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Applied Sciences
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Recent Advances in Optoelectronics: Organic/Hybrid Materials and Devices
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Recent Advances in Optoelectronics: Organic/Hybrid Materials and Devices

A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Materials Science and Engineering".

Deadline for manuscript submissions: closed (30 November 2020) | Viewed by 8010

Special Issue Editors

Prof. Dr. Amerigo Beneduci

E-Mail Website
Guest Editor
Department of Chemistry and Chemical Technologies, University of Calabria, 87036 Arcavacata di Rende, CS, Italy
Interests: electrochromism; electrofluorochromism; liquid crystals; fluorescent materials; optoelectronic devices
Special Issues, Collections and Topics in MDPI journals
Dr. Giuseppina Anna Corrente

E-Mail Website
Co-Guest Editor
Department of Chemistry and Chemical Technologies, University of Calabria, 87036 Arcavacata di Rende, CS, Italy
Interests: chemistry of materials
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

This Special Issue is intended to serve as a forum of discussion on the recent progress in the field of materials and devices for optoelectronic applications. It will cover both the theoretical and experimental aspects of this multidisciplinary field of research that span from the design, synthesis, and characterization of novel organic and hybrid functional materials, to the design and performance characterization of devices at the forefront of chemistry, physics, and engineering. Even though real life applications of organic materials in different sectors are still premature, recent scientific progress in the field in terms of materials stability and device lifetime still indicates that they are highly promising for the development of robust technologies for energy harvesting, conversion and storage, energy saving, light switch, and electron and ion transport.

You are invited to contribute to this Special Issue with high-quality papers that represent a pivotal point in the aforementioned technological fields and that open the way to future challenges and insights for both the academic and industrial community.

Prof. Dr. Amerigo Beneduci
Dr. Giuseppina Anna Corrente
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. Applied Sciences 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

  • organic/hybrid functional materials
  • optoelectronic devices
  • electrochromism
  • electrofluorochromism
  • electrochemistry
  • light modulation
  • switching devices
  • light harvesting
  • energy conversion
  • energy storage
  • electron transport
  • ion transport

Published Papers (3 papers)

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Research

9 pages, 2659 KiB  
Article
Strong Photoluminescence Enhancement from Bilayer Molybdenum Disulfide via the Combination of UV Irradiation and Superacid Molecular Treatment
by Yuki Yamada, Takeshi Yoshimura, Atsushi Ashida, Norifumi Fujimura and Daisuke Kiriya
Appl. Sci. 2021, 11(8), 3530; https://doi.org/10.3390/app11083530 - 15 Apr 2021
Cited by 2 | Viewed by 2679
Abstract
A direct band gap nature in semiconducting materials makes them useful for optical devices due to the strong absorption of photons and their luminescence properties. Monolayer transition metal dichalcogenides (TMDCs) have received significant attention as direct band gap semiconductors and a platform for [...] Read more.
A direct band gap nature in semiconducting materials makes them useful for optical devices due to the strong absorption of photons and their luminescence properties. Monolayer transition metal dichalcogenides (TMDCs) have received significant attention as direct band gap semiconductors and a platform for optical applications and physics. However, bilayer or thicker layered samples exhibit an indirect band gap. Here, we propose a method that converts the indirect band gap nature of bilayer MoS2, one of the representative TMDCs, to a direct band gap nature and enhances the photoluminescence (PL) intensity of bilayer MoS2 dramatically. The procedure combines UV irradiation with superacid molecular treatment on bilayer MoS2. UV irradiation induces the conversion of the PL property with an indirect band gap to a direct band gap situation in bilayer MoS2 when the interaction between the top and bottom layers is weakened by a sort of misalignment between them. Furthermore, the additional post-superacid treatment dramatically enhances the PL intensity of bilayer MoS2 by a factor of 700×. However, this procedure is not effective for a conventional bilayer sample, which shows no PL enhancement. From these results, the separated top layer would show a strong PL from the superacid treatment. The monolayer-like top layer is physically separated from the substrate by the intermediate bottom MoS2 layer, and this situation would be preferable for achieving a strong PL intensity. This finding will be useful for controlling the optoelectronic properties of thick TMDCs and the demonstration of high-performance optoelectronic devices. Full article
(This article belongs to the Special Issue Recent Advances in Optoelectronics: Organic/Hybrid Materials and Devices)
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11 pages, 1792 KiB  
Article
Mixed-Valence Compounds as a New Route for Electrochromic Devices with High Coloration Efficiency in the Whole Vis-NIR Region
by Giuseppina Anna Corrente, Sante Cospito, Agostina Lina Capodilupo and Amerigo Beneduci
Appl. Sci. 2020, 10(23), 8372; https://doi.org/10.3390/app10238372 - 25 Nov 2020
Cited by 13 | Viewed by 2160
Abstract
Electrochromic devices (ECDs) that allow the modulation of light transmission are very attractive in the research field of energy saving. Here all-in-one gel switchable ECDs based on mixed-valence electroactive compounds were developed. The use of the thienoviologen/ferrocene couple as cathode and anode, respectively, [...] Read more.
Electrochromic devices (ECDs) that allow the modulation of light transmission are very attractive in the research field of energy saving. Here all-in-one gel switchable ECDs based on mixed-valence electroactive compounds were developed. The use of the thienoviologen/ferrocene couple as cathode and anode, respectively, leads to a significant electrochromic band in the visible range (550–800 nm), with a color change from yellow to green, and to a lower band in the NIR region (1000–1700 nm), due to the presence of one electroactive-chromic species. Replacement of the electroactive ferrocene with a fluorene-diarylamine electroactive-chromic species, allows to extend and intensify the absorption in the NIR region, thus affording modulation of the solar radiation from 500 up to 2200 nm. High optical contrast, fast coloration and bleaching times and outstanding coloration efficiencies were measured for all observed absorption bands upon the application of small potential differences (1.4 V < DV < 2 V). Full article
(This article belongs to the Special Issue Recent Advances in Optoelectronics: Organic/Hybrid Materials and Devices)
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10 pages, 2061 KiB  
Article
TD-DFT Prediction of the Intermolecular Charge-Transfer UV-Vis Spectra of Viologen Salts in Solution
by Giacomo Saielli
Appl. Sci. 2020, 10(22), 8108; https://doi.org/10.3390/app10228108 - 16 Nov 2020
Cited by 4 | Viewed by 2388
Abstract
The absorption spectrum of viologen salts in a medium or low polar solvent is an essential feature that influences all its “chromic” applications, whether we are considering thermochromic, electrochromic, photochromic or chemochromic devices. The prediction by quantum chemical methods of such absorption bands, [...] Read more.
The absorption spectrum of viologen salts in a medium or low polar solvent is an essential feature that influences all its “chromic” applications, whether we are considering thermochromic, electrochromic, photochromic or chemochromic devices. The prediction by quantum chemical methods of such absorption bands, typically observed in the visible range and due to charge transfer (CT) phenomena, is a very challenging problem due to strong solvent effects influencing both the geometry and the electronic transitions. Here we present a computational protocol based on DFT to predict with very high accuracy the absorption maxima of the CT bands of a series of viologen salts in solvents of low and medium polarity. The calculations also allow a clear dissection of the solvent effects, direct and indirect, and orbital contributions to the CT band. Full article
(This article belongs to the Special Issue Recent Advances in Optoelectronics: Organic/Hybrid Materials and Devices)
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