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Baranov D, Fieramosca A, Yang RX, Polimeno L, Lerario G, Toso S, Giansante C, Giorgi MD, Tan LZ, Sanvitto D, Manna L. Aging of Self-Assembled Lead Halide Perovskite Nanocrystal Superlattices: Effects on Photoluminescence and Energy Transfer. ACS NANO 2021; 15:650-664. [PMID: 33350811 DOI: 10.1021/acsnano.0c06595] [Citation(s) in RCA: 30] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
Excitonic coupling, electronic coupling, and cooperative interactions in self-assembled lead halide perovskite nanocrystals were reported to give rise to a red-shifted collective emission peak with accelerated dynamics. Here we report that similar spectroscopic features could appear as a result of the nanocrystal reactivity within the self-assembled superlattices. This is demonstrated by studying CsPbBr3 nanocrystal superlattices over time with room-temperature and cryogenic micro-photoluminescence spectroscopy, X-ray diffraction, and electron microscopy. It is shown that a gradual contraction of the superlattices and subsequent coalescence of the nanocrystals occurs over several days of keeping such structures under vacuum. As a result, a narrow, low-energy emission peak is observed at 4 K with a concomitant shortening of the photoluminescence lifetime due to the energy transfer between nanocrystals. When exposed to air, self-assembled CsPbBr3 nanocrystals develop bulk-like CsPbBr3 particles on top of the superlattices. At 4 K, these particles produce a distribution of narrow, low-energy emission peaks with short lifetimes and excitation fluence-dependent, oscillatory decays. Overall, the aging of CsPbBr3 nanocrystal assemblies dramatically alters their emission properties and that should not be overlooked when studying collective optoelectronic phenomena nor confused with superfluorescence effects.
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Affiliation(s)
- Dmitry Baranov
- Nanochemistry Department, Italian Institute of Technology, Via Morego 30, Genova 16163, Italy
| | - Antonio Fieramosca
- CNR Nanotec, Institute of Nanotechnology, Via Monteroni, Lecce 73100, Italy
| | - Ruo Xi Yang
- Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Laura Polimeno
- CNR Nanotec, Institute of Nanotechnology, Via Monteroni, Lecce 73100, Italy
- Dipartimento di Matematica e Fisica "E. de Giorgi", Università Del Salento, Campus Ecotekne, Via Monteroni, Lecce 73100, Italy
| | - Giovanni Lerario
- CNR Nanotec, Institute of Nanotechnology, Via Monteroni, Lecce 73100, Italy
| | - Stefano Toso
- Nanochemistry Department, Italian Institute of Technology, Via Morego 30, Genova 16163, Italy
- International Doctoral Program in Science, Università Cattolica del Sacro Cuore, Brescia 25121, Italy
| | - Carlo Giansante
- CNR Nanotec, Institute of Nanotechnology, Via Monteroni, Lecce 73100, Italy
| | - Milena De Giorgi
- CNR Nanotec, Institute of Nanotechnology, Via Monteroni, Lecce 73100, Italy
| | - Liang Z Tan
- Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Daniele Sanvitto
- CNR Nanotec, Institute of Nanotechnology, Via Monteroni, Lecce 73100, Italy
| | - Liberato Manna
- Nanochemistry Department, Italian Institute of Technology, Via Morego 30, Genova 16163, Italy
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2
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Nikolenko LM, Gadomskaya AV, Spirin MG, Tovstun SA, Brichkin SB, Razumov VF. Förster Resonance Energy Transfer in Aggregates of CdSe Colloidal Quantum Dots with Adsorbed meso-Tetra(3-pyridyl)porphyrin. HIGH ENERGY CHEMISTRY 2020. [DOI: 10.1134/s0018143920050124] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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3
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Hottechamps J, Noblet T, Brans A, Humbert C, Dreesen L. How Quantum Dots Aggregation Enhances Förster Resonant Energy Transfer. Chemphyschem 2020; 21:853-862. [DOI: 10.1002/cphc.202000067] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2020] [Indexed: 11/08/2022]
Affiliation(s)
- Julie Hottechamps
- GRASP-BiophotonicsCESAMUniversity of LiegeInstitute of Physics Allée du 6 août 17 4000 Liège Belgium
| | - Thomas Noblet
- GRASP-BiophotonicsCESAMUniversity of LiegeInstitute of Physics Allée du 6 août 17 4000 Liège Belgium
| | - Alain Brans
- Center for Protein Engineering (CIP)InBioSUniversity of Liege, Quartier Agora Allée du six Août 13, B6a 4000 Liège Belgium
| | - Christophe Humbert
- Université Paris-SaclayCNRSInstitut de Chimie Physique UMR 8000 91405 Orsay France
| | - Laurent Dreesen
- GRASP-BiophotonicsCESAMUniversity of LiegeInstitute of Physics Allée du 6 août 17 4000 Liège Belgium
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4
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Banerjee D, Kar AK. Influence of polaron doping and concentration dependent FRET on luminescence of PAni-PMMA blends for application in PLEDs. Phys Chem Chem Phys 2018; 20:23055-23071. [PMID: 30167624 DOI: 10.1039/c8cp02968g] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The role of quantum mechanical phenomena such as polaron-exciton quenching interaction and concentration-dependent FRET in determining the luminescence efficiency of PAni-PMMA polymer blends has been investigated. PAni samples prepared in different environments using different acids and bases show different absorbance and emission profiles indicating a direct relation between generated polarons in PAni by acid-base doping-dedoping and photoluminescence spectra of PAni. The observed low luminescence in PAni has been modeled using exciton quenching by polarons through charge transfer. The investigation also reveals that the effect of exciton quenching by polarons becomes pronounced when the polaron concentration in PAni reaches a density of ∼1017-1018 polarons cm-3. To overcome the low emission efficiency of PAni, poly(methyl methacrylate) (PMMA) has been blended with PAni. The blending of donor PMMA (D) with acceptor PAni (A) gives rise to another quantum phenomenon - donor PMMA concentration dependent FRET between PAni (A) and PMMA (D). It is experimentally observed from the photoluminescence measurements of blends that at high donor PMMA concentration above a critical value in the PAni-PMMA polymer blend the emission profile of blends drops sharply. Donor concentration dependent FRET is a contradictory observation with respect to standard concentration independent FRET theory due to competition between inter-layer donor-acceptor and donor-donor intra-layer energy transfer within the donor layer. At high donor concentration intra-donor interaction gradually overtakes inter-layer donor-acceptor FRET which modifies the lifetime of the donor. The modification decreases the quantum yield of the donor and hence emission efficiency of blends above a critical concentration of PMMA by reducing inter donor-acceptor FRET. Thus, polaron exciton quenching and concentration dependent FRET are two dominant physical phenomena controlling luminescence in PAni-PMMA polymer blends. Therefore, optimization of luminescence of PAni-PMMA should be achieved by tuning the factors like reduction of spectral overlap between polarons and excitons in PAni, the density of PAni, diffusion of excitons in blends, and intra donor FRET within the PMMA layer before consideration of the blend being used as an emissive layer in PLEDs.
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Affiliation(s)
- Dhritiman Banerjee
- Micro and Nano Science Laboratory, Department of Applied Physics, Indian Institute of Technology (Indian School of Mines), Dhanbad, Jharkhand-826004, India.
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Fujii M, Sugimoto H, Imakita K. All-inorganic colloidal silicon nanocrystals-surface modification by boron and phosphorus co-doping. NANOTECHNOLOGY 2016; 27:262001. [PMID: 27189818 DOI: 10.1088/0957-4484/27/26/262001] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Si nanocrystals (Si-NCs) with extremely heavily B- and P-doped shells are developed and their structural and optical properties are studied. Unlike conventional Si-NCs without doping, B and P co-doped Si-NCs are dispersible in alcohol and water perfectly without any surface functionalization processes. The colloidal solution of co-doped Si-NCs is very stable and no precipitates are observed for more than 5 years. The co-doped colloidal Si-NCs exhibit size-controllable photoluminescence (PL) in a very wide energy range covering 0.85 to 1.85 eV. In this paper, we summarize the structural and optical properties of co-doped Si-NCs and demonstrate that they are a new type of environmentally-friendly nano-light emitter working in aqueous environments in the visible and near infrared (NIR) ranges.
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Affiliation(s)
- Minoru Fujii
- Department of Electrical and Electronic Engineering, Graduate School of Engineering, Kobe University, Rokkodai, Nada, Kobe 657-8501, Japan
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6
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Furuta K, Fujii M, Sugimoto H, Imakita K. Energy Transfer in Silicon Nanocrystal Solids Made from All-Inorganic Colloidal Silicon Nanocrystals. J Phys Chem Lett 2015; 6:2761-2766. [PMID: 26266860 DOI: 10.1021/acs.jpclett.5b01067] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Energy transfer between silicon (Si) nanocrystals (NCs) in Si-NC solids was demonstrated by photoluminescence (PL) spectroscopy. Clear differences of PL spectra and the decay rates between solutions and solids of Si-NCs were observed. The change in the PL properties caused by the formation of solids could be explained by the energy transfer from small to large NCs in the size distribution. In order to obtain further evidence of NC-to-NC energy transfer, the size distribution was intentionally modified by mixing solutions of NCs with different size distributions. NC solids made from the mixed solutions exhibited significantly different PL spectral shape and decay rates from those made from unmixed solutions, providing clear evidence of NC-to-NC energy transfer in Si-NC solids.
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Affiliation(s)
- Kenta Furuta
- Department of Electrical and Electronic Engineering, Graduate School of Engineering, Kobe University, Rokkodai, Nada, Kobe 657-8501, Japan
| | - Minoru Fujii
- Department of Electrical and Electronic Engineering, Graduate School of Engineering, Kobe University, Rokkodai, Nada, Kobe 657-8501, Japan
| | - Hiroshi Sugimoto
- Department of Electrical and Electronic Engineering, Graduate School of Engineering, Kobe University, Rokkodai, Nada, Kobe 657-8501, Japan
| | - Kenji Imakita
- Department of Electrical and Electronic Engineering, Graduate School of Engineering, Kobe University, Rokkodai, Nada, Kobe 657-8501, Japan
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7
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Dwiecki K, Neunert G, Nogala-Kałucka M, Polewski K. Fluorescence quenching studies on the interaction of catechin-quinone with CdTe quantum dots. Mechanism elucidation and feasibility studies. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2015; 149:523-530. [PMID: 25978020 DOI: 10.1016/j.saa.2015.04.100] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/17/2014] [Accepted: 04/28/2015] [Indexed: 06/04/2023]
Abstract
Changes of the photoluminescent properties of QD in the presence of oxidized catechin (CQ) were investigated by absorption, steady-state fluorescence, fluorescence lifetime and dynamic light scattering measurements. Photoluminescence intensity and fluorescence lifetime was decreasing with increasing CQ concentration. Dynamic light scattering technique found the hydrodynamic diameter of QD suspension in water is in range of 45 nm, whereas in presence of CQ increased to mean values of 67 nm. Calculated from absorption peak position of excition band indicated on average QD size of 3.2 nm. Emission spectroscopy and time-resolved emission studies confirmed preservation of electronic band structure in QD-CQ aggregates. On basis of the presented results, the elucidated mechanism of QD fluorescence quenching is a result of the interaction between QD and CQ due to electron transfer and electrostatic attraction. The results of fluorescence quenching of water-soluble CdTe quantum dot (QD) capped with thiocarboxylic acid were used to implement a simple and fast method to determine the presence of native antioxidant quinones in aqueous solutions. Feasibility studies on this method carried out with oxidized catechin showed a linear relation between the QD emission and quencher concentration, in range from 1 up to 200 μM. The wide linear range of concentration dependence makes it possible to apply this method for the fast and sensitive detection of quinones in solutions.
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Affiliation(s)
- Krzysztof Dwiecki
- Poznan Life Sciences University, Department of Biotechnology and Food Analysis, 60-637 Poznan, ul. Mazowiecka 34, Poland
| | - Grażyna Neunert
- Poznan Life Sciences University, Department of Physics, 60-637 Poznan, ul. Wojska Polskiego 38/42, Poland
| | - Małgorzata Nogala-Kałucka
- Poznan Life Sciences University, Department of Biotechnology and Food Analysis, 60-637 Poznan, ul. Mazowiecka 34, Poland
| | - Krzysztof Polewski
- Poznan Life Sciences University, Department of Physics, 60-637 Poznan, ul. Wojska Polskiego 38/42, Poland.
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8
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Rodrigues SSM, Ribeiro DSM, Frigerio C, Costa SPF, Prior JAV, Pinto PCAG, Santos JLM, Saraiva MLMFS, Passos MLC. Immobilization of Distinctly Capped CdTe Quantum Dots onto Porous Aminated Solid Supports. Chemphyschem 2015; 16:1880-8. [DOI: 10.1002/cphc.201500159] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2015] [Revised: 03/20/2015] [Indexed: 11/07/2022]
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9
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Passos MLC, Pereira M, Saraiva MLMFS, Rangel M, Moniz T, Santos JLM, Frigerio C. Silica nanostructures synthesis and CdTe quantum dots immobilization for photocatalytical applications. RSC Adv 2014. [DOI: 10.1039/c4ra09748c] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A new strategy for the immobilization of semiconductor nanocrystals by carrying out in simultaneous the biomimetic synthesis of silica nanostructures and the encapsulation of MPA-capped CdTe quantum dots (QDs).
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Affiliation(s)
- Marieta L. C. Passos
- REQUIMTE
- Departamento de Ciências Químicas
- Faculdade de Farmácia
- Universidade do Porto
- 4050-313 Porto, Portugal
| | - Mariana Pereira
- REQUIMTE
- Departamento de Ciências Químicas
- Faculdade de Farmácia
- Universidade do Porto
- 4050-313 Porto, Portugal
| | - M. Lúcia M. F. S. Saraiva
- REQUIMTE
- Departamento de Ciências Químicas
- Faculdade de Farmácia
- Universidade do Porto
- 4050-313 Porto, Portugal
| | - Maria Rangel
- REQUIMTE
- Instituto de Ciências Biomédicas de Abel Salazar
- Universidade do Porto
- 4050-313, Porto, Portugal
| | - Tania Moniz
- REQUIMTE
- Departamento de Química e Bioquímica
- Faculdade de Ciências
- Universidade do Porto
- 4169-007 Porto, Portugal
| | - João L. M. Santos
- REQUIMTE
- Departamento de Ciências Químicas
- Faculdade de Farmácia
- Universidade do Porto
- 4050-313 Porto, Portugal
| | - Christian Frigerio
- REQUIMTE
- Departamento de Química e Bioquímica
- Faculdade de Ciências
- Universidade do Porto
- 4169-007 Porto, Portugal
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10
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Effect of CdS Interlayer on Properties of CdTe Based Quantum Dots. J CLUST SCI 2013. [DOI: 10.1007/s10876-013-0552-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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11
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Hydrothermal Synthesis of High-Quality Thiol-Stabilized CdTexSe1-x Alloyed Quantum Dots. J Fluoresc 2013; 23:1247-54. [DOI: 10.1007/s10895-013-1256-0] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2013] [Accepted: 06/24/2013] [Indexed: 10/26/2022]
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12
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Frigerio C, Santos JLM, Barbosa JAC, Eaton P, Saraiva MLMFS, Passos MLC. A soft strategy for covalent immobilization of glutathione and cysteine capped quantum dots onto amino functionalized surfaces. Chem Commun (Camb) 2013; 49:2518-20. [DOI: 10.1039/c3cc00145h] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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13
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Gotesman G, Guliamov R, Naaman R. Horizontal versus vertical charge and energy transfer in hybrid assemblies of semiconductor nanoparticles. BEILSTEIN JOURNAL OF NANOTECHNOLOGY 2012; 3:629-36. [PMID: 23019559 PMCID: PMC3458609 DOI: 10.3762/bjnano.3.72] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/27/2012] [Accepted: 08/24/2012] [Indexed: 06/01/2023]
Abstract
We studied the photoluminescence and time-resolved photoluminescence from self-assembled bilayers of donor and acceptor nanoparticles (NPs) adsorbed on a quartz substrate through organic linkers. Charge and energy transfer processes within the assemblies were investigated as a function of the length of the dithiolated linker (DT) between the donors and acceptors. We found an unusual linker-length-dependency in the emission of the donors. This dependency may be explained by charge and energy transfer processes in the vertical direction (from the donors to the acceptors) that depend strongly on charge transfer processes occurring in the horizontal plane (within the monolayer of the acceptor), namely, parallel to the substrate.
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Affiliation(s)
- Gilad Gotesman
- Department of Chemical Physics, The Weizmann Institute of Science, Rehovot 76100, Israel
| | - Rahamim Guliamov
- Department of Chemical Physics, The Weizmann Institute of Science, Rehovot 76100, Israel
| | - Ron Naaman
- Department of Chemical Physics, The Weizmann Institute of Science, Rehovot 76100, Israel
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14
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Kim S, Yoon SJ, Park SY. Highly Fluorescent Chameleon Nanoparticles and Polymer Films: Multicomponent Organic Systems that Combine FRET and Photochromic Switching. J Am Chem Soc 2012; 134:12091-7. [DOI: 10.1021/ja3027295] [Citation(s) in RCA: 115] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Sanghoon Kim
- Center for
Supramolecular Optoelectronic Materials
and WCU Hybrid Materials Program, Department of Materials Science
and Engineering, Seoul National University, Seoul 151-744, Korea
| | - Seong-Jun Yoon
- Center for
Supramolecular Optoelectronic Materials
and WCU Hybrid Materials Program, Department of Materials Science
and Engineering, Seoul National University, Seoul 151-744, Korea
| | - Soo Young Park
- Center for
Supramolecular Optoelectronic Materials
and WCU Hybrid Materials Program, Department of Materials Science
and Engineering, Seoul National University, Seoul 151-744, Korea
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15
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Gao J, Johnson JC. Charge trapping in bright and dark states of coupled PbS quantum dot films. ACS NANO 2012; 6:3292-3303. [PMID: 22462777 DOI: 10.1021/nn300707d] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Analysis of photoluminescence (PL) from chemically treated lead sulfide (PbS) quantum dot (QD) films versus temperature reveals the effects of QD size and ligand binding on the motion of carriers between bright and dark trap states. For strongly coupled QDs, the PL exhibits temperature-dependent quenching and shifting consistent with charges residing in a shallow exponential tail of quasi-localized states below the band gap. The depth of the tail varies from 15 to 40 meV, similar to or smaller than exponential band tail widths measured for polycrystalline Si. The trap state distribution can be manipulated with QD size and surface treatment, and its characterization should provide a clearer picture of charge separation and percolation in disordered QD films than what currently exists.
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Affiliation(s)
- Jianbo Gao
- National Renewable Energy Laboratory, 1617 Cole Boulevard, Golden, Colorado 80401, United States
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16
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Groeneveld E, van Berkum S, van Schooneveld MM, Gloter A, Meeldijk JD, van den Heuvel DJ, Gerritsen HC, de Mello Donega C. Highly luminescent (Zn,Cd)Te/CdSe colloidal heteronanowires with tunable electron-hole overlap. NANO LETTERS 2012; 12:749-57. [PMID: 22214477 DOI: 10.1021/nl203695m] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
We report the synthesis of ultranarrow (Zn,Cd)Te/CdSe colloidal heteronanowires, using ZnTe magic size clusters as seeds. The wire formation starts with a partial Zn for Cd cation exchange, followed by self-organization into segmented heteronanowires. Further growth occurs by inclusion of CdSe. The heteronanowires emit in the 530 to 760 nm range with high quantum yields. The electron-hole overlap decreases with increasing CdSe volume fraction, allowing the optical properties to be controlled by adjusting the heteronanowire composition.
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Affiliation(s)
- Esther Groeneveld
- Condensed Matter and Interfaces, Debye Institute, Utrecht University, 3508 TA Utrecht, The Netherlands.
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17
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Indication of intracellular physiological pH changes by l-cysteine-coated CdTe quantum dots with an acute alteration in emission color. Biosens Bioelectron 2011; 30:324-7. [DOI: 10.1016/j.bios.2011.09.005] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2011] [Revised: 08/25/2011] [Accepted: 09/09/2011] [Indexed: 11/17/2022]
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18
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Yuan Z, Zhang A, Cao Y, Yang J, Zhu Y, Yang P. Effect of mercaptocarboxylic acids on luminescent properties of CdTe quantum dots. J Fluoresc 2011; 22:121-7. [PMID: 21850430 DOI: 10.1007/s10895-011-0937-9] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2011] [Accepted: 07/28/2011] [Indexed: 11/28/2022]
Abstract
CdTe quantum dots (QDs) were prepared in an aqueous solution using various mercaptocarboxylic acids, such as 3-mercaptopropionic acid (MPA) and thioglycolic acid (TGA), as stabilizing agents. The experimental result indicated that these stabilizing agents played an important role for the properties of the QDs. Although both TGA and MPA-capped CdTe QDs exhibited the tunable photoluminescence (PL) from green to red color, the TGA-capped QDs revealed a higher PL quantum yield (QY) up to 60% than that of MPA-capped QDs (up to 50%) by using the optimum preparation conditions, such as a pH value of ~11.2 and a TGA/Cd molar ratio of 1.5. PL lifetime measurements indicate that the TGA-capped QDs exhibited a short average lifetime while the MPA-capped QDs revealed a long one. Furthermore, the average lifetime of the TGA-capped QDs increased with the increase of the QDs size, while a decreased lifetime for the MPA-capped QDs was obtained. This means that the PL lifetime depended strongly on the surface state of the CdTe QDs. These results should be utilized for the preparation and applications of QDs.
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Affiliation(s)
- Zhimin Yuan
- School of Material Science and Engineering, University of Jinan, 250022, Jinan, People's Republic of China
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20
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Abstract
Colloidal heteronanocrystals (HNCs) can be regarded as solution-grown inorganic-organic hybrid nanomaterials, since they consist of inorganic nanoparticles that are coated with a layer of organic ligand molecules. The hybrid nature of these nanostructures provides great flexibility in engineering their physical and chemical properties. The inorganic particles are heterostructured, i.e. they comprise two (or more) different materials joined together, what gives them remarkable and unique properties that can be controlled by the composition, size and shape of each component of the HNC. The interaction between the inorganic component and the organic ligand molecules allows the size and shape of the HNCs to be controlled and gives rise to novel properties. Moreover, the organic surfactant layer opens up the possibility of surface chemistry manipulation, making it possible to tailor a number of properties. These features have turned colloidal HNCs into promising materials for a number of applications, spurring a growing interest on the investigation of their preparation and properties. This critical review provides an overview of recent developments in this rapidly expanding field, with emphasis on semiconductor HNCs (e.g., quantum dots and quantum rods). In addition to defining the state of the art and highlighting the key issues in the field, this review addresses the fundamental physical and chemical principles needed to understand the properties and preparation of colloidal HNCs (283 references).
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Affiliation(s)
- Celso de Mello Donegá
- Debye Institute for Nanomaterials Science, Utrecht University, Princetonplein 5, 3584 CC Utrecht, Netherlands.
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21
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Rogach AL, Klar TA, Lupton JM, Meijerink A, Feldmann J. Energy transfer with semiconductor nanocrystals. ACTA ACUST UNITED AC 2009. [DOI: 10.1039/b812884g] [Citation(s) in RCA: 186] [Impact Index Per Article: 12.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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22
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Hou Y, Ye J, Gui Z, Zhang G. Temperature-modulated photoluminescence of quantum dots. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2008; 24:9682-9685. [PMID: 18642864 DOI: 10.1021/la800312u] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Cadmium sulfide (CdS) quantum dots (QDs) grafted with thermoresponsive poly( N-isopropylacrylamide) chains have been prepared. As the temperature increases, PNIPAM chains shrink and aggregate so that the QDs exhibit enhanced fluorescence emission. At a temperature around the lower critical solution temperature (LCST) of PNIPAM, the fluorescence exhibits a maximum intensity. Our experiments reveal that the fluorescence emission is determined by the interactions between QDs as a function of the interdot distance. The optical interdot distance for the maximum luminescence intensity is approximately 10 nm. The chain length of PNIPAM also has an effect on the luminescence. Short PNIPAM chains are difficult to associate, leading to a large interdot distance, so that the luminescence intensity changes slightly with temperature.
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Affiliation(s)
- Yi Hou
- Hefei National Laboratory for Physical Sciences at Microscale and State Key Laboratory of Fire Science, Department of Chemical Physics, University of Science and Technology of China
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23
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Feng CL, Zhong XH, Steinhart M, Caminade AM, Majoral JP, Knoll W. Functional quantum-dot/dendrimer nanotubes for sensitive detection of DNA hybridization. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2008; 4:566-571. [PMID: 18384038 DOI: 10.1002/smll.200700453] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Affiliation(s)
- Chuan Liang Feng
- Max Planck Institute for Polymer Research Ackermannweg 10, 55128 Mainz, Germany
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Vaidya SV, Gilchrist ML, Maldarelli C, Couzis A. Spectral Bar Coding of Polystyrene Microbeads Using Multicolored Quantum Dots. Anal Chem 2007; 79:8520-30. [DOI: 10.1021/ac0710533] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Shyam V. Vaidya
- Chemical Engineering Department, The City College and The Graduate Center of the City University of New York, and Levich Institute, The City College of the City University of New York, New York, New York 10031
| | - M. Lane Gilchrist
- Chemical Engineering Department, The City College and The Graduate Center of the City University of New York, and Levich Institute, The City College of the City University of New York, New York, New York 10031
| | - Charles Maldarelli
- Chemical Engineering Department, The City College and The Graduate Center of the City University of New York, and Levich Institute, The City College of the City University of New York, New York, New York 10031
| | - Alexander Couzis
- Chemical Engineering Department, The City College and The Graduate Center of the City University of New York, and Levich Institute, The City College of the City University of New York, New York, New York 10031
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Koole R, Liljeroth P, de Mello Donega C, Vanmaekelbergh D, Meijerink A. Electronic Coupling and Exciton Energy Transfer in CdTe Quantum-Dot Molecules. J Am Chem Soc 2006; 128:10436-41. [PMID: 16895408 DOI: 10.1021/ja061608w] [Citation(s) in RCA: 207] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Stable dispersions of molecularlike aggregates of CdTe quantum dots are prepared by chemical cross-linking. Cryo-TEM images confirm the presence of cross-linked quantum dots and show that the size of the small aggregates can be controlled by the amount of cross-linker added. Optical measurements reveal two types of interdot interactions within these quantum-dot molecules: exciton energy transfer and electronic coupling. Quantitative information on the energy transfer rates in quantum-dot molecules is obtained by photoluminescence lifetime measurements. The degree of electronic coupling is dependent on the size of the quantum dots, which is supported by quantum mechanical calculations.
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Affiliation(s)
- Rolf Koole
- Debye Institute, Condensed Matter and Interfaces, Utrecht University, P.O. Box 80 000, 3508 TA Utrecht, The Netherlands.
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Schöps O, Le Thomas N, Woggon U, Artemyev MV. Recombination Dynamics of CdTe/CdS Core−Shell Nanocrystals. J Phys Chem B 2006; 110:2074-9. [PMID: 16471785 DOI: 10.1021/jp0557013] [Citation(s) in RCA: 89] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The recombination dynamics of zinc-blende-type, deep-red emitting CdTe/CdS core-shell nanocrystals is studied over a wide temperature range. Two characteristic decay regimes are found: a temperature-dependent decay component of a few nanoseconds and a long-living temperature-independent component of approximately 315 ns. The average decay time of the exciton states changes from 20 to 5ns when the temperature is increased from 15 to 295 K. At low temperatures, the observed decay behavior is assigned to thermally induced population and decay of the allowed exchange-split exciton states. At temperatures above T>100 K, nonradiative decay channels involving phonons start to contribute to the exciton recombination. The observed broad distribution in decay times, monitored by stretched exponential fitting functions, we explain by variations in the electron-hole overlap caused by a partly incomplete CdTe/CdS core-shell structure and the nearly energy-degenerated bright and dark state superposition.
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Affiliation(s)
- O Schöps
- Fachbereich Physik, Universität Dortmund, Otto-Hahn-Str. 4, 44227 Dortmund, Germany
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