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Nanomaterials
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Fluorescent Quantum Dot Nanomaterials
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Fluorescent Quantum Dot Nanomaterials

A special issue of Nanomaterials (ISSN 2079-4991).

Deadline for manuscript submissions: closed (1 April 2023) | Viewed by 4972

Special Issue Editors

Prof. Dr. Qishu Qu

E-Mail Website
Guest Editor
Key Laboratory of Functional Molecule Design and Interface Process, School of Materials and Chemical Engineering, Anhui Jianzhu University, Hefei 230601, China
Interests: stationary phase; SiO2; TiO2; ZrO2; core-shell; high performance liquid chromatography
Dr. Xiufang Wang

E-Mail Website
Guest Editor
School of Materials and Chemical Engineering, Anhui Jianzhu University, Hefei 230601, China
Interests: heterogeneous catalysis; SERS and fluorescence sensors

Special Issue Information

Dear Colleagues,

Photoluminescent carbon quantum dots have excellent optical properties, good biocompatibility, high chemical stability as well as low toxicity. As new-generation photoluminescent nanomaterials, they have extensive potential applications in bioimaging, optoelectronics, photocatalysis and solar energy harvesting. So, great efforts have been exerted on the preparation of carbon quantum dots from a variety of carbon precursors by various methods, such as arc discharge, electrochemical oxidation, combustion, thermal decomposition or oxidation, and microwave-assisted pyrolysis. However, most of these routes suffer from expensive equipment, harsh synthetic conditions, and tedious processes, leading to manufacturing difficulties and high costs for large-scale production. Moreover, the resultant carbon quantum dots usually show low photoluminescence quantum yields, which inhibits their widespread use. It is critical to search for new carbon sources to synthesize carbon quantum dots with high photoluminescence for application in various fields.

The present Special Issue of Nanomaterials is aimed at presenting the current state-of-the-art in the use of quantum dots as fluorescent materials in bioimaging, optoelectronics, photocatalysis and solar energy harvesting. In the present Special Issue, we invite authors to contribute original research articles and review articles covering the current progress on fluorescent or phosphorescence quantum dot materials.

Prof. Dr. Qishu Qu
Dr. Xiufang Wang
Guest Editors

Manuscript Submission Information

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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 2400 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

  • quantum dot
  • nanomaterials
  • fluorescence
  • functionalization
  • bioimaging
  • optoelectronics
  • photocatalysis
  • solar energy harvesting

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Published Papers (4 papers)

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13 pages, 27897 KB  
Article
Polyvinyl Butyral Polymeric Host Material-Based Fluorescent Thin Films to Achieve Highly Efficient Red and Green Colour Conversion for Advanced Next-Generation Displays
by Ashish Gaurav, Yi-Shan Lin, Chih-Yuan Tsai, Jung-Kuan Huang and Ching-Fuh Lin
Nanomaterials 2023, 13(6), 1009; https://doi.org/10.3390/nano13061009 - 10 Mar 2023
Cited by 12 | Viewed by 3552
Abstract
Rare-earth element-free fluorescent materials are eco-friendlier than other traditional fluorescent precursors, such as quantum dots and phosphors. In this study, we explore a simple and facile solution-based technique to prepare fluorescent films, which are highly stable under ordinary room conditions and show hydrophobic [...] Read more.
Rare-earth element-free fluorescent materials are eco-friendlier than other traditional fluorescent precursors, such as quantum dots and phosphors. In this study, we explore a simple and facile solution-based technique to prepare fluorescent films, which are highly stable under ordinary room conditions and show hydrophobic behaviour. The proposed hybrid material was designed with hybrid composites that use polyvinyl butyral (PVB) as a host doped with organic dyes. The red and green fluorescent films exhibited quantum yields of 89% and 80%, respectively, and both are very uniform in thickness and water resistant. Additionally, PVB was further compared with another polymeric host, such as polyvinylpyrrolidone (PVP), to evaluate their binding ability and encapsulation behaviour. Next, the effect of PVB on the optical and chemical properties of the fluorescent materials was studied using UV spectroscopy and Fourier transform infrared spectroscopy. The analysis revealed that no new bond was formed between the host material and fluorescent precursor during the process, with intermolecular forces being present between different molecules. Moreover, the thickness of the fluorescent film and quantum yield relation were evaluated. Finally, the hydrophobic nature, strong binding ability, and optical enhancement by PVB provide a powerful tool for fabricating a highly efficient fluorescent film with enhanced stability in an external environment based on its promising encapsulation properties. These efficient fluorescent films have a bright potential in colour conversion for next-generation display applications. Full article
(This article belongs to the Special Issue Fluorescent Quantum Dot Nanomaterials)
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16 pages, 3714 KB  
Article
Highly Stable and Photoluminescent CsPbBr3/Cs4PbBr6 Composites for White-Light-Emitting Diodes and Visible Light Communication
by Longshi Rao, Bin Sun, Yang Liu, Guisheng Zhong, Mingfu Wen, Jiayang Zhang, Ting Fu, Shuangxi Wang, Fengtao Wang and Xiaodong Niu
Nanomaterials 2023, 13(2), 355; https://doi.org/10.3390/nano13020355 - 15 Jan 2023
Cited by 19 | Viewed by 3633
Abstract
Inorganic lead halide perovskite is one of the most excellent fluorescent materials, and it plays an essential role in high-definition display and visible light communication (VLC). Its photochromic properties and stability determine the final performance of light-emitting devices. However, efficiently synthesizing perovskite with [...] Read more.
Inorganic lead halide perovskite is one of the most excellent fluorescent materials, and it plays an essential role in high-definition display and visible light communication (VLC). Its photochromic properties and stability determine the final performance of light-emitting devices. However, efficiently synthesizing perovskite with high quality and stability remains a significant challenge. Here, we develop a facile and environmentally friendly method for preparing high-stability and strong-emission CsPbBr3/Cs4PbBr6 composites using ultrasonication and liquid paraffin. Tuning the contents of liquid paraffin, bright-emission CsPbBr3/Cs4PbBr6 composite powders with a maximum PLQY of 74% were achieved. Thanks to the protection of the Cs4PbBr6 matrix and liquid paraffin, the photostability, thermostability, and polar solvent stability of CsPbBr3/Cs4PbBr6-LP are significantly improved compared to CsPbBr3 quantum dots and CsPbBr3/Cs4PbBr6 composites that were prepared without liquid paraffin. Moreover, the fabricated CsPbBr3/Cs4PbBr6-LP-based WLEDs show excellent luminescent performance with a power efficiency of 129.5 lm/W and a wide color gamut, with 121% of the NTSC and 94% of the Rec. 2020, demonstrating a promising candidate for displays. In addition, the CsPbBr3/Cs4PbBr6-LP-based WLEDs were also demonstrated in a VLC system. The results suggested the great potential of these high-performance WLEDs as an excitation light source to achieve VLC. Full article
(This article belongs to the Special Issue Fluorescent Quantum Dot Nanomaterials)
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18 pages, 4316 KB  
Article
The Influence of Medium on Fluorescence Quenching of Colloidal Solutions of the Nd3+: LaF3 Nanoparticles Prepared with HTMW Treatment
by Elena Timofeeva, Elena Orlovskaya, Alexandr Popov, Artem Shaidulin, Sergei Kuznetsov, Alexandr Alexandrov, Oleg Uvarov, Yuri Vainer, Gleb Silaev, Mihkel Rähn, Aile Tamm, Stanislav Fedorenko and Yurii Orlovskii
Nanomaterials 2022, 12(21), 3749; https://doi.org/10.3390/nano12213749 - 25 Oct 2022
Cited by 4 | Viewed by 2056
Abstract
An original method was proposed to reduce the quenching of the NIR fluorescence of colloidal solutions of 0.1 at. % Nd3+: LaF3 nanoparticles (NPs) synthesized by aqueous co-precipitation method followed by hydrothermal microwave treatment. For this, an aqueous colloidal solution [...] Read more.
An original method was proposed to reduce the quenching of the NIR fluorescence of colloidal solutions of 0.1 at. % Nd3+: LaF3 nanoparticles (NPs) synthesized by aqueous co-precipitation method followed by hydrothermal microwave treatment. For this, an aqueous colloidal solution of NPs was precipitated by centrifugation and dissolved in the same volume of DMSO. The kinetics of static fluorescence quenching of Nd3+ donors of doped NPs dispersed in two solvents was analyzed to determine and to compare the concentrations of OH- quenching acceptors uniformly distributed throughout the volume of the NPs. The dependences of the relative fluorescence quantum yield φ of colloidal solutions on the concentration of OH- groups in the NPs were calculated and were also used to determine concentration of acceptors in the volume of NPs in different solvents. It was found that the concentration of OH- groups in NPs dispersed in DMSO is almost two times lower than in NPs dispersed in water. This gives an almost two-fold increase in the relative fluorescence quantum yield φ for the former. The sizes of synthesized NPs were monitored by common TEM and by applying a rapid procedure based on optical visualization of the trajectories of the Brownian motion of NPs in solution using a laser ultramicroscope. The use of two different methods made it possible to obtain more detailed information about the studied NPs. Full article
(This article belongs to the Special Issue Fluorescent Quantum Dot Nanomaterials)
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9 pages, 1830 KB  
Article
One-Step Hydrothermal Synthesis of Highly Fluorescent MoS2 Quantum Dots for Lead Ion Detection in Aqueous Solutions
by Luogang Xie, Yang Yang, Gaoshang Gong, Shiquan Feng and Dewei Liu
Nanomaterials 2022, 12(19), 3329; https://doi.org/10.3390/nano12193329 - 24 Sep 2022
Cited by 14 | Viewed by 2797
Abstract
Lead ions in water are harmful to human health and ecosystems because of their high toxicity and nondegradability. It is important to explore effective fluorescence probes for Pb2+ detection. In this work, surface-functionalized molybdenum disulfide quantum dots (MoS2 QDs) were prepared [...] Read more.
Lead ions in water are harmful to human health and ecosystems because of their high toxicity and nondegradability. It is important to explore effective fluorescence probes for Pb2+ detection. In this work, surface-functionalized molybdenum disulfide quantum dots (MoS2 QDs) were prepared using a hydrothermal method, and ammonium tetrathiomolybdate and glutathione were used as precursors. The photoluminescence quantum yield of MoS2 QDs can be improved to 20.4%, which is higher than that for MoS2 QDs reported in current research. The as-prepared MoS2 QDs demonstrate high selectivity and sensitivity for Pb2+ ions, and the limit of detection is 0.056 μM. The photoluminescence decay dynamics for MoS2 QDs in the presence of Pb2+ ions in different concentrations indicate that the fluorescence quenching originated from nonradiative electron transfer from excited MoS2 QDs to the Pb2+ ion. The prepared MoS2 QDs have great prospect and are expected to become a good method for lead ion detection. Full article
(This article belongs to the Special Issue Fluorescent Quantum Dot Nanomaterials)
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