI3 nanorods and demonstrate a single-crystal study on MAPbI3 PL blinking. At low excitation power densities, two-state blinking was found on individual nanorods with dimensions of several hundred nanometers. A super-resolution localization study on the blinking of individual nanorods showed that single crystals of several hundred nanometers emit and blink as a whole, without showing changes in the localization center over the crystal. Moreover, both the blinking ON and OFF times showed power-law distributions, indicating trapping-detrapping processes. This is further supported by the PL decay times of the individual nanorods, which were found to correlate with the ON/OFF states. Furthermore, a strong environmental dependence of the nanorod PL blinking was revealed by comparing the measurements in vacuum, nitrogen, and air, implying that traps locate close to crystal surfaces. We explain our observations by proposing surface charge traps that are likely related to under-coordinated lead ions and methylammonium vacancies to result in the PL blinking observed here.
Collapse
Affiliation(s)
- Haifeng Yuan
- Department
of Chemistry, KU Leuven, Celestijnenlaan 200F, B-3001 Leuven, Belgium
| | - Elke Debroye
- Department
of Chemistry, KU Leuven, Celestijnenlaan 200F, B-3001 Leuven, Belgium
| | - Giorgio Caliandro
- Department
of Chemistry, KU Leuven, Celestijnenlaan 200F, B-3001 Leuven, Belgium
| | - Kris P.
F. Janssen
- Department
of Chemistry, KU Leuven, Celestijnenlaan 200F, B-3001 Leuven, Belgium
| | - Jordi van Loon
- Centre
for Surface Chemistry and Catalysis, KU
Leuven, Kasteelpark Arenberg
23, 3001 Heverlee, Belgium
| | | | - Johan A. Martens
- Centre
for Surface Chemistry and Catalysis, KU
Leuven, Kasteelpark Arenberg
23, 3001 Heverlee, Belgium
| | - Johan Hofkens
- Department
of Chemistry, KU Leuven, Celestijnenlaan 200F, B-3001 Leuven, Belgium
- RIES, Hokkaido
University,
N20W10, Kita-Ward, Sapporo 001-0020, Japan
| | - Maarten B. J. Roeffaers
- Centre
for Surface Chemistry and Catalysis, KU
Leuven, Kasteelpark Arenberg
23, 3001 Heverlee, Belgium
| |
Collapse
|
16
|
Govind Rao V, Dhital B, Lu HP. Probing Driving Force and Electron Accepting State Density Dependent Interfacial Electron Transfer Dynamics: Suppressed Fluorescence Blinking of Single Molecules on Indium Tin Oxide Semiconductor. J Phys Chem B 2015; 120:1685-97. [DOI: 10.1021/acs.jpcb.5b08807] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Vishal Govind Rao
- Department
of Chemistry and
Center for Photochemical Sciences, Bowling Green State University, Bowling
Green, Ohio 43403, United States
| | - Bharat Dhital
- Department
of Chemistry and
Center for Photochemical Sciences, Bowling Green State University, Bowling
Green, Ohio 43403, United States
| | - H. Peter Lu
- Department
of Chemistry and
Center for Photochemical Sciences, Bowling Green State University, Bowling
Green, Ohio 43403, United States
| |
Collapse
|
17
|
Würthner F, Saha-Möller CR, Fimmel B, Ogi S, Leowanawat P, Schmidt D. Perylene Bisimide Dye Assemblies as Archetype Functional Supramolecular Materials. Chem Rev 2015; 116:962-1052. [PMID: 26270260 DOI: 10.1021/acs.chemrev.5b00188] [Citation(s) in RCA: 961] [Impact Index Per Article: 106.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Frank Würthner
- Institut für Organische Chemie and Center for Nanosystems Chemistry, Universität Würzburg , Am Hubland, 97074 Würzburg, Germany
| | - Chantu R Saha-Möller
- Institut für Organische Chemie and Center for Nanosystems Chemistry, Universität Würzburg , Am Hubland, 97074 Würzburg, Germany
| | - Benjamin Fimmel
- Institut für Organische Chemie and Center for Nanosystems Chemistry, Universität Würzburg , Am Hubland, 97074 Würzburg, Germany
| | - Soichiro Ogi
- Institut für Organische Chemie and Center for Nanosystems Chemistry, Universität Würzburg , Am Hubland, 97074 Würzburg, Germany
| | - Pawaret Leowanawat
- Institut für Organische Chemie and Center for Nanosystems Chemistry, Universität Würzburg , Am Hubland, 97074 Würzburg, Germany
| | - David Schmidt
- Institut für Organische Chemie and Center for Nanosystems Chemistry, Universität Würzburg , Am Hubland, 97074 Würzburg, Germany
| |
Collapse
|
18
|
Wen X, Ho-Baillie A, Huang S, Sheng R, Chen S, Ko HC, Green MA. Mobile Charge-Induced Fluorescence Intermittency in Methylammonium Lead Bromide Perovskite. NANO LETTERS 2015; 15:4644-9. [PMID: 26086568 DOI: 10.1021/acs.nanolett.5b01405] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Organic-inorganic halide perovskite has emerged as a very promising material for solar cells due to its excellent photovoltaic enabling properties resulting in rapid increase in device efficiency over the last 3 years. Extensive knowledge and in-depth physical understanding in the excited state carrier dynamics are urgently required. Here we investigate the fluorescence intermittency (also known as blinking) in vapor-assisted fabricated CH3NH3PbBr3 perovskite. The evident fluorescence blinking is observed in a dense CH3NH3PbBr3 perovskite film that is composed of nanoparticles in close contact with each other. In the case of an isolated nanoparticle no fluorescence blinking is observed. The "ON" probability of fluorescence is dependent on the excitation intensity and exhibits a similar power rule to semiconductor quantum dots at higher excitation intensity. As the vapor-assisted fabricated CH3NH3PbBr3 perovskite film is a cluster of nanoparticles forming a dense film, it facilitates mobile charge migration between the nanoparticles and charge accumulation at the surface or at the boundary of the nanoparticles. This leads to enhanced Auger-like nonradiative recombination contributing to the fluorescence intermittency observed. This finding provides unique insight into the charge accumulation and migration and thus is of crucial importance for device design and improvement.
Collapse
Affiliation(s)
- Xiaoming Wen
- †Australian Centre for Advanced Photovoltaics (ACAP), School of Photovoltaic and Renewable Energy Engineering, University of New South Wales, Sydney 2052, Australia
| | - Anita Ho-Baillie
- †Australian Centre for Advanced Photovoltaics (ACAP), School of Photovoltaic and Renewable Energy Engineering, University of New South Wales, Sydney 2052, Australia
| | - Shujuan Huang
- †Australian Centre for Advanced Photovoltaics (ACAP), School of Photovoltaic and Renewable Energy Engineering, University of New South Wales, Sydney 2052, Australia
| | - Rui Sheng
- †Australian Centre for Advanced Photovoltaics (ACAP), School of Photovoltaic and Renewable Energy Engineering, University of New South Wales, Sydney 2052, Australia
| | - Sheng Chen
- †Australian Centre for Advanced Photovoltaics (ACAP), School of Photovoltaic and Renewable Energy Engineering, University of New South Wales, Sydney 2052, Australia
| | - Hsien-chen Ko
- ‡Institute of Physics, Academia Sinica, Nankang, Taipei, 105, Taiwan
| | - Martin A Green
- †Australian Centre for Advanced Photovoltaics (ACAP), School of Photovoltaic and Renewable Energy Engineering, University of New South Wales, Sydney 2052, Australia
| |
Collapse
|
19
|
Si J, Volkán-Kacsó S, Eltom A, Morozov Y, McDonald MP, Kuno M, Jankó B. Heterogeneous Fluorescence Intermittency in Single Layer Reduced Graphene Oxide. NANO LETTERS 2015; 15:4317-4321. [PMID: 26057349 DOI: 10.1021/acs.nanolett.5b00191] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
We provide, for the first time, direct experimental evidence for heterogeneous blinking in reduced graphene oxide (rGO) during photolysis. The spatially resolved intermittency originates from regions within individual rGO sheets and shows 1/f-like power spectral density. We describe the evolution of rGO blinking using the multiple recombination center (MRC) model that captures common features of nanoscale blinking. Our results illustrate the universal nature of blinking and suggest a common microscopic origin for the effect.
Collapse
Affiliation(s)
- Jixin Si
- †Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556, United States
| | - Sándor Volkán-Kacsó
- §Noyes Laboratory of Chemical Physics, California Institute of Technology, 1200 East California Boulevard, Pasadena, California 91125, United States
| | - Ahmed Eltom
- ‡Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, Indiana 46556, United States
| | - Yurii Morozov
- ‡Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, Indiana 46556, United States
| | - Matthew P McDonald
- ‡Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, Indiana 46556, United States
| | - Masaru Kuno
- ‡Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, Indiana 46556, United States
| | - Boldizsár Jankó
- †Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556, United States
| |
Collapse
|
20
|
Volkán-Kacsó S. Two-state theory of binned photon statistics for a large class of waiting time distributions and its application to quantum dot blinking. J Chem Phys 2015; 140:224110. [PMID: 24929377 DOI: 10.1063/1.4881460] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023] Open
Abstract
A theoretical method is proposed for the calculation of the photon counting probability distribution during a bin time. Two-state fluorescence and steady excitation are assumed. A key feature is a kinetic scheme that allows for an extensive class of stochastic waiting time distribution functions, including power laws, expanded as a sum of weighted decaying exponentials. The solution is analytic in certain conditions, and an exact and simple expression is found for the integral contribution of "bright" and "dark" states. As an application for power law kinetics, theoretical results are compared with experimental intensity histograms from a number of blinking CdSe/ZnS quantum dots. The histograms are consistent with distributions of intensity states around a "bright" and a "dark" maximum. A gap of states is also revealed in the more-or-less flat inter-peak region. The slope and to some extent the flatness of the inter-peak feature are found to be sensitive to the power-law exponents. Possible models consistent with these findings are discussed, such as the combination of multiple charging and fluctuating non-radiative channels or the multiple recombination center model. A fitting of the latter to experiment provides constraints on the interaction parameter between the recombination centers. Further extensions and applications of the photon counting theory are also discussed.
Collapse
Affiliation(s)
- Sándor Volkán-Kacsó
- Noyes Laboratory of Chemical Physics, California Institute of Technology, 1200 East California Boulevard, Pasadena, California 91125, USA
| |
Collapse
|
21
|
Abstract
Luminescence blinking is an inherent feature of optical emission from individual fluorescent molecules and quantum dots. There have been intense efforts, although not with complete resolution, toward the understanding of the mechanistic origin of blinking and also its mitigation in quantum dots. As an advance in our microscopic view of blinking, we show that the luminescence blinking of a quantum dot becomes unusually heavy in the temporal vicinity of a reactive transformation. This stage of heavy blinking is a result of defects/dopants formed within the quantum dot on its path to conversion. The evolution of blinking behavior along the reaction path allows us to measure the lifetime of the critical dopant-related intermediate in the reaction. This work establishes luminescence blinking as a single-nanocrystal level probe of catalytic, photocatalytic, and electrochemical events occurring in the solid-state or on semiconductor surfaces.
Collapse
Affiliation(s)
- Aaron L Routzahn
- †Department of Chemistry, ‡Department of Physics, and §Materials Research Lab, University of Illinois, Urbana-Champaign, Illinois 61801, United States
| | - Prashant K Jain
- †Department of Chemistry, ‡Department of Physics, and §Materials Research Lab, University of Illinois, Urbana-Champaign, Illinois 61801, United States
| |
Collapse
|
22
|
Collini E, Bolzonello L, Zerbetto M, Ferrante C, Manfredi N, Abbotto A. Lifetime shortening and fast energy-tansfer processes upon dimerization of a A-π-D-π-A molecule. Chemphyschem 2014; 15:310-9. [PMID: 24265124 DOI: 10.1002/cphc.201300694] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2013] [Revised: 10/21/2013] [Indexed: 11/10/2022]
Abstract
Time-resolved fluorescence and transient absorption experiments uncover a distinct change in the relaxation dynamics of the homo-dimer formed by two 2,5-bis[1-(4-N-methylpyridinium)ethen-2-yl)]-N-methylpyrrole ditriflate (M) units linked by a short alkyl chain when compared to that of the monomer M. Fluorescence decay traces reveal characteristic decay times of 1.1 ns and 210 ps for M and the dimer, respectively. Transient absorption spectra in the spectral range of 425-1050 nm display similar spectral features for both systems, but strongly differ in the characteristic relaxation times gathered from a global fit of the experimental data. To rationalize the data we propose that after excitation of the dimer the energy localizes on one M branch and then decays to a dark state, peculiar only of the dimer. This dark state relaxes to the ground state within 210 ps through non-radiative relaxation. The nature of the dark state is discussed in relation to different possible photophysical processes such as excimer formation and charge transfer between the two M units. Anisotropy decay traces of the probe-beam differential transmittance of M and the dimer fall on complete different time scales as well. The anisotropy decay for M is satisfactorily ascribed to rotational diffusion in DMSO, whereas for the dimer it occurs on a faster time scale and is likely caused by energy-transfer processes between the two monomer M units.
Collapse
Affiliation(s)
- Elisabetta Collini
- Dipartimento di Scienze Chimiche and UdR INSTM, Università di Padova, Via Marzolo 1, 35131 Padova (Italy)
| | | | | | | | | | | |
Collapse
|
23
|
Kozankiewicz B, Orrit M. Single-molecule photophysics, from cryogenic to ambient conditions. Chem Soc Rev 2014; 43:1029-43. [DOI: 10.1039/c3cs60165j] [Citation(s) in RCA: 59] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
24
|
Hollingsworth JA. Heterostructuring Nanocrystal Quantum Dots Toward Intentional Suppression of Blinking and Auger Recombination. CHEMISTRY OF MATERIALS : A PUBLICATION OF THE AMERICAN CHEMICAL SOCIETY 2013; 25:1318-1331. [PMID: 24062602 PMCID: PMC3778929 DOI: 10.1021/cm304161d] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
At the level of a single particle, nanocrystal quantum dots (NQDs) are observed to fluoresce intermittently or "blink." They are also characterized by an efficient non-radiative recombination process known as Auger Recombination (AR). Recently, new approaches to NQD heterostructuring have been developed that directly impact both blinking and AR, resulting in dramatic suppression of these unwanted processes. The three successful hetero-NQD motifs are reviewed here: (1) interfacial alloying, (2) thick or "giant" shells, and (3) specific type-II electronic structures. These approaches, which rely on modifying or tuning internal NQD core/shell structures, are compared with alternative strategies for blinking suppression that rely, instead, on surface modifications or surface-mediated interactions. Finally, in each case, the unique synthetic approaches or challenges addressed that have driven the realization of novel and important functionality are discussed, along with the implications for development of a comprehensive 'materials design' strategy for blinking and AR-suppressed heterostructured NQDs.
Collapse
Affiliation(s)
- Jennifer A Hollingsworth
- Material Physics & Applications Division: Center for Integrated Nanotechnologies, Los Alamos National Laboratory, Los Alamos, NM 8754
| |
Collapse
|
25
|
Kaufman LJ. Heterogeneity in Single-Molecule Observables in the Study of Supercooled Liquids. Annu Rev Phys Chem 2013; 64:177-200. [DOI: 10.1146/annurev-physchem-040412-110033] [Citation(s) in RCA: 50] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Bulk approaches to studying heterogeneous systems obscure important details, as they report average behavior rather than the distribution of behaviors in such environments. Small-molecule and polymeric supercooled liquids, which display heterogeneity in their dynamics without an underlying structural heterogeneity that sets those dynamics, are important constituents of this category of condensed matter systems. A variety of approaches have been devised to unravel ensemble averaging in supercooled liquids. This review focuses on the ultimate subensemble approach, single-molecule measurements, as they have been applied to the study of supercooled liquids. We detail how three key experimental observables (single-molecule probe rotation, translation, and fluorescence lifetime) have been employed to provide detail on dynamic heterogeneity in supercooled liquids. Special attention is given to the potential for, but also the challenges in, discriminating spatial and temporal heterogeneity and detailing the length scales and timescales of heterogeneity in these systems.
Collapse
Affiliation(s)
- Laura J. Kaufman
- Department of Chemistry, Columbia University, New York, NY 10027
| |
Collapse
|
26
|
Frantsuzov PA, Volkán-Kacsó S, Jankó B. Universality of the fluorescence intermittency in nanoscale systems: experiment and theory. NANO LETTERS 2013; 13:402-408. [PMID: 23272638 DOI: 10.1021/nl3035674] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
A variety of optically active nanoscale objects show extremely long correlations in the fluctuations of fluorescence intensity (blinking). Here we performed a systematic study to quantitatively estimate the power spectral density (PSD) of the fluorescence trajectories of colloidal and self-assembled quantum dots (QDs), nanorods (NRs), nanowires (NWs), and organic molecules. We report for the first time a statistically correct method of PSD estimation suitable for these systems. Our method includes a detailed analysis of the confidence intervals. The striking similarity in the spectra of these nanoscale systems, including even a "nonblinking" quantum dot investigated by Wang and collaborators (Nature2009, 459, 685-689), is powerful evidence for the existence of a universal physical mechanism underlying the blinking phenomenon in all of these fluorophores (Frantsuzov et al. Nat. Phys.2008, 4, 519-522). In this paper we show that the features of this universal mechanism can be captured phenomenologically by the multiple recombination center model (MRC) we suggested recently for explaining single colloidal QD intermittency. Within the framework of the MRCs we qualitatively explain all of the important features of fluorescence intensity fluctuations for a broad spectrum of nanoscale emitters.
Collapse
Affiliation(s)
- Pavel A Frantsuzov
- Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556, USA
| | | | | |
Collapse
|
27
|
Stopel MHW, Prangsma JC, Blum C, Subramaniam V. Blinking statistics of colloidal quantum dots at different excitation wavelengths. RSC Adv 2013. [DOI: 10.1039/c3ra43637c] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
|
28
|
Qi G, Jiang L, Zhao Y, Yang Y, Li X. Efficient collection of excitation energy from a linear-shaped weakly interacted perylenetetracarboxylic diimides array. Phys Chem Chem Phys 2013; 15:17342-53. [DOI: 10.1039/c3cp52941j] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
|
29
|
|
30
|
Orlov SV, Naumov AV, Vainer YG, Kador L. Spectrally resolved analysis of fluorescence blinking of single dye molecules in polymers at low temperatures. J Chem Phys 2012. [DOI: 10.1063/1.4766321] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
31
|
Dennis AM, Mangum BD, Piryatinski A, Park YS, Hannah DC, Casson JL, Williams DJ, Schaller RD, Htoon H, Hollingsworth JA. Suppressed blinking and auger recombination in near-infrared type-II InP/CdS nanocrystal quantum dots. NANO LETTERS 2012; 12:5545-51. [PMID: 23030497 PMCID: PMC3498532 DOI: 10.1021/nl302453x] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Abstract
Nonblinking excitonic emission from near-infrared and type-II nanocrystal quantum dots (NQDs) is reported for the first time. To realize this unusual degree of stability at the single-dot level, novel InP/CdS core/shell NQDs were synthesized for a range of shell thicknesses (~1-11 monolayers of CdS). Ensemble spectroscopy measurements (photoluminescence peak position and radiative lifetimes) and electronic structure calculations established the transition from type-I to type-II band alignment in these heterostructured NQDs. More significantly, single-NQD studies revealed clear evidence for blinking suppression that was not strongly shell-thickness dependent, while photobleaching and biexciton lifetimes trended explicitly with extent of shelling. Specifically, very long biexciton lifetimes-up to >7 ns-were obtained for the thickest-shell structures, indicating dramatic suppression of nonradiative Auger recombination. This new system demonstrates that electronic structure and shell thickness can be employed together to effect control over key single-dot and ensemble NQD photophysical properties.
Collapse
Affiliation(s)
- Allison M. Dennis
- Materials Physics & Applications Division: Center for Integrated Nanotechnologies, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
| | - Benjamin D. Mangum
- Materials Physics & Applications Division: Center for Integrated Nanotechnologies, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
| | - Andrei Piryatinski
- Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
| | - Young-Shin Park
- Materials Physics & Applications Division: Center for Integrated Nanotechnologies, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
| | - Daniel C. Hannah
- Department of Chemistry, Northwestern University, Evanston, Illinois 60208, USA
| | - Joanna L. Casson
- Chemistry Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
| | - Darrick J. Williams
- Materials Physics & Applications Division: Center for Integrated Nanotechnologies, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
| | - Richard D. Schaller
- Department of Chemistry, Northwestern University, Evanston, Illinois 60208, USA
- Center for Nanoscale Materials, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - Han Htoon
- Materials Physics & Applications Division: Center for Integrated Nanotechnologies, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
| | - Jennifer A. Hollingsworth
- Materials Physics & Applications Division: Center for Integrated Nanotechnologies, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
- CORRESPONDING AUTHOR: (J.A.H.)
| |
Collapse
|
32
|
Abstract
Recent experimental and theoretical studies of photoluminescence intermittency (PI) or “blinking” exhibited by single core/shell quantum dots and single organic luminophores are reviewed. For quantum dots, a discussion of early models describing the origin of PI in these materials and recent challenges to these models are presented. For organic luminophores the role of electron transfer, proton transfer and other photophysical processes in PI are discussed. Finally, new experimental and data analysis methods are outlined that promise to be instrumental in future discoveries regarding the origin(s) of PI exhibited by single emitters.
Collapse
|
33
|
Lesoine JF, Venkataraman PA, Maloney PC, Dumont M, Novotny L. Nanochannel-based single molecule recycling. NANO LETTERS 2012; 12:3273-8. [PMID: 22662745 PMCID: PMC3377747 DOI: 10.1021/nl301341m] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
We present a method for measuring the fluorescence from a single molecule hundreds of times without surface immobilization. The approach is based on the use of electroosmosis to repeatedly drive a single target molecule in a fused silica nanochannel through a stationary laser focus. Single molecule fluorescence detected during the transit time through the laser focus is used to repeatedly reverse the electrical potential controlling the flow direction. Our method does not rely on continuous observation and therefore is less susceptible to fluorescence blinking than existing fluorescence-based trapping schemes. The variation in the turnaround times can be used to measure the diffusion coefficient on a single molecule level. We demonstrate the ability to recycle both proteins and DNA in nanochannels and show that the procedure can be combined with single-pair Förster energy transfer. Nanochannel-based single molecule recycling holds promise for studying conformational dynamics on the same single molecule in solution and without surface tethering.
Collapse
Affiliation(s)
- John F. Lesoine
- Institute of Optics, University of Rochester, Rochester NY 14627
| | - Prahnesh A. Venkataraman
- Department of Biochemistry and Biophysics, University of Rochester Medical Center, Rochester, NY 14627
| | - Peter C. Maloney
- Department of Physiology, Johns Hopkins Medical School, Baltimore, MD, USA
| | - Mark Dumont
- Department of Biochemistry and Biophysics, University of Rochester Medical Center, Rochester, NY 14627
| | - Lukas Novotny
- Institute of Optics, University of Rochester, Rochester NY 14627
| |
Collapse
|
34
|
Bahng HW, Yoon MC, Lee JE, Murase Y, Yoneda T, Shinokubo H, Osuka A, Kim D. Ensemble and Single-Molecule Spectroscopic Study on Excitation Energy Transfer Processes in 1,3-Phenylene-Linked Perylenebisimide Oligomers. J Phys Chem B 2012; 116:1244-55. [DOI: 10.1021/jp208855u] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Affiliation(s)
- Hee Won Bahng
- Spectroscopy Laboratory for Functional π-Electronic Systems and Department of Chemistry, Yonsei University, Seoul 120-749, Korea
| | - Min-Chul Yoon
- Spectroscopy Laboratory for Functional π-Electronic Systems and Department of Chemistry, Yonsei University, Seoul 120-749, Korea
| | - Ji-Eun Lee
- Spectroscopy Laboratory for Functional π-Electronic Systems and Department of Chemistry, Yonsei University, Seoul 120-749, Korea
| | - Yuichi Murase
- Department of Chemistry and Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan
| | - Tomoki Yoneda
- Department of Chemistry and Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan
| | - Hiroshi Shinokubo
- Department of Applied Chemistry, Graduate School of Engineering, Nagoya University, Chikusa-ku, Nagoya 464-8603, Japan
| | - Atsuhiro Osuka
- Department of Chemistry and Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan
| | - Dongho Kim
- Spectroscopy Laboratory for Functional π-Electronic Systems and Department of Chemistry, Yonsei University, Seoul 120-749, Korea
| |
Collapse
|
35
|
Fückel B, Hinze G, Wu J, Müllen K, Basché T. Probing the Electronic State of a Single Coronene Molecule by the Emission from Proximate Fluorophores. Chemphyschem 2012; 13:938-45. [DOI: 10.1002/cphc.201100785] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2011] [Revised: 12/05/2011] [Indexed: 11/10/2022]
|
36
|
Yasuda M, Iida A, Ito S, Miyasaka H. Fluorescence detection of single guest molecules in ultrasmall droplets of nonpolar solvent. Phys Chem Chem Phys 2012; 14:345-52. [PMID: 22085976 DOI: 10.1039/c1cp22207d] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We have investigated emissive behaviours of individual perylenebisimide derivatives, N,N'-dipropyl-1,6,7,12-tetrakis(4-tert-butylphenoxy)-3,4,9,10-perylenetetra-carboxydiimide (BP-PDI), in single ultrasmall droplets of n-octane at room temperature by using confocal and wide-field microscopic techniques. Single BP-PDIs in the small droplets show no distinguishable blinking in the time courses of fluorescence intensity. This is attributed to small probabilities of the formation of the long-lived ionized state leading to the off-state of the fluorescence. Temporal change in the degree of polarization of fluorescence and wide-field fluorescence images indicated short-time adsorption of the fluorescent molecules at the interfaces between n-octane and watery environments. Fluorescence correlation spectroscopy revealed that the adsorption/desorption processes took place at least in two different time scales, probably due to the difference in the adsorption geometry and/or in the interaction, such as van der Waals interaction and hydrogen bonding, between the dye and the interface.
Collapse
Affiliation(s)
- Masakazu Yasuda
- Division of Frontier Materials Science, Graduate School of Engineering Science and Center for Quantum Materials Science under Extreme Conditions, Osaka University, Toyonaka, Osaka 560-8531, Japan
| | | | | | | |
Collapse
|
37
|
Schlosser F, Sung J, Kim P, Kim D, Würthner F. Excitation energy migration in covalently linked perylene bisimide macrocycles. Chem Sci 2012. [DOI: 10.1039/c2sc20589k] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
|
38
|
Mitsui M, Kawano Y, Takahashi R, Fukui H. Photophysics and photostability of 9,10-bis(phenylethynyl)anthracene revealed by single-molecule spectroscopy. RSC Adv 2012. [DOI: 10.1039/c2ra21100a] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
|
39
|
Two types of luminescence blinking revealed by spectroelectrochemistry of single quantum dots. Nature 2011; 479:203-7. [PMID: 22071764 DOI: 10.1038/nature10569] [Citation(s) in RCA: 398] [Impact Index Per Article: 30.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2011] [Accepted: 09/19/2011] [Indexed: 01/06/2023]
Abstract
Photoluminescence blinking--random switching between states of high (ON) and low (OFF) emissivities--is a universal property of molecular emitters found in dyes, polymers, biological molecules and artificial nanostructures such as nanocrystal quantum dots, carbon nanotubes and nanowires. For the past 15 years, colloidal nanocrystals have been used as a model system to study this phenomenon. The occurrence of OFF periods in nanocrystal emission has been commonly attributed to the presence of an additional charge, which leads to photoluminescence quenching by non-radiative recombination (the Auger mechanism). However, this 'charging' model was recently challenged in several reports. Here we report time-resolved photoluminescence studies of individual nanocrystal quantum dots performed while electrochemically controlling the degree of their charging, with the goal of clarifying the role of charging in blinking. We find that two distinct types of blinking are possible: conventional (A-type) blinking due to charging and discharging of the nanocrystal core, in which lower photoluminescence intensities correlate with shorter photoluminescence lifetimes; and a second sort (B-type), in which large changes in the emission intensity are not accompanied by significant changes in emission dynamics. We attribute B-type blinking to charge fluctuations in the electron-accepting surface sites. When unoccupied, these sites intercept 'hot' electrons before they relax into emitting core states. Both blinking mechanisms can be electrochemically controlled and completely suppressed by application of an appropriate potential.
Collapse
|
40
|
Ai N, Walden-Newman W, Song Q, Kalliakos S, Strauf S. Suppression of blinking and enhanced exciton emission from individual carbon nanotubes. ACS NANO 2011; 5:2664-70. [PMID: 21375256 DOI: 10.1021/nn102885p] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
Blinking and spectral diffusion are hallmarks of nanoscale light emitters and a challenge for creating stable fluorescent biomarkers or efficient nonclassical light sources. Here, we demonstrate suppression of blinking and spectral diffusion of individual single-wall carbon nanotubes by manipulation of their dielectric environment, resulting in 5-fold enhanced light emission. In addition, it was found that the characteristic slopes of the blinking power laws are largely independent of the dielectric environment in the limit of a large number of switching events. In contrast, the on/off ratio determined from statistical occurrence analysis is found to be improved by 3 orders of magnitude toward the on state, making the on/off ratio an important measure for charge transfer from/into the local dielectric environment of a quantum emitter. Furthermore, our approach is compatible with integration into cavities, in contrast to previous demonstrations of spectral diffusion suppression achieved in free-standing single-wall carbon nanotubes. This opens up possibilities to couple the exciton emission of nonblinking carbon nanotubes to cavity modes to further benefit by the Purcell effect and to enhance the light extraction efficiency, in order to ultimately demonstrate efficient photonic devices.
Collapse
Affiliation(s)
- Nan Ai
- Department of Physics & Engineering Physics, Stevens Institute of Technology, Castle Point on the Hudson, Hoboken, New Jersey 07030, USA
| | | | | | | | | |
Collapse
|
41
|
Krüger TPJ, Ilioaia C, van Grondelle R. Fluorescence Intermittency from the Main Plant Light-Harvesting Complex: Resolving Shifts between Intensity Levels. J Phys Chem B 2011; 115:5071-82. [DOI: 10.1021/jp201609c] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Tjaart P. J. Krüger
- Department of Physics and Astronomy, Faculty of Sciences, VU University Amsterdam, De Boelelaan 1081, 1081 HV Amsterdam, The Netherlands
| | - Cristian Ilioaia
- Department of Physics and Astronomy, Faculty of Sciences, VU University Amsterdam, De Boelelaan 1081, 1081 HV Amsterdam, The Netherlands
| | - Rienk van Grondelle
- Department of Physics and Astronomy, Faculty of Sciences, VU University Amsterdam, De Boelelaan 1081, 1081 HV Amsterdam, The Netherlands
| |
Collapse
|
42
|
Krüger TPJ, Ilioaia C, Valkunas L, van Grondelle R. Fluorescence Intermittency from the Main Plant Light-Harvesting Complex: Sensitivity to the Local Environment. J Phys Chem B 2011; 115:5083-95. [DOI: 10.1021/jp109833x] [Citation(s) in RCA: 61] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Affiliation(s)
- Tjaart P. J. Krüger
- Department of Physics and Astronomy, Faculty of Sciences, VU University Amsterdam, De Boelelaan 1081, 1081 HV Amsterdam, The Netherlands
| | - Cristian Ilioaia
- Department of Physics and Astronomy, Faculty of Sciences, VU University Amsterdam, De Boelelaan 1081, 1081 HV Amsterdam, The Netherlands
| | - Leonas Valkunas
- Institute of Physics, Center for Physical Sciences and Technology, Savanoriu 231, LT-02300 Vilnius, Lithuania and Department of Theoretical Physics, Faculty of Physics, Vilnius University, Sauletekio 9, LT-10222 Vilnius, Lithuania
| | - Rienk van Grondelle
- Department of Physics and Astronomy, Faculty of Sciences, VU University Amsterdam, De Boelelaan 1081, 1081 HV Amsterdam, The Netherlands
| |
Collapse
|
43
|
Suzuki K, Habuchi S, Vacha M. Blinking of single dye molecules in a polymer matrix is correlated with free volume in polymers. Chem Phys Lett 2011. [DOI: 10.1016/j.cplett.2011.02.041] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
44
|
Haase M, Hübner CG, Nolde F, Müllen K, Basché T. Photoblinking and photobleaching of rylene diimide dyes. Phys Chem Chem Phys 2011; 13:1776-85. [DOI: 10.1039/c0cp01814g] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
45
|
Weil T, Vosch T, Hofkens J, Peneva K, Müllen K. Rylenfarbstoffe als maßgeschneiderte Nanoemitter für die Photonik. Angew Chem Int Ed Engl 2010. [DOI: 10.1002/ange.200902532] [Citation(s) in RCA: 130] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
|
46
|
Weil T, Vosch T, Hofkens J, Peneva K, Müllen K. The Rylene Colorant Family-Tailored Nanoemitters for Photonics Research and Applications. Angew Chem Int Ed Engl 2010; 49:9068-93. [DOI: 10.1002/anie.200902532] [Citation(s) in RCA: 520] [Impact Index Per Article: 37.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
|
47
|
Volkán-Kacsó S, Frantsuzov PA, Jankó B. Correlations between subsequent blinking events in single quantum dots. NANO LETTERS 2010; 10:2761-2765. [PMID: 20698587 DOI: 10.1021/nl100253r] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
We explain the long-range correlations found by Stefani and his co-workers between blinking times of single colloidal quantum dot emission. Our explanation is based on the multiple recombination center model we recently suggested. The model produces positive correlations between subsequent on--on and off--off times and negative on--off correlations, as observed in the experiment. We also reproduce qualitatively the dependence of correlations between subsequent on--on, on-off, and off--off times on the number of switching events separating them.
Collapse
|
48
|
Thomsson D, Lin H, Scheblykin IG. Correlation analysis of fluorescence intensity and fluorescence anisotropy fluctuations in single-molecule spectroscopy of conjugated polymers. Chemphyschem 2010; 11:897-904. [PMID: 20087921 DOI: 10.1002/cphc.200900724] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Single-molecule spectroscopy techniques are used to investigate time fluctuations of the fluorescence properties of two different types of conjugated polymer, a polythiophene derivative (PDOPT) and a phenylene vinylene derivative (MEH-PPV), at 100 and 293 K. Linear correlation coefficients between fluorescence intensity and polarization are used to characterize fluctuations. We are able to distinguish between different blinking and bleaching effects on the polarization. Furthermore, the polarization data reveal clear differences in the topology of these two polymers, which is related to the ordered conformation of the MEH-PPV. Plots of correlation coefficients appear to be very different for the two polymers and are also very sensitive to temperature. These observations prove that correlation analysis is a useful tool to understand fluorescence fluctuations in multi-chromophoric systems.
Collapse
Affiliation(s)
- Daniel Thomsson
- Department of Chemical Physics, Lund University, P.O. Box 124, 22100 Lund, Sweden
| | | | | |
Collapse
|
49
|
Marcus RA. Interaction of theory and experiment: examples from single molecule studies of nanoparticles. PHILOSOPHICAL TRANSACTIONS. SERIES A, MATHEMATICAL, PHYSICAL, AND ENGINEERING SCIENCES 2010; 368:1109-24. [PMID: 20123749 PMCID: PMC3263810 DOI: 10.1098/rsta.2009.0261] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Abstract
This article is in part the author's perspective on the revolution that has occurred in theoretical chemistry during the past half-century. In this period much of theoretical chemistry has moved from its initial emphasis on analytic treatments, resulting in equations for physical chemical and chemical phenomena, to the detailed computation of many different systems and processes. In the best sense the old and the new are complementary and their coexistence can benefit both. Experiment too has seen major developments. One of the newer types of experiment is that of single molecule studies. They range from those on small inorganic and organic nanoparticles to large biological species. We illustrate some of the issues that arise, using the topic of 'quantum dots' (QDs), and choosing a particular inorganic nanoparticle, CdSe, the most studied of these systems. Its study reflects the problems that arise in experiment and in theories in this field. The complementary nature of the conventional ensemble experiments and the new single molecule experiments is described and is illustrated by trajectories for the two types of experiments. The research in the QD field is both experimentally and theoretically a currently ongoing process, for which the answers are not fully known in spite of the large body of research. The detailed role of surface states is part of the problem. The field continues to yield new and unexpected results. In a sense this part of the article is an interim report that illustrates one analytic approach to the topic and where computer calculations and simulations can be expected to provide added insight.
Collapse
Affiliation(s)
- Rudolph A Marcus
- Noyes Laboratory of Chemical Physics, California Institute of Technology, Pasadena, CA 91125, USA.
| |
Collapse
|
50
|
Kowerko D, Schuster J, Amecke N, Abdel-Mottaleb M, Dobrawa R, Würthner F, von Borczyskowski C. FRET and ligand related NON-FRET processes in single quantum dot-perylene bisimide assemblies. Phys Chem Chem Phys 2010; 12:4112-23. [PMID: 20379502 DOI: 10.1039/b910308b] [Citation(s) in RCA: 58] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Nanoassemblies are formed via self-assembly of ZnS capped CdSe quantum dots (QD) and perylene bisimide dyes (PBI). Upon assembly formation with functionalized dye molecules the QD photoluminescence (PL) is quenched. Quenching has been assigned partly to FRET (fluorescence resonance energy transfer) and NON-FRET processes. By means of time resolved single particle spectroscopy of immobilized QD-dye assemblies, it is demonstrated that NON-FRET processes are due to new non-radiative decay channels caused by the assembly formation process itself. Immobilized (single) assemblies exhibit the same processes as ensembles of assemblies in toluene solution. Only one dye molecule on a QD quenches the PL up to 50%, which is much stronger than is expected when replacing a volume related number of ligands. NON-FRET processes are distinct from photoinduced charge and/or energy transfer. A combination of a Stern-Volmer and FRET analysis of ensemble experiments supports the investigation of the dynamics of assembly formation at extremely low concentration ratios of PBI to QD. This allows us to distinguish between the effects of PBI and ligands on PL quenching on a single molecule level which is not possible in conventional ligand dynamic experiments.
Collapse
Affiliation(s)
- Danny Kowerko
- Institute of Physics and NanoMA (Center for Nanostructured Materials and Analytics), Chemnitz University of Technology, 09107 Chemnitz, Germany.
| | | | | | | | | | | | | |
Collapse
|