Non‐Blinking Single‐Photon Generation with Anisotropic Colloidal Nanocrystals: Towards Room‐Temperature, Efficient, Colloidal Quantum Sources

Pisanello, Ferruccio; Leménager, Godefroy; Martiradonna, Luigi; Carbone, Luigi; Vezzoli, Stefano; Desfonds, Pascal; Cozzoli, P. Davide; Hermier, Jean-Pierre; Giacobino, E.; Cingolani, R.; Vittorio, Massimo De; Bramati, Alberto

doi:10.1002/adma.201203171

Cited by 62 publications

(73 citation statements)

References 58 publications

(124 reference statements)

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“…We used high quality CdSe/CdS core-shell DRs synthesized using the seeded growth approach proposed in reference 5,11 . A transmission electron microscope (TEM) image of the investigated sample before dilution is presented in Fig.1a.…”

Section: Experimental Set-upmentioning

confidence: 99%

“…The DRs investigated in this study are well described by a fast switching (flickering) between two states of emission: a bright state with a high emission efficiency and a grey state with a lower emission efficiency 11,17 . The emission efficiency is assessed by the quantum yield (QY) which is given by the ratio between the radiative decay rate and the total decay rate due to radiative and non-radiative relaxations.…”

Section: Flickeringmentioning

confidence: 99%

“…Auger process in colloidal nanocrystals is at the origin of single-photon emission 4,14 and it is suggested to be involved in blinking process 11,15,16 in such structures. Auger effect is a three-charge process in which the recombination energy of an electron-hole pair is transferred to an additional charge.…”

Section: Introductionmentioning

confidence: 99%

“…Among colloidal NCs, CdSe/CdS dot-in-rods (DRs) made up by a spherical core of CdSe surrounded by a rod-like shell of CdS 5 have interesting features as single photon emitters such as a high degree of linear polarization [6][7][8][9][10] and a strongly reduced emission intermittency (non-blinking emission) when synthesized with thick CdS shells 11 . The emission of these nanostuctures at room temperature comes from the relaxation of various states, namely the exciton, the charged exciton and the neutral and charged multiexcitons.…”

Section: Introductionmentioning

confidence: 99%

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Effect of charging on CdSe/CdS dot-in-rods single-photon emission

et al. 2014

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The photon statistics of CdSe/CdS dot-in-rods nanocrystals is studied with a method involving post-selection of the photon detection events based on the photoluminescence count rate. We show that flickering between two states needs to be taken into account to interpret the single-photon emission properties. With post-selection we are able to identify two emitting states: the exciton and the charged exciton (trion), characterized by different lifetimes and different second order correlation functions. Measurements of the second order autocorrelation function at zero delay with postselection shows a degradation of the single photon emission for CdSe/CdS dot-in-rods in a charged state that we explain by deriving the neutral and charged biexciton quantum yields.

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Section: Experimental Set-upmentioning

confidence: 99%

Section: Flickeringmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of charging on CdSe/CdS dot-in-rods single-photon emission

et al. 2014

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“…[1][2][3][4][5] The vast majority of research has been directed into improving the optical properties of quantum dots by increasing quantum yields (QYs), [6][7][8] photostability, [9,10] increasing the range of optical activity [11][12][13] and eliminating "blinking". [14][15][16] Enhancement of the optical properties and QYs relies on the reduction of surface defects in the QD lattice fringes. These surface defects "trap" excitons, preventing electronhole recombination.…”

mentioning

confidence: 99%

Doping Group IIB Metal Ions into Quantum Dot Shells via the One‐Pot Decomposition of Metal‐Dithiocarbamates

Bear

Hollingsworth

Roffey

et al. 2015

Advanced Optical Materials

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(2015). Doping group IIB metal ions into quantum dot shells via the one-pot decomposition of metaldithiocarbamates. Advanced Optical Materials. DOI: 10.1002/adom.201400570 Citing this paper Please note that where the full-text provided on King's Research Portal is the Author Accepted Manuscript or Post-Print version this may differ from the final Published version. If citing, it is advised that you check and use the publisher's definitive version for pagination, volume/issue, and date of publication details. And where the final published version is provided on the Research Portal, if citing you are again advised to check the publisher's website for any subsequent corrections. General rightsCopyright and moral rights for the publications made accessible in the Research Portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognize and abide by the legal requirements associated with these rights.•Users may download and print one copy of any publication from the Research Portal for the purpose of private study or research.•You may not further distribute the material or use it for any profit-making activity or commercial gain •You may freely distribute the URL identifying the publication in the Research Portal Take down policy If you believe that this document breaches copyright please contact librarypure@kcl.ac.uk providing details, and we will remove access to the work immediately and investigate your claim. Quantum dots were characterised and interrogated using TEM, HRTEM, electron diffraction, ToF-SIMS, XPS, EDS spectroscopy, photoluminescence emission and lifetime spectroscopy and UV/vis spectroscopy.

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Anisotropic3DColloidal Quantum Nanostructures

Govan¹,

Spiridonov

Fëdorov

et al. 2016

Encyclopedia of Inorganic and Bioinorganic Chemistry

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3D anisotropic semiconductor nanostructures have unique physical properties including a high aspect ratio, optical polarization anisotropy, polarized photoluminescence, giant birefringence, and many others. Theoretical studies of anisotropic semiconductor nanostructures have shown that their electronic and optical properties dramatically depend on their shape and size. These factors open up an access to new generation of optical, optoelectronic, and light‐harvesting devices. In this article, we demonstrate advances in the development of new 3D quantum‐confined colloidal nanostructures such as semiconductor nanotetrapods, nanomultipods, nanoflowers, nanostar and other shapes. We present the latest progress in various colloidal chemistry approaches for the synthesis of these nanostructures. We also consider the self‐organization of quantum dots in 3D superparticles. We discuss structure–property relations as well as the corresponding potential applications of these nanomaterials in light‐harvesting, energy‐conversion devices, sensing, photocatalysis, biology, and other areas. Finally, we provide conclusions and an outlook for the future development of anisotropic semiconductor nanomaterials and their technological prospects.

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Non‐Blinking Single‐Photon Generation with Anisotropic Colloidal Nanocrystals: Towards Room‐Temperature, Efficient, Colloidal Quantum Sources

Abstract: Blinking and single-photon emission can be tailored in CdSe/CdS core/shell colloidal dot-in-rods. By increasing the shell thickness it is possible to obtain almost non-blinking nanocrystals, while the shell length can be used to control single-photon emission probability.

Cited by 62 publications

References 58 publications

Effect of charging on CdSe/CdS dot-in-rods single-photon emission

Effect of charging on CdSe/CdS dot-in-rods single-photon emission

Doping Group IIB Metal Ions into Quantum Dot Shells via the One‐Pot Decomposition of Metal‐Dithiocarbamates

Anisotropic3DColloidal Quantum Nanostructures

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