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Applied Sciences
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Luminescent Materials: Synthesis, Characterization and Applications
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Luminescent Materials: Synthesis, Characterization and Applications

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

Deadline for manuscript submissions: 20 June 2024 | Viewed by 2751

Special Issue Editor

Dr. Joana Rodrigues

E-Mail Website
Guest Editor
i3N & Department of Physics, University of Aveiro, 3810-193 Aveiro, Portugal
Interests: photoluminescence; persistent luminescence; nanomaterials; wide bandgap semiconductors; sensing; photocatalysis
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Luminescent materials have found their way into our daily lives and can be found in virtually all applications, from screens and displays, LEDs that illuminate our homes, traffic lights and phosphorescent road signs, as well as medical imaging and optical sensors. Despite the significant progress achieved in recent decades, the ever-growing demand for advanced luminescent materials poses countless challenges and opens numerous opportunities for the further development and materialization of applications. Indeed, luminescent materials encompass a fascinating topic both from a research point of view and to address societal demands, as attested by their increasing exploitation in fields such as water remediation, photocatalysis, disinfection, biosensing, thermometry, phototherapy, horticulture and so on. Advances in modern chemistry and material science have contributed immensely to the development of these materials, providing new ways of tailoring properties such as composition, size, morphology, or surface chemistry, towards the desired luminescent characteristics and target applications. Likewise, the interest in a better understanding of intriguing phenomena such as persistent luminescence or up-conversion processes has also motivated further research on these materials, making it a trending topic in the scientific community.

This Special Issue welcomes original and review papers focused on the synthesis, characterization and applications of luminescent materials, aiming to contribute with a timely overview of the advances in their synthesis/preparation, the fundamental understanding of their properties, and the current and emerging areas where they are being applied.

Dr. Joana Rodrigues
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. 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

  • luminescence
  • persistent luminescence
  • down- and up-conversion
  • phosphors
  • imaging
  • photocatalysis
  • sensing
  • thermometry
  • phototherapy

Published Papers (3 papers)

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Editorial

Jump to: Research

3 pages, 198 KiB  
Editorial
Luminescent Materials: Synthesis, Characterization and Applications
by Joana Rodrigues
Appl. Sci. 2023, 13(15), 8705; https://doi.org/10.3390/app13158705 - 28 Jul 2023
Viewed by 1230
Abstract
Luminescent materials are capable of transforming certain types of energy into electromagnetic radiation, which means that in response to a specific stimulus, these materials emit light typically within the ultraviolet (UV) to the infrared (IR) spectral region [...] Full article
(This article belongs to the Special Issue Luminescent Materials: Synthesis, Characterization and Applications)

Research

Jump to: Editorial

11 pages, 5367 KiB  
Article
Pr3+-Doped Lithium Niobate and Sodium Niobate with Persistent Luminescence and Mechano-Luminescence Properties
by Yang Hua, Zhenfeng Jing and Pinghui Ge
Appl. Sci. 2024, 14(7), 2947; https://doi.org/10.3390/app14072947 - 31 Mar 2024
Viewed by 434
Abstract
In this research, a comprehensive series of Pr3+-doped lithium niobate and sodium niobate materials were obtained at different temperatures via solid-state sintering, and their structures and properties were compared. NaNbO3: 0.75% Pr3+ phosphors were synthesized by sintering at [...] Read more.
In this research, a comprehensive series of Pr3+-doped lithium niobate and sodium niobate materials were obtained at different temperatures via solid-state sintering, and their structures and properties were compared. NaNbO3: 0.75% Pr3+ phosphors were synthesized by sintering at 1150 °C for 2 h and emitted red persistent luminescence for more than 1200 s, peaking at 612 nm under UV excitation, which was a typical long persistent luminescence phenomenon. Furthermore, the sample glowed when pressurized, and a red bright luminescence which lasted for several seconds was visible to the naked eye. This was a typical mechanical luminescence phenomenon of samples under mechanical stress, directly converting mechanical energy into light energy. It was determined that NaNbO3:Pr3+ and LiNbO3:Pr3+ both possess multimode luminescence. Owing to their red long persistent luminescence (LPL) and mechano-luminescence (ML) properties, Pr3+ phosphors can be employed in fields, such as display technologies, stress sensing, structural damage detection, and other complex applications. Full article
(This article belongs to the Special Issue Luminescent Materials: Synthesis, Characterization and Applications)
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14 pages, 3378 KiB  
Article
Red-Emitting Cr3+ on α-Al2O3:Cr Spheres Obtained in Seconds Using Laser Processing
by Joana Rodrigues, Alexandre Faia Carvalho, Julia Zanoni, António J. S. Fernandes, Florinda M. Costa and Teresa Monteiro
Appl. Sci. 2024, 14(2), 528; https://doi.org/10.3390/app14020528 - 08 Jan 2024
Viewed by 680
Abstract
Cr-doped Al2O3 spheres with strong red emission were produced using a simple laser processing approach with a 50 W continuous CO2 laser. Structural characterization revealed that the produced spheres were monophasic, comprising the α-Al2O3 phase. Photoluminescence [...] Read more.
Cr-doped Al2O3 spheres with strong red emission were produced using a simple laser processing approach with a 50 W continuous CO2 laser. Structural characterization revealed that the produced spheres were monophasic, comprising the α-Al2O3 phase. Photoluminescence (PL) studies indicated that the observed red emission originates from multiple Cr3+ optical centers being dominated by the 2E → 4A2 transition (R-lines), with a further contribution from the parity and spin forbidden 2T1 → 4A2 transition (R′-lines). The identification of additional radiative recombination from chromium ion pairs (N-lines) evidences that the produced samples are heavily doped. As such, energy transfer processes between the different chromium optical centers are seen to take place, as suggested by the lifetime decay analysis. PL excitation revealed that the room temperature luminescence is preferentially populated via the spin-allowed 4A2 → 4T2,4T1 transitions and by the parity and spin-forbidden 4A2 → 2T2 (B-lines), 2T1 (R′-lines), 2E (R-lines). Such results demonstrate that the present synthesis method is able to deliver high-optical-quality Al2O3:Cr crystals in a fast and simple way, with potential interest for optical, sensing, or lasing applications. Full article
(This article belongs to the Special Issue Luminescent Materials: Synthesis, Characterization and Applications)
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