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Coatings
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Optical Coatings: From Materials to Applications
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Optical Coatings: From Materials to Applications

A special issue of Coatings (ISSN 2079-6412). This special issue belongs to the section "Thin Films".

Deadline for manuscript submissions: 30 June 2024 | Viewed by 2444

Special Issue Editor

Prof. Dr. Ihor S. Virt

E-Mail Website
Guest Editor
Department of Physics, Drohobych Ivan Franko State Pedagogical University, Ivan Franko 24, 82100 Drohobych, Ukraine
Interests: condensed phase physics; optoelectronic; thin-film technologies; thin-film materials; epitaxial thin films; pulsed laser deposition; photocurrent spectroscopy; low-frequency noise spectroscopy; photovoltaic and thermoelectric structures
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

This section is interested in the use of thin films in various fields of science and technology, such as the production of electronic, photonic and optoelectronic devices and their integration into various types of devices. The thin-film materials discussed in this section include semiconductors, transparent conducting oxides (TCO), organic and amorphous semiconductors, nanostructured materials, and various other products. The deposition processes of various optical materials with characteristics such as high sensitivity, robust structure, and clear recognition are interesting in terms of their capacity to improve the performance of fiber-optic sensors. Antireflective coatings (ARC) are required for various optical components.

Equally, it is important to develop layers with a high refractive index and with high reflectivity for broadband applications, such as TiO2, ZrO2, Nb2O5, Ta2O5 and others. High-efficiency thin-film materials can be used for photovoltaic applications and in industrial devices.

Thin-film materials can be used more broadly as photodetectors, infrared and quantum infrared photodetectors, semiconductor and quantum cascade lasers, photovoltaic cells, and integrated circuits. Other uses include their roles as semiconductor devices, wireless devices, telecommunications, integrated circuits, and computer chips.  

This section welcomes the submission of articles on topics that include:

  • Scientific aspects of methods of deposition and processing of thin films. Growth and crystallization of thin films, atomic layer crystallization, nucleation and processes during the growth and heat treatment of thin films. Formation of crystal structure during growth of films, epitaxial thin films, and expectations versus real structure of monocrystalline films. In situ growth and classification of cluster morphologists: study of growth of composite thin films.
  • Thin-film and coating technologies, including physical vapor deposition (PVD), magnetron sputtering (MS), sol–gel technology (SLGL), pulsed laser deposition methods (PLD), plasma/ion beam deposition (PIBD), chemical vapor deposition (CVD).
  • Diagnosis of the characteristics of thin films—using optical, electrical, thermal, spectroscopic, mechanical, X-ray and electron microscopic methods. Low-energy electron diffraction spectroscopy and photoelectron spectroscopy of ultrathin films.

In particular, the topics of interest include, but are not limited to:

  • Technologies and mechanisms of growth of thin films;
  • Wide-bandgap, narrow-bandgap semiconductor and metal thin films;
  • Thin-film structures for fiber-optic elements, optoelectronic and photovoltaic devices;
  • Thin-film coatings for biomedicine and bioelectronics devices;
  • Thin films for lenses, mirrors and other optical elements.

Prof. Dr. Ihor S. Virt
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. Coatings is an international peer-reviewed open access monthly 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 2600 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

  • coatings technologies
  • thin-film structures
  • optical constants
  • optoelectronics
  • photovoltaic devices
  • fiber-optic elements
  • antireflection coatings
  • transparent conducting oxides

Published Papers (3 papers)

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Research

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14 pages, 5304 KiB  
Article
Natural Light Rechargeable Night Peal-like Coatings for Expressway
by Xin Li, Rong Chen, Rui Xiao, Wenjie Li, Te Si, Peiyang Li and Qi Zhu
Coatings 2024, 14(5), 566; https://doi.org/10.3390/coatings14050566 - 02 May 2024
Viewed by 136
Abstract
Traditional roadway lighting is intended to provide safe guidance for drivers and pedestrians, but the large-scale application of roadway lighting has resulted in significant energy consumption and light pollution. However, road markings prepared by luminous coating are a kind of multi-functional road marking [...] Read more.
Traditional roadway lighting is intended to provide safe guidance for drivers and pedestrians, but the large-scale application of roadway lighting has resulted in significant energy consumption and light pollution. However, road markings prepared by luminous coating are a kind of multi-functional road marking that can meet the needs of highway lighting at night and save energy. Here, CaAl2O4:Eu2+,Nd3+,Gd3+ blue long-afterglow phosphor is obtained by the high-temperature solid-state method, and the blue luminescent coating is synthesized by the blending method. The phase composition, microscopic morphology, luminescence properties and water resistance of the phosphor and luminescent coatings are characterized. The best components and processes of the luminescent coating are explored to meet the application of an expressway. Considering the afterglow’s performance, the optimal calcination temperature of the phosphor is determined to be 1300 °C. The afterglow of the phosphor can be over 8 h after 2 h of daylight excitation. The addition of 1.25% SiO2 to the luminescent coating improves the uniformity of the components, and the incorporation of 3.5% CaCO3 improves the denseness of the coating. When the coating thickness is 0.8mm, the luminescent coating can achieve the best luminous effect. After 120 h of immersion in water, the afterglow intensity of the luminescent coating reduced to 70% of the original, which has excellent water resistance. The blue luminescent coating with the addition of appropriate amounts of CaCO3 and SiO2 improves the dispersion as well as the densification of the components in the coating to achieve the best luminescent effect. In the Shenyang area, different weather conditions (cloudy, sunny, rainy) have no significant effect on the afterglow performance of the luminescent coatings, all of which can achieve over 5 h of afterglow and are suitable for expressways. Full article
(This article belongs to the Special Issue Optical Coatings: From Materials to Applications)
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12 pages, 5797 KiB  
Article
Coating Red Phosphor on Green Luminescent Material for Multi-Mode Luminescence and Advanced Anti-Counterfeit Applications
by Jiale Liu, Bo Chen and Qi Zhu
Coatings 2024, 14(4), 509; https://doi.org/10.3390/coatings14040509 - 19 Apr 2024
Viewed by 375
Abstract
Traditional fluorescent anti-counterfeiting materials usually exhibit fixed-wavelength excitation patterns and monochromatic luminescence, which are extremely easy to be counterfeited and have low security. Therefore, there is an urgent need to develop multi-mode fluorescent materials with enhanced security to address this issue. Here, SrAl [...] Read more.
Traditional fluorescent anti-counterfeiting materials usually exhibit fixed-wavelength excitation patterns and monochromatic luminescence, which are extremely easy to be counterfeited and have low security. Therefore, there is an urgent need to develop multi-mode fluorescent materials with enhanced security to address this issue. Here, SrAl2O4:1%Eu,2%Dy@Y2O3:Eu3+ core-shell structured phosphors were prepared via a sol-gel method. Coating SrAl2O4:Eu,Dy with Y2O3:Eu3+ red phosphor did not significantly change the crystal structure of SrAl2O4. Under UV excitation at 254 nm, SrAl2O4:1%Eu,2%Dy@Y2O3:Eu3+ exhibited red emission at 613 nm (5D0→7F2 transition of Eu3+), and a strong green afterglow was observed after removing the UV irradiation. However, blue-green emission at 496 nm was observed under UV excitation at 365 nm, followed by green afterglow upon removal of the light source. Varying the content of the Y2O3:Eu3+ shell yielded different emissions and afterglows. The prepared samples are sensitive to the excitation wavelength and duration and have multimodal luminescence properties, which can be used for anti-counterfeiting patterns. The outcomes in this work indicate that the phosphor is a promising fluorescent material for anti-counterfeiting. Full article
(This article belongs to the Special Issue Optical Coatings: From Materials to Applications)
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Review

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25 pages, 5212 KiB  
Review
Application of Optical Fiber Sensing Technology and Coating Technology in Blood Component Detection and Monitoring
by Wenwen Qu, Yanxia Chen, Chaoqun Ma, Donghong Peng, Xuanyao Bai, Jiaxin Zhao, Shuangqiang Liu and Le Luo
Coatings 2024, 14(2), 173; https://doi.org/10.3390/coatings14020173 - 30 Jan 2024
Cited by 1 | Viewed by 1451
Abstract
The advantages of optical fiber sensors include their miniaturization, strong anti-interference ability, high sensitivity, low cost, and fast response speed. They can be used for in situ detection in harsh environments, making them suitable for a wide range of applications such as blood [...] Read more.
The advantages of optical fiber sensors include their miniaturization, strong anti-interference ability, high sensitivity, low cost, and fast response speed. They can be used for in situ detection in harsh environments, making them suitable for a wide range of applications such as blood detection and monitoring. This technology holds great potential for medical diagnosis and health monitoring, opening up new possibilities in the field. Coating technology plays a crucial role in enhancing the sensitivity and stability of optical fiber sensors, ultimately improving their measurement accuracy and reliability. This manuscript expounds the application status and progression of optical fiber sensors in the determination of blood glucose concentrations, blood pH, diverse proteins in blood, and physical properties of blood. The principle of optical fiber sensors and the application of coating technology for detecting varying targets are scrutinized in detail, with particular emphasis on the advantages and limitations of distinct design schemes. The adept amalgamation of optical fiber sensing technology and coating technology amplifies the adaptability of optical fiber sensors in diverse practical scenarios, thereby presenting novel instruments and methodologies for researchers in pertinent fields to augment their advancement and development. Full article
(This article belongs to the Special Issue Optical Coatings: From Materials to Applications)
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