1
|
Sayevich V, Robinson ZL, Kim Y, Kozlov OV, Jung H, Nakotte T, Park YS, Klimov VI. Highly versatile near-infrared emitters based on an atomically defined HgS interlayer embedded into a CdSe/CdS quantum dot. NATURE NANOTECHNOLOGY 2021; 16:673-679. [PMID: 33767383 DOI: 10.1038/s41565-021-00871-x] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/02/2020] [Accepted: 01/29/2021] [Indexed: 06/12/2023]
Abstract
The availability of colloidal quantum dots with highly efficient, fast and 'non-blinking' near-infrared emission would benefit numerous applications, from advanced optical communication and quantum networks to biomedical diagnostics. Here, we report high-quality near-infrared emitters that are based on well known CdSe/CdS heterostructures. By incorporating an HgS interlayer at the quantum dot core/shell interface, we convert normally visible emitters into highly efficient near-infrared fluorophores. Employing thermodynamically controlled sequential deposition of metal and chalcogen ions, we achieve atomic-level precision in defining the thickness of the HgS interlayer (H). This manifests in 'quantized' jumps of the photoluminescence spectrum when H changes in discrete, atomic steps. The synthesized structures show highly efficient photoluminescence, tunable from 700 to 1,370 nm, and fast radiative rates of ~1/60 ns-1. The emission from individual CdSe/HgS/CdS colloidal quantum dots is virtually blinking free and exhibits nearly perfect single-photon purity. In addition, when incorporated into a light-emitting-diode architecture, these quantum dots demonstrate strong electroluminescence with a sub-bandgap turn-on voltage.
Collapse
Affiliation(s)
- Vladimir Sayevich
- Chemistry Division, Los Alamos National Laboratory, Los Alamos, NM, USA
| | - Zachary L Robinson
- Chemistry Division, Los Alamos National Laboratory, Los Alamos, NM, USA
- School of Physics and Astronomy, University of Minnesota, Minneapolis, MN, USA
| | - Younghee Kim
- Chemistry Division, Los Alamos National Laboratory, Los Alamos, NM, USA
| | - Oleg V Kozlov
- Chemistry Division, Los Alamos National Laboratory, Los Alamos, NM, USA
| | - Heeyoung Jung
- Chemistry Division, Los Alamos National Laboratory, Los Alamos, NM, USA
| | - Tom Nakotte
- Chemistry Division, Los Alamos National Laboratory, Los Alamos, NM, USA
- Department of Chemical and Materials Engineering, New Mexico State University, Las Cruces, NM, USA
| | - Young-Shin Park
- Chemistry Division, Los Alamos National Laboratory, Los Alamos, NM, USA
- Center for High Technology Materials, University of New Mexico, Albuquerque, NM, USA
| | - Victor I Klimov
- Chemistry Division, Los Alamos National Laboratory, Los Alamos, NM, USA.
| |
Collapse
|
2
|
Au TH, Buil S, Quélin X, Hermier JP, Lai ND. Photostability and long-term preservation of a colloidal semiconductor-based single photon emitter in polymeric photonic structures. NANOSCALE ADVANCES 2019; 1:3225-3231. [PMID: 36133591 PMCID: PMC9417270 DOI: 10.1039/c9na00411d] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/01/2019] [Accepted: 07/03/2019] [Indexed: 05/27/2023]
Abstract
Colloidal semiconductor quantum dots (QDs) are promising candidates for various applications in electronics and quantum optics. However, they are sensitive and vulnerable to the chemical environment due to their highly dynamic surface with a large portion of exposed atoms. Hence, oxidation and detrimental defects on the nanocrystal (NC) interface dramatically deteriorate their optical as well as electrical properties. In this study, a simple strategy is proposed not only to obtain good preservation of colloidal semiconductor QDs by using a protective polymer matrix but also to provide excellent accessibility to micro-fabrication by optical lithography. A high-quality QD-polymer nanocomposite with mono-dispersion of the NCs is synthesized by incorporating the colloidal CdSe/CdS NCs into an SU-8 photoresist. Our approach shows that the oxidation of the core/shell QDs embedded in the SU-8 resist is completely avoidable. The deterministic insertion of multiple QDs or a single QD into photonic structures is demonstrated. Single photon generation is obtained and well-preserved in the nanocomposite and the polymeric structures.
Collapse
Affiliation(s)
- Thi Huong Au
- Laboratoire de Photonique Quantique et Moléculaire, UMR 8537, École Normale Supérieure de Cachan, Centrale Supélec, CNRS, Université Paris-Saclay 61 Avenue du Président Wilson 94235 Cachan Cedex France
- Groupe d'Étude de la Matière Condensée, Université de Versailles Saint-Quentin-en-Yvelines, CNRS UMR 8635, Université Paris-Saclay 45 Avenue des Etats-Unis 78035 Versailles Cedex France
| | - Stéphanie Buil
- Groupe d'Étude de la Matière Condensée, Université de Versailles Saint-Quentin-en-Yvelines, CNRS UMR 8635, Université Paris-Saclay 45 Avenue des Etats-Unis 78035 Versailles Cedex France
| | - Xavier Quélin
- Groupe d'Étude de la Matière Condensée, Université de Versailles Saint-Quentin-en-Yvelines, CNRS UMR 8635, Université Paris-Saclay 45 Avenue des Etats-Unis 78035 Versailles Cedex France
| | - Jean-Pierre Hermier
- Groupe d'Étude de la Matière Condensée, Université de Versailles Saint-Quentin-en-Yvelines, CNRS UMR 8635, Université Paris-Saclay 45 Avenue des Etats-Unis 78035 Versailles Cedex France
| | - Ngoc Diep Lai
- Laboratoire de Photonique Quantique et Moléculaire, UMR 8537, École Normale Supérieure de Cachan, Centrale Supélec, CNRS, Université Paris-Saclay 61 Avenue du Président Wilson 94235 Cachan Cedex France
| |
Collapse
|
3
|
Chen L, Lin J, Yi J, Weng Q, Zhou Y, Han Z, Li C, Chen J, Zhang Q. A tyrosinase-induced fluorescence immunoassay for detection of tau protein using dopamine-functionalized CuInS2/ZnS quantum dots. Anal Bioanal Chem 2019; 411:5277-5285. [DOI: 10.1007/s00216-019-01909-9] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2019] [Revised: 04/24/2019] [Accepted: 05/09/2019] [Indexed: 10/26/2022]
|
4
|
Chen JS, Li M, Cotlet M. Nanoscale Photoinduced Charge Transfer with Individual Quantum Dots: Tunability through Synthesis, Interface Design, and Interaction with Charge Traps. ACS OMEGA 2019; 4:9102-9112. [PMID: 31459998 PMCID: PMC6648770 DOI: 10.1021/acsomega.9b00803] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/22/2019] [Accepted: 05/03/2019] [Indexed: 05/29/2023]
Abstract
Semiconducting colloidal quantum dots (QDs) provide an excellent platform for nanoscale charge-transfer studies. Because of their size-dependent optoelectronic properties, which can be tuned via chemical synthesis and of their versatility in surface ligand exchange, QDs can be coupled with various types of acceptors to create hybrids with controlled type (electron or hole), direction, and rate of charge flow, depending on the foreseen application, either solar harvesting, light emitting, or biosensing. This perspective highlights several examples of QD-based hybrids with controllable (tunable) rate of charge transfer obtained by various approaches, including by changing the QD core size and shell thickness by colloidal synthesis, by the insertion of molecular linkers or dielectric spacers between donor and acceptor components. We also show that subjecting QDs to external factors such as electric fields and alternate optical excitation energy is another approach to bias the internal charge transfer between charges photogenerated in the QD core and QD's surface charge traps. The perspective also provides the reader with various examples of how single nanoparticle spectroscopic studies can help in understanding and quantifying nanoscale charge transfer with QDs.
Collapse
Affiliation(s)
- Jia-Shiang Chen
- Center
for Functional Nanomaterials, Brookhaven
National Laboratory, Upton, New York 11973, United States
- Department
of Materials Science and Chemical Engineering, Stony Brook University, Stony
Brook, New York 11794, United States
| | - Mingxing Li
- Center
for Functional Nanomaterials, Brookhaven
National Laboratory, Upton, New York 11973, United States
| | - Mircea Cotlet
- Center
for Functional Nanomaterials, Brookhaven
National Laboratory, Upton, New York 11973, United States
| |
Collapse
|
5
|
Chen JS, Zang H, Li M, Cotlet M. Hot excitons are responsible for increasing photoluminescence blinking activity in single lead sulfide/cadmium sulfide nanocrystals. Chem Commun (Camb) 2018; 54:495-498. [DOI: 10.1039/c7cc08356d] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The kinetics of PL blinking for isolated PbS/CdS nanocrystals changes with the photon excitation energy, with PL blinking increasing in frequency and changing from a two-state to a multistate on/off switching when the excitation energy changes from 1Sh–1Se (≈1.4 eV) to 1Ph–1Pe (≈2.4 eV).
Collapse
Affiliation(s)
- Jia-Shiang Chen
- Center for Functional Nanomaterials
- Brookhaven National Laboratory
- Upton
- USA
- Department of Materials Science and Chemical Engineering
| | - Huidong Zang
- Center for Functional Nanomaterials
- Brookhaven National Laboratory
- Upton
- USA
| | - Mingxing Li
- Center for Functional Nanomaterials
- Brookhaven National Laboratory
- Upton
- USA
| | - Mircea Cotlet
- Center for Functional Nanomaterials
- Brookhaven National Laboratory
- Upton
- USA
| |
Collapse
|
6
|
Liu L, Hou H, Wang L, Xu R, Lei Y, Shen S, Yang D, Yang W. A transparent CdS@TiO 2 nanotextile photoanode with boosted photoelectrocatalytic efficiency and stability. NANOSCALE 2017; 9:15650-15657. [PMID: 28993825 DOI: 10.1039/c7nr05658c] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
In the present work, we report the exploration of a transparent CdS@TiO2 nanotextile photoanode with boosted photoelectrocatalytic (PEC) efficiency and stability, by the controllable coating of an amorphous TiO2 ultrathin layer via the atomic layer deposition (ALD) technique. The optimal CdS@TiO2 nanotextile photoanode with a 3.5 nm TiO2 ultrathin layer exhibits a photocurrent density of 1.8 mA cm-2 at 0 V vs. RHE, which is 11 times higher than that of the pristine CdS counterpart. The photocatalytic H2 evolution rate of CdS@TiO2 ranges up to 47.5 mmol g-1 h-1, which is superior to those reported for one-dimensional CdS-based counterparts. Moreover, the photocurrent of CdS@TiO2 nanotextile photoanodes shows only 9% decay after 9 h, suggesting its profoundly enhanced PEC stability, in comparison with that of pristine CdS photoanodes (almost down to zero after 3 hours). It is verified that the introduced TiO2 nanoshells could limit the charge recombination, facilitate the charge separation, reduce the charge transfer resistance, and enhance the wettability of the electrodes, resulting in their significantly enhanced PEC performance.
Collapse
Affiliation(s)
- Long Liu
- Institute of Materials, Ningbo University of Technology, Ningbo 315016, P.R. China.
| | | | | | | | | | | | | | | |
Collapse
|