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Nanomaterials
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Low Dimensional Luminescent Nanomaterials and Nanodevices
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Low Dimensional Luminescent Nanomaterials and Nanodevices

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

Deadline for manuscript submissions: closed (31 July 2023) | Viewed by 3765

Special Issue Editors

Dr. Shiliang Mei

E-Mail Website
Guest Editor
Institute for Electric Light Sources, School of Information Science and Technology, Fudan University, Shanghai 200433, China
Interests: quantum dots; metal halide perovskites; ultrafast spectroscopy; electroluminescent devices; advanced display technology
Special Issues, Collections and Topics in MDPI journals
Dr. Xiaoyan Liu

E-Mail Website
Guest Editor
College of Integrated Circuit Science and Engineering, and National and Local Joint Engineering Laboratory for RF Integration and Micro-Packaging Technologies, Nanjing University of Posts and Telecommunications, Nanjing 210023, China
Interests: micro-light-emitting diode; photodetector and optoelectronic memristor based on gallium nitride integrated with nanomaterials, as well as their applications in visible light communication; solid-state lighting; micro-display; artificial intelligence
Dr. Bobo Yang

E-Mail Website
Guest Editor
School of Science, Shanghai Institute of Technology, Shanghai 201418, China
Interests: perovskite; quantum dot; glass; ceramic; crystal; glass ceramic; phosphor; optoelectronic devices; LED; micro-LED

Special Issue Information

Dear Colleagues,

Low-dimensional luminescent nanomaterials, such as quantum dots, nanotubes, nanowires, and 2D materials, have attracted extensive research attention because of their unique quantum confinement effect. Their novel optical and photophysical properties endow them with many promising nanodevices applications, such as light-emitting diodes, lasers, solar cells and luminescent memristors. Nevertheless, there are still many issues with low-dimensional luminescent nanomaterials, such as fundamental photophysical understanding, stability and device performance, which must be addressed and further investigated.

This Special Issue aims to provide an overview of the most recent developments in novel low-dimensional luminescent nanomaterials and nanodevices. Original research articles, reviews and perspectives are welcome. Research areas may include (but are not limited to) the following:

  • Synthesis of low-dimensional luminescent nanomaterials such as quantum dots, metal halide perovskites and quantum-dot-luminescent glasses.
  • Optical and photophysical properties of low-dimensional luminescent nanomaterials.
  • Nanodevices applications in light-emitting diodes, lasers, solar cells and luminescent memristors.

We sincerely hope this Special Issue will help researchers worldwide to understand the latest progress in this research field and encourage even broader research in novel low-dimensional luminescent nanomaterials and nanodevices.

We are looking forward to receiving your contributions.

Dr. Shiliang Mei
Dr. Xiaoyan Liu
Dr. Bobo Yang
Guest Editors

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

  • luminescent nanomaterials
  • quantum dots
  • metal halide perovskites
  • carbon dots
  • quantum-dot-luminescent glass
  • photophysical properties
  • light-emitting diodes
  • lasers
  • solar cells
  • luminescent memristor

Published Papers (3 papers)

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Research

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11 pages, 2245 KiB  
Article
Study on Modulation Bandwidth of GaN-Based Micro-Light-Emitting Diodes by Adjusting Quantum Well Structure
by Pan Yin, Ting Zhi, Tao Tao and Xiaoyan Liu
Nanomaterials 2022, 12(21), 3818; https://doi.org/10.3390/nano12213818 - 28 Oct 2022
Cited by 1 | Viewed by 1262
Abstract
GaN-based blue micro-light-emitting diodes (μ-LEDs) with different structures were designed, of which the effect of quantum well (QW) structure on modulation bandwidth was numerically explored. By using trapezoidal QWs, the quantum-confined Stark effect (QCSE) can be reduced, leading to an enhanced electron-hole wave [...] Read more.
GaN-based blue micro-light-emitting diodes (μ-LEDs) with different structures were designed, of which the effect of quantum well (QW) structure on modulation bandwidth was numerically explored. By using trapezoidal QWs, the quantum-confined Stark effect (QCSE) can be reduced, leading to an enhanced electron-hole wave function overlap, thereby increasing the recombination rate and reducing the differential carrier lifetime. In addition, the improved hole transport also creates favorable conditions for shortening the differential carrier lifetime. Furthermore, by comparing with traditional μ-LEDs with different thicknesses of QW, the modulation bandwidth of μ-LEDs with trapezoidal QWs exhibits a large advantage at lower current densities of below 2 kA/cm2. Full article
(This article belongs to the Special Issue Low Dimensional Luminescent Nanomaterials and Nanodevices)
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14 pages, 5255 KiB  
Article
Exciton Luminescence and Optical Properties of Nanocrystalline Cubic Y2O3 Films Prepared by Reactive Magnetron Sputtering
by Anatoly Zatsepin, Yulia Kuznetsova, Dmitry Zatsepin, Chi-Ho Wong, Wing-Cheung Law, Chak-Yin Tang and Nikolay Gavrilov
Nanomaterials 2022, 12(15), 2726; https://doi.org/10.3390/nano12152726 - 08 Aug 2022
Cited by 4 | Viewed by 1558
Abstract
This paper presents a comprehensive study of the energy structure, optical characteristics, and spectral-kinetic parameters of elementary excitations in a high-purity nanocrystalline cubic Y2O3 film synthesized by reactive magnetron sputtering. The optical transparency gaps for direct and indirect interband transitions [...] Read more.
This paper presents a comprehensive study of the energy structure, optical characteristics, and spectral-kinetic parameters of elementary excitations in a high-purity nanocrystalline cubic Y2O3 film synthesized by reactive magnetron sputtering. The optical transparency gaps for direct and indirect interband transitions were determined and discussed. The dispersion of the refractive index was established based on the analysis of interference effects. It was found that the refractive index of the Y2O3 film synthesized in this study is higher in order of magnitude than that of the films obtained with the help of other technologies. The intrinsic emission of Y2O3 film has been discussed and associated with the triplet–singlet radiative relaxation of self-trapped and bound excitons. We also studied the temperature behavior of the exciton luminescence of Y2O3 for the first time and determined thermal activation barriers. The optical energy and kinetic parameters of cubic Y2O3 films were analyzed in comparison with those of the monoclinic films of yttrium oxide. The main difference between the optical properties of cubic and monoclinic Y2O3 films was established, which allowed for a supposition of their application prospects. Full article
(This article belongs to the Special Issue Low Dimensional Luminescent Nanomaterials and Nanodevices)
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Review

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27 pages, 8462 KiB  
Review
Recent Research Progress of Mn4+-Doped A2MF6 (A = Li, Na, K, Cs, or Rb; M = Si, Ti, Ge, or Sn) Red Phosphors Based on a Core–Shell Structure
by Yueping Xie, Tian Tian, Chengling Mao, Zhenyun Wang, Jingjia Shi, Li Yang and Cencen Wang
Nanomaterials 2023, 13(3), 599; https://doi.org/10.3390/nano13030599 - 02 Feb 2023
Cited by 9 | Viewed by 2134
Abstract
White light emitting diodes (WLEDs) are widely used due to their advantages of high efficiency, low electricity consumption, long service life, quick response time, environmental protection, and so on. The addition of red phosphor is beneficial to further improve the quality of WLEDs. [...] Read more.
White light emitting diodes (WLEDs) are widely used due to their advantages of high efficiency, low electricity consumption, long service life, quick response time, environmental protection, and so on. The addition of red phosphor is beneficial to further improve the quality of WLEDs. The search for novel red phosphors has focused mainly on Eu2+ ion- and Mn4+ ion-doped compounds. Both of them have emissions in the red region, absorption in blue region, and similar quantum yields. Eu2+-doped phosphors possess a rather broad-band emission with a tail in the deep red spectral range, where the sensitivity of the human eye is significantly reduced, resulting in a decrease in luminous efficacy of WLEDs. Mn4+ ions provide a narrow emission band ~670 nm in oxide hosts, which is still almost unrecognizable to the human eye. Mn4+-doped fluoride phosphors have become one of the research hotspots in recent years due to their excellent fluorescent properties, thermal stability, and low cost. They possess broad absorption in the blue region, and a series of narrow red emission bands at around 630 nm, which are suitable to serve as red emitting components of WLEDs. However, the problem of easy hydrolysis in humid environments limits their application. Recent studies have shown that constructing a core–shell structure can effectively improve the water resistance of Mn4+-doped fluorides. This paper outlines the research progress of Mn4+-doped fluoride A2MF6 (A = Li, Na, K, Cs, or Rb; M = Si, Ti, Ge or Sn), which has been based on the core–shell structure in recent years. From the viewpoint of the core–shell structure, this paper mainly emphasizes the shell layer classification, synthesis methods, luminescent mechanism, the effect on luminescent properties, and water resistance, and it also gives some applications in terms of WLEDs. Moreover, it proposes challenges and developments in the future. Full article
(This article belongs to the Special Issue Low Dimensional Luminescent Nanomaterials and Nanodevices)
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