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Advanced Materials for Optical Applications and Devices
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Advanced Materials for Optical Applications and Devices

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Optical and Photonic Materials".

Deadline for manuscript submissions: closed (20 July 2022) | Viewed by 16176

Special Issue Editor

Dr. Hélène Serier-Brault

E-Mail Website
Guest Editor
Universite de Nantes, Nantes, France
Interests: coordination polymers; metal–organic frameworks; lanthanide cations; luminescent materials; luminescence thermometry

Special Issue Information

Dear Colleagues,

This Special Issue “Advanced Materials for Optical Applications and Devices” provides an overview of the latest research and development in optical materials and devices.

Optical materials are inorganic, organic, or hybrid materials substances used to manipulate the flow of light for various applications such as pigments, phosphors, thermochromic materials, laser, photovoltaic devices, thermometry, chemical sensing, up-conversion, etc. All of these applications require a full understanding of the interaction between light and matter in order to develop original and relevant properties and increase our research knowledge.

The Special Issue “Advanced Materials for Optical Applications and devices” will be devoted to research on new relevant optical materials: from synthesis, structure, and properties to their potential optical applications. Consequently, original research papers, communications, or review articles in these areas are cordially invited.

Dr. Hélène Serier-Brault
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. Materials 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 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

  • inorganic materials
  • organic–inorganic hybrid materials
  • optical properties
  • luminescence
  • phosphorescence
  • photochromism
  • photovoltaics
  • thermochromism
  • optoelectronics
  • plasmonics

Published Papers (7 papers)

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Research

17 pages, 7574 KiB  
Article
Development of a Three-Dimensional Optical Verification Technology without Environmental Pollution for Metal Components with Different Surface Properties
by Chil-Chyuan Kuo, Zong-Yan He and Chil-Xian Lee
Materials 2022, 15(17), 6139; https://0-doi-org.brum.beds.ac.uk/10.3390/ma15176139 - 04 Sep 2022
Viewed by 1184
Abstract
Nowadays, the optical measuring approach is widely used in the precision machining industry due to high measurement efficiency. In the industry, measuring devices play a crucial role in the field of quality assurance. In practical engineering, the green measurement approach indeed plays an [...] Read more.
Nowadays, the optical measuring approach is widely used in the precision machining industry due to high measurement efficiency. In the industry, measuring devices play a crucial role in the field of quality assurance. In practical engineering, the green measurement approach indeed plays an important role in the industry currently. In this study, a state-of-the-art green technique for three-dimensional (3D) optical measurements without environmental pollution is demonstrated, which is an environmentally friendly optical measurement method. This method can perform precise optical measurement without matte coatings. This work dealt with the possibility of measuring four metal components that were not sprayed with anything. The differences in the optical measurement results between with and without matte coatings were investigated and analyzed. It was found that the research result has practical value in the precision machining industry because average size errors of the four measurement objects with different surface properties can be controlled at about 3 µm, 0.1 µm, 0.5 µm, and 9 µm. A technical database with industrial value was established for optical measurements of metal components with different surface properties without matte coatings, which can serve as an alternative to the conventional 3D optical measurement. Full article
(This article belongs to the Special Issue Advanced Materials for Optical Applications and Devices)
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12 pages, 3152 KiB  
Article
Sunlike White Light-Emitting Diodes Based on Rare-Earth-Free Luminescent Materials
by Amador Menéndez-Velázquez, Dolores Morales and Ana Belén García-Delgado
Materials 2022, 15(5), 1680; https://0-doi-org.brum.beds.ac.uk/10.3390/ma15051680 - 23 Feb 2022
Cited by 10 | Viewed by 1989
Abstract
Solid-state lighting (SSL) sources based on light-emitting diodes represent the new generation of highly efficient illumination systems that significantly impact energy-saving. The development of white light-emitting diodes (WLEDs) with a combination of high color rendering index (CRI) and high deep-red color rendering R [...] Read more.
Solid-state lighting (SSL) sources based on light-emitting diodes represent the new generation of highly efficient illumination systems that significantly impact energy-saving. The development of white light-emitting diodes (WLEDs) with a combination of high color rendering index (CRI) and high deep-red color rendering R9 is an important challenge in the field of solid-state lighting. On the other hand, most WLEDs use rare-earth inorganic luminescent materials. The annual demand for rare-earth metals has doubled to 125,000 tons in 15 years, and the demand is projected to reach 315,000 tons in 2030. The explosion in demand for these materials, combined with a monopolistic supply source, represents a real risk for the development of WLEDs in the next few years. Luminescent organic materials are a relevant and promising alternative. Here, we report a WLED with a very high CRI of 95.7 and R9 of 78.7, obtained using a combination of a blue LED chip (excitation source) and two organic luminescent dyes (Coumarin 6 and Lumogen Red) acting as spectral converters in a multilayer remote phosphor configuration. To the best of our knowledge, this is the first rare-earth-free WLED with such high values of CRI and R9. Full article
(This article belongs to the Special Issue Advanced Materials for Optical Applications and Devices)
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18 pages, 3373 KiB  
Article
Structural and Optical Characterizations of Cadmium Chalcogenide Layers on Polyamide Formed Using Monotelluropentathionic Acid
by Remigijus Ivanauskas, Linas Samardokas, Judita Sukyte, Skirma Zalenkiene and Ingrida Ancutiene
Materials 2022, 15(3), 787; https://0-doi-org.brum.beds.ac.uk/10.3390/ma15030787 - 20 Jan 2022
Viewed by 1449
Abstract
Mixed cadmium tellurides–cadmium sulfide thin layers were formed on the polyamide PA 6. Monotelluropentathionic acid (H2TeS4O6) was used as a precursor of tellurium and sulfur. A low-temperature, nontoxic, and cost-effective SILAR method was applied. Cadmium telluride (CdTe) [...] Read more.
Mixed cadmium tellurides–cadmium sulfide thin layers were formed on the polyamide PA 6. Monotelluropentathionic acid (H2TeS4O6) was used as a precursor of tellurium and sulfur. A low-temperature, nontoxic, and cost-effective SILAR method was applied. Cadmium telluride (CdTe) and sulfide (CdS) layers were formed through the consecutive reactions of sorbed/diffused chalcogens species from telluropentathionate anion (TeS4O62−) with functional groups of polyamide and alkaline cadmium sulfate. The pseudo-second-order rate and Elovich kinetic models were the best fit to quantify an uptake of chalcogens and cadmium on PA 6. The effects of chalcogens and Cd on the structure and optical properties of PA 6 were characterized using UV-Vis and IR spectra. The clear changes of these properties depended on the concentration and exposure time in the precursor solutions. Fourier transform infrared spectroscopy and ultraviolet-visible spectroscopy were applied in order to evaluate the effect of the chalcogen species on the changes in structure of polyamide 6 films, depending on the exposure time in the solution of the chalcogens precursor and its concentration. The optical bandgap energy of the formed layers was found to be in the order of 1.52–2.36 eV. Studies by scanning electron microscopy and atomic force microscopy reveal that the diameter of the average grain is approximately 30 nm. The grains are conical in shape and unevenly distributed all over the surface of the substrate. Full article
(This article belongs to the Special Issue Advanced Materials for Optical Applications and Devices)
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15 pages, 2051 KiB  
Article
Advanced Photonic Thin Films for Solar Irradiation Tuneability Oriented to Greenhouse Applications
by M. Barragán Sánchez-Lanuza, Amador Menéndez-Velázquez, Antonio Peñas-Sanjuan, Francisco J. Navas-Martos, Isidoro Lillo-Bravo and José-María Delgado-Sánchez
Materials 2021, 14(9), 2357; https://0-doi-org.brum.beds.ac.uk/10.3390/ma14092357 - 01 May 2021
Cited by 20 | Viewed by 2954
Abstract
The world population is growing by 1 billion people every 10 years. There will come a time when there will be more people to feed but less land to grow food. Greenhouses can be the solution to this problem because they provide the [...] Read more.
The world population is growing by 1 billion people every 10 years. There will come a time when there will be more people to feed but less land to grow food. Greenhouses can be the solution to this problem because they provide the highest production yield per m2 and also use less water, provide food safety, and offer high quality. Photosynthetic active radiation (PAR) favors vegetable growth with a specific blue and red light ratio. Thus, increasing the amount of red light improves chlorophyll absorption and photosynthetic efficiency. In this article, we present a hybrid system that combines luminescent materials and photonic crystals for better management of the light reaching the greenhouse. The luminescent dyes considered herein are combined ensuring a Förster resonance energy transfer (FRET) nonradiative mechanism to enhance the absorption range. The designed photonic crystal maximizes reflections in the Near-Infrared (NIR) range, and therefore, thermal losses are minimized. Thus, by converting harmful or ineffective radiation for plant growth to the PAR region, we aim to demonstrate growth-condition enhancement for the different vegetables that have been used as a model. Full article
(This article belongs to the Special Issue Advanced Materials for Optical Applications and Devices)
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9 pages, 2206 KiB  
Article
Polarization-Selective Bidirectional Absorption Based on a Bilayer Plasmonic Metasurface
by Tong Li, Bin-Quan Chen, Qian He, Li-An Bian, Xiong-Jun Shang and Guo-Feng Song
Materials 2020, 13(22), 5298; https://0-doi-org.brum.beds.ac.uk/10.3390/ma13225298 - 23 Nov 2020
Cited by 5 | Viewed by 2138
Abstract
We propose an alignment-free and polarization-selective bidirectional absorber composed of a one-dimensional bilayer Au grating array buried in a silicon nitride spacer. The absorptivity of the designed structure is more than 95% (77%) under normal forward (backward) TM-polarized light incidence, and is more [...] Read more.
We propose an alignment-free and polarization-selective bidirectional absorber composed of a one-dimensional bilayer Au grating array buried in a silicon nitride spacer. The absorptivity of the designed structure is more than 95% (77%) under normal forward (backward) TM-polarized light incidence, and is more than 80% (70%) within a forward (backward) incident angle up to 30°. The great bidirectional absorption performance is illustrated by the resonance coupling of the surface plasmon polaritons (SPPs) resonance, the propagating surface plasmon (PSP) resonance and the localized surface plasmon (LSP) resonance under TM-polarized wave illumination. Moreover, the excitation of the Fano-like resonance mode of the proposed metasurface can produce two significantly different peaks in the absorption spectrum under the oblique TM-polarized incidence, which is beneficial for the plasmon-sensing application. Therefore, the proposed bidirectional metasurface absorber can be a candidate in the application of optical camouflage, thermal radiation, solar cells and optical sensing. Full article
(This article belongs to the Special Issue Advanced Materials for Optical Applications and Devices)
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12 pages, 3223 KiB  
Article
Structure and Photoluminescence Properties of Rare-Earth (Dy3+, Tb3+, Sm3+)-Doped BaWO4 Phosphors Synthesized via Co-Precipitation for Anti-Counterfeiting
by Jae-yong Jung, Juna Kim, Young-Seok Shim, Donghyun Hwang and Chang Sik Son
Materials 2020, 13(18), 4165; https://0-doi-org.brum.beds.ac.uk/10.3390/ma13184165 - 19 Sep 2020
Cited by 31 | Viewed by 3177
Abstract
Barium tungstate (BaWO4) powders with various sintering temperatures, and BaWO4:Dy3+ phosphor samples with concentrations of different rare-earth (RE) activator ions (Dy3+, Sm3+, Tb3+) were prepared through co-precipitation. The structural, morphological, and photoluminescent [...] Read more.
Barium tungstate (BaWO4) powders with various sintering temperatures, and BaWO4:Dy3+ phosphor samples with concentrations of different rare-earth (RE) activator ions (Dy3+, Sm3+, Tb3+) were prepared through co-precipitation. The structural, morphological, and photoluminescent characteristics of barium tungstate phosphors depend on the concentration of RE ions. The crystallographic characteristics of the synthesized BaWO4 were analyzed using X-ray diffraction (XRD) patterns. The size and shape of the crystalline particles were estimated based on images measured with a field emission scanning electron microscope (FE-SEM). As the sintering temperature of the BaWO4 particles increased from 400 °C to 1000 °C, the size of the particles gradually increased and showed a tendency to clump together. In the sample doped with 7 mol % Dy3+ ions, the intensity of all emission bands reached their maximum. The emission spectra of the RE3+-doped BaWO4 powders by excitation at 325 nm were composed of yellow (Dy3+), red (Sm3+), and green (Tb3+) band at 572, 640, and 544 nm. This indicates that most of the RE3+ ions absorbed the position without reversal symmetry in the BaWO4 lattice. These results propose that strong emission intensity and tunable color for the phosphors can be accomplished by rare-earth doped host with an suitable quantity. In addition, the phosphor thin films, having high transparency from aqueous colloidal solutions, were deposited on banknotes, and it is considered whether it is suitable for anti-counterfeiting applications. Full article
(This article belongs to the Special Issue Advanced Materials for Optical Applications and Devices)
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10 pages, 2930 KiB  
Article
Surface Plasmon Enhancement of Eu3+ Emission Intensity in LaPO4/Ag Nanoparticles
by Sanja Kuzman, Jovana Periša, Vesna Đorđević, Ivana Zeković, Ivana Vukoje, Željka Antić and Miroslav D. Dramićanin
Materials 2020, 13(14), 3071; https://0-doi-org.brum.beds.ac.uk/10.3390/ma13143071 - 10 Jul 2020
Cited by 5 | Viewed by 2272
Abstract
A promising way to improve the performance of luminescent materials is to combine them with noble metal nanoparticles. Herein, a set of silver/europium-doped lanthanum orthophosphate (Ag/La0.95Eu0.05PO4) nanostructures with different concentrations of silver nanoparticles were prepared and investigated. [...] Read more.
A promising way to improve the performance of luminescent materials is to combine them with noble metal nanoparticles. Herein, a set of silver/europium-doped lanthanum orthophosphate (Ag/La0.95Eu0.05PO4) nanostructures with different concentrations of silver nanoparticles were prepared and investigated. The presented overlap between the strongest europium (Eu3+) excitation line and the broad silver nanoparticle surface plasmon resonance makes the combination prospective for coupling. X-ray powder diffraction confirmed the monoclinic monazite structure. The transmission electron microscopy revealed particles with a rod-like shape and ~4 aspect ratio. Photoluminescence spectra show characteristic Eu3+ ion red emission. One of the requirements for an enhanced luminescence effect is the precise control of the distance between the noble metal nanoparticles and the emitter ion. The distance is indirectly varied throughout the change of Ag nanoparticle concentration in the La0.95Eu0.05PO4 host. The emission intensity increases with the increase in Ag nanoparticles up to 0.6 mol %, after which the luminescence decreases due to the nanoparticles’ close packing and aggregation leading to the displacement of La0.95Eu0.05PO4 from the vicinity of the metal particles and reabsorption of the emitted light. The emission intensity of La0.95Eu0.05PO4 increases more than three times when the Eu3+ excitation is supported by the localized surface plasmon resonance in the Ag/La0.95Eu0.05PO4 nanostructures. Full article
(This article belongs to the Special Issue Advanced Materials for Optical Applications and Devices)
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