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Nanomaterials
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Luminescent Colloidal Nanocrystals
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Luminescent Colloidal Nanocrystals

A special issue of Nanomaterials (ISSN 2079-4991). This special issue belongs to the section "Nanocomposite Materials".

Deadline for manuscript submissions: closed (31 December 2022) | Viewed by 18921

Special Issue Editor

Dr. Aleksandr P. Litvin

E-Mail Website
Guest Editor
Laboratory “Optics of Quantum Nanostructures”, ITMO University, Saint Petersburg, Russia
Interests: colloidal nanocrystals; luminescent nanoparticles; quantum dots; perovskites; energy transfer; optical properties; spectroscopy

Special Issue Information

Dear Colleagues,

In the last decade, luminescent colloidal nanocrystals attracted enormous attention because of both their excellent optical properties and solution processability. A large number of approaches to synthesis, post-synthetic processing, and functionalization have been developed for semiconductor quantum dots and, later, perovskite nanocrystals. The tunability of the physical and chemical properties of luminescent colloidal nanocrystals creates vast possibilities to utilize them in several applications, including optoelectronics, biology, medicine, computing, etc. For most applications, high quantum yield and stability will be the key properties, but often the concentration and mobility of charge carriers, photoluminescence decay time, spectral line purity, or biocompatibility play an important role. To achieve the desired properties, one can tune their chemical compound, size, and shape, or use heterostructuring and doping. The properties of the colloidal nanocrystals can be crucially changed during the formation of their close-packed or ordered structures and their complexes with different nanomaterials.

This Special Issue will publish state-of-the-art manuscripts concerning the synthesis, post-synthetic treatment, optical and electronic properties of the luminescent colloidal nanocrystals and their complexes with different nanostructures. The topics of the Special Issue include but are not limited to the following:

  • Synthesis of the luminescent colloidal nanocrystals including quantum dots and perovskite nanocrystals of different size and shape;
  • Post-synthetic treatment of the luminescent colloidal nanocrystals;
  • Self-assembly;
  • Doping and heterostructuring;
  • Formation of complexes of the luminescent colloidal nanocrystals with other nanomaterials including graphene, TMDs, polymers, plasmonic nanoparticles, etc.
  • Optical and electronic properties of the luminescent colloidal nanocrystals and their complexes;
  • Energy and charge transfer phenomena in the luminescent colloidal nanocrystals and their complexes;
  • Dynamics of elementary excitations and relaxation processes in the luminescent colloidal nanocrystals and their complexes;
  • Theoretical modeling of related physical properties and processes

Dr. Aleksandr P. Litvin
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Nanomaterials is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2900 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • Colloidal nanocrystals
  • Luminescent nanoparticles
  • Quantum dots
  • Perovskites
  • Energy transfer
  • Optical properties
  • Spectroscopy

Published Papers (8 papers)

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Editorial

Jump to: Research

3 pages, 176 KiB  
Editorial
Editorial for Special Issue “Luminescent Colloidal Nanocrystals”
by Aleksandr P. Litvin
Nanomaterials 2023, 13(3), 607; https://0-doi-org.brum.beds.ac.uk/10.3390/nano13030607 - 02 Feb 2023
Viewed by 752
Abstract
The field of luminescent colloidal nanocrystals and the numerous nanosystems based on them has recently made a rapid breakthrough from initial basic research to real applications and devices [...] Full article
(This article belongs to the Special Issue Luminescent Colloidal Nanocrystals)

Research

Jump to: Editorial

20 pages, 2734 KiB  
Article
Magneto-Induced Hyperthermia and Temperature Detection in Single Iron Oxide Core-Silica/Tb3+/Eu3+(Acac) Shell Nano-Objects
by Karina Nigoghossian, Basile Bouvet, Gautier Félix, Saad Sene, Luca Costa, Pierre-Emmanuel Milhet, Albano N. Carneiro Neto, Luis D. Carlos, Erwan Oliviero, Yannick Guari and Joulia Larionova
Nanomaterials 2022, 12(18), 3109; https://0-doi-org.brum.beds.ac.uk/10.3390/nano12183109 - 07 Sep 2022
Cited by 6 | Viewed by 1755
Abstract
Multifunctional nano-objects containing a magnetic heater and a temperature emissive sensor in the same nanoparticle have recently emerged as promising tools towards personalized nanomedicine permitting hyperthermia-assisted treatment under local temperature control. However, a fine control of nano-systems’ morphology permitting the synthesis of a [...] Read more.
Multifunctional nano-objects containing a magnetic heater and a temperature emissive sensor in the same nanoparticle have recently emerged as promising tools towards personalized nanomedicine permitting hyperthermia-assisted treatment under local temperature control. However, a fine control of nano-systems’ morphology permitting the synthesis of a single magnetic core with controlled position of the sensor presents a main challenge. We report here the design of new iron oxide core–silica shell nano-objects containing luminescent Tb3+/Eu3+-(acetylacetonate) moieties covalently anchored to the silica surface, which act as a promising heater/thermometer system. They present a single magnetic core and a controlled thickness of the silica shell, permitting a uniform spatial distribution of the emissive nanothermometer relative to the heat source. These nanoparticles exhibit the Tb3+ and Eu3+ characteristic emissions and suitable magnetic properties that make them efficient as a nanoheater with a Ln3+-based emissive self-referencing temperature sensor covalently coupled to it. Heating capacity under an alternating current magnetic field was demonstrated by thermal imaging. This system offers a new strategy permitting a rapid heating of a solution under an applied magnetic field and a local self-referencing temperature sensing with excellent thermal sensitivity (1.64%·K−1 (at 40 °C)) in the range 25–70 °C, good photostability, and reproducibility after several heating cycles. Full article
(This article belongs to the Special Issue Luminescent Colloidal Nanocrystals)
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15 pages, 6291 KiB  
Article
Enhancing the Efficiency of Perovskite Solar Cells through Interface Engineering with MoS2 Quantum Dots
by Zhao Luo, Tan Guo, Chen Wang, Jifan Zou, Jianxun Wang, Wei Dong, Jing Li, Wei Zhang, Xiaoyu Zhang and Weitao Zheng
Nanomaterials 2022, 12(17), 3079; https://0-doi-org.brum.beds.ac.uk/10.3390/nano12173079 - 05 Sep 2022
Cited by 11 | Viewed by 2289
Abstract
The interface of perovskite solar cells (PSCs) determines their power conversion efficiency (PCE). Here, the buried bottom surface of a perovskite film is efficiently passivated by using MoS2 quantum dots. The perovskite films prepared on top of MoS2-assisted substrates show [...] Read more.
The interface of perovskite solar cells (PSCs) determines their power conversion efficiency (PCE). Here, the buried bottom surface of a perovskite film is efficiently passivated by using MoS2 quantum dots. The perovskite films prepared on top of MoS2-assisted substrates show enhanced crystallinity, as evidenced by improved photoluminescence and a prolonged emission lifetime. MoS2 quantum dots with a large bandgap of 2.68 eV not only facilitate hole collection but also prevent the photogenerated electrons from flowing to the hole transport layer. Overall promotion leads to decreased trap density and an enhanced built-in electric field, thus increasing the device PCE from 17.87% to 19.95%. Full article
(This article belongs to the Special Issue Luminescent Colloidal Nanocrystals)
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13 pages, 5573 KiB  
Article
Passivator-Free Microwave–Hydrothermal Synthesis of High Quantum Yield Carbon Dots for All-Carbon Fluorescent Nanocomposite Films
by Jiayin Wu, Qilin Lu, Hanchen Wang and Biao Huang
Nanomaterials 2022, 12(15), 2624; https://0-doi-org.brum.beds.ac.uk/10.3390/nano12152624 - 29 Jul 2022
Cited by 4 | Viewed by 1707
Abstract
Based on the self-passivation function of chitosan, an efficient, and green synthesis strategy was applied to prepare chitosan carbon dots (CDs). The quantum yield of carbon dots reached 35% under the conditions of hydrothermal temperature of 200 °C, hydrothermal time of 5 h, [...] Read more.
Based on the self-passivation function of chitosan, an efficient, and green synthesis strategy was applied to prepare chitosan carbon dots (CDs). The quantum yield of carbon dots reached 35% under the conditions of hydrothermal temperature of 200 °C, hydrothermal time of 5 h, and chitosan concentration of 2%. Moreover, the obtained carbon dots had high selectivity and sensitivity to Fe3+. Based on the Schiff base reaction between the aldehyde groups of dialdehyde cellulose nanofibrils (DNF) and the amino groups of CDs, a chemically cross-linked, novel, fluorescent composite film, with high transparency and high strength, was created using one-pot processing. Knowing that the fluorescence effect of the composite film on Fe3+ had a linear relationship in the concentration range of 0–100 μM, a fluorescent probe can be developed for quantitative analysis and detection of Fe3+. Owing to their excellent fluorescent and mechanical properties, the fluorescent nanocomposite films have potential applications in the fields of Fe3+ detection, fluorescent labeling, and biosensing. Full article
(This article belongs to the Special Issue Luminescent Colloidal Nanocrystals)
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14 pages, 2615 KiB  
Article
Carbon Dots with an Emission in the Near Infrared Produced from Organic Dyes in Porous Silica Microsphere Templates
by Evgeniia A. Stepanidenko, Ivan D. Skurlov, Pavel D. Khavlyuk, Dmitry A. Onishchuk, Aleksandra V. Koroleva, Evgeniy V. Zhizhin, Irina A. Arefina, Dmitry A. Kurdyukov, Daniil A. Eurov, Valery G. Golubev, Alexander V. Baranov, Anatoly V. Fedorov, Elena V. Ushakova and Andrey L. Rogach
Nanomaterials 2022, 12(3), 543; https://0-doi-org.brum.beds.ac.uk/10.3390/nano12030543 - 05 Feb 2022
Cited by 12 | Viewed by 3791
Abstract
Carbon dots (CDs) with an emission in the near infrared spectral region are attractive due to their promising applications in bio-related areas, while their fabrication still remains a challenging task. Herein, we developed a template-assisted method using porous silica microspheres for the formation [...] Read more.
Carbon dots (CDs) with an emission in the near infrared spectral region are attractive due to their promising applications in bio-related areas, while their fabrication still remains a challenging task. Herein, we developed a template-assisted method using porous silica microspheres for the formation of CDs with optical transitions in the near infrared. Two organic dyes, Rhodamine 6G and IR1061 with emission in the yellow and near infrared spectral regions, respectively, were used as precursors for CDs. Correlation of morphology and chemical composition with optical properties of obtained CDs revealed the origin of their emission, which is related to the CDs’ core optical transitions and dye-derivatives within CDs. By varying annealing temperature, different kinds of optical centers as derivatives of organic dyes are formed in the microsphere’s pores. The template-assisted method allows us to synthesize CDs with an emission peaked at 1085 nm and photoluminescence quantum yield of 0.2%, which is the highest value reported so far for CDs emitting at wavelengths longer than 1050 nm. Full article
(This article belongs to the Special Issue Luminescent Colloidal Nanocrystals)
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16 pages, 2527 KiB  
Article
Improved One- and Multiple-Photon Excited Photoluminescence from Cd2+-Doped CsPbBr3 Perovskite NCs
by Ivan D. Skurlov, Wenxu Yin, Azat O. Ismagilov, Anton N. Tcypkin, Haohang Hua, Haibo Wang, Xiaoyu Zhang, Aleksandr P. Litvin and Weitao Zheng
Nanomaterials 2022, 12(1), 151; https://0-doi-org.brum.beds.ac.uk/10.3390/nano12010151 - 01 Jan 2022
Cited by 14 | Viewed by 2796
Abstract
Metal halide perovskite nanocrystals (NCs) attract much attention for light-emitting applications due to their exceptional optical properties. More recently, perovskite NCs have begun to be considered a promising material for nonlinear optical applications. Numerous strategies have recently been developed to improve the properties [...] Read more.
Metal halide perovskite nanocrystals (NCs) attract much attention for light-emitting applications due to their exceptional optical properties. More recently, perovskite NCs have begun to be considered a promising material for nonlinear optical applications. Numerous strategies have recently been developed to improve the properties of metal halide perovskite NCs. Among them, B-site doping is one of the most promising ways to enhance their brightness and stability. However, there is a lack of study of the influence of B-site doping on the nonlinear optical properties of inorganic perovskite NCs. Here, we demonstrate that Cd2+ doping simultaneously improves both the linear (higher photoluminescence quantum yield, larger exciton binding energy, reduced trap states density, and faster radiative recombination) and nonlinear (higher two- and three-photon absorption cross-sections) optical properties of CsPbBr3 NCs. Cd2+ doping results in a two-photon absorption cross-section, reaching 2.6 × 106 Goeppert-Mayer (GM), which is among the highest reported for CsPbBr3 NCs. Full article
(This article belongs to the Special Issue Luminescent Colloidal Nanocrystals)
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9 pages, 1502 KiB  
Article
Effect of Reactive Ion Etching on the Luminescence of GeV Color Centers in CVD Diamond Nanocrystals
by Sergey A. Grudinkin, Nikolay A. Feoktistov, Kirill V. Bogdanov, Mikhail A. Baranov, Valery G. Golubev and Alexander V. Baranov
Nanomaterials 2021, 11(11), 2814; https://0-doi-org.brum.beds.ac.uk/10.3390/nano11112814 - 23 Oct 2021
Cited by 8 | Viewed by 2420
Abstract
The negatively charged germanium-vacancy GeV− color centers in diamond nanocrystals are solid-state photon emitters suited for quantum information technologies, bio-sensing, and labeling applications. Due to the small Huang–Rhys factor, the GeV−-center zero-phonon line emission is expected to be very intensive [...] Read more.
The negatively charged germanium-vacancy GeV− color centers in diamond nanocrystals are solid-state photon emitters suited for quantum information technologies, bio-sensing, and labeling applications. Due to the small Huang–Rhys factor, the GeV−-center zero-phonon line emission is expected to be very intensive and spectrally narrow. However, structural defects and the inhomogeneous distribution of local strains in the nanodiamonds result in the essential broadening of the ZPL. Therefore, clarification and elimination of the reasons for the broadening of the GeV− center ZPL is an important problem. We report on the effect of reactive ion etching in oxygen plasma on the structure and luminescence properties of nanodiamonds grown by hot filament chemical vapor deposition. Emission of GeV− color centers ensembles at about 602 nm in as-grown and etched nanodiamonds is probed using micro-photoluminescence and micro-Raman spectroscopy at room and liquid nitrogen temperature. We show that the etching removes the nanodiamond surface sp2-induced defects resulting in a reduction in the broad luminescence background and a narrowing of the diamond Raman band. The zero-phonon luminescence band of the ensemble of the GeV− centers is a superposition of narrow lines originated most likely from the GeV− center sub-ensembles under different uniaxial local strain conditions. Full article
(This article belongs to the Special Issue Luminescent Colloidal Nanocrystals)
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9 pages, 1742 KiB  
Article
Beyond Charge Transfer: The Impact of Auger Recombination and FRET on PL Quenching in an rGO-QDs System
by Anton A. Babaev, Anastasiia V. Sokolova, Sergei A. Cherevkov, Kevin Berwick, Alexander V. Baranov, Anatoly V. Fedorov and Aleksandr P. Litvin
Nanomaterials 2021, 11(6), 1623; https://0-doi-org.brum.beds.ac.uk/10.3390/nano11061623 - 21 Jun 2021
Cited by 2 | Viewed by 2395
Abstract
PL intensity quenching and the PL lifetime reduction of fluorophores located close to graphene derivatives are generally explained by charge and energy transfer processes. Analyzing the PL from PbS QDs in rGO/QD systems, we observed a substantial reduction in average PL lifetimes with [...] Read more.
PL intensity quenching and the PL lifetime reduction of fluorophores located close to graphene derivatives are generally explained by charge and energy transfer processes. Analyzing the PL from PbS QDs in rGO/QD systems, we observed a substantial reduction in average PL lifetimes with an increase in rGO content that cannot be interpreted solely by these two processes. To explain the PL lifetime dependence on the rGO/QD component ratio, we propose a model based on the Auger recombination of excitations involving excess holes left in the QDs after the charge transfer process. To validate the model, we conducted additional experiments involving the external engineering of free charge carriers, which confirmed the role of excess holes as the main QD PL quenching source. A mathematical simulation of the model demonstrated that the energy transfer between neighboring QDs must also be considered to explain the experimental data carefully. Together, Auger recombination and energy transfer simulation offers us an excellent fit for the average PL lifetime dependence on the component ratio of the rGO/QD system. Full article
(This article belongs to the Special Issue Luminescent Colloidal Nanocrystals)
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