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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: closed (20 June 2024) | Viewed by 6297

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

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Keywords

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

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Published Papers (4 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 2374
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

15 pages, 5879 KiB  
Article
Excellent Color Purity and Luminescence Thermometry Performance in Germanate Tellurite Glass Doped with Eu3+ and Tb3+
by Bartosz Bondzior and Radosław Lisiecki
Appl. Sci. 2024, 14(10), 4198; https://doi.org/10.3390/app14104198 - 15 May 2024
Cited by 2 | Viewed by 1030
Abstract
Germanate tellurite glasses doped with Eu3+ and Tb3+ were synthesized by the conventional melt-quenching method. There is no indication of the energy transfer between dopant ions in this host, but the co-dopants exhibit excellent color purity of 100% for Eu3+ [...] Read more.
Germanate tellurite glasses doped with Eu3+ and Tb3+ were synthesized by the conventional melt-quenching method. There is no indication of the energy transfer between dopant ions in this host, but the co-dopants exhibit excellent color purity of 100% for Eu3+ and 80% for Tb3+. The co-doped glass exhibits yellow luminescence. The quantum yield of the Eu3+ emission is equal to 23% under 395 nm excitation. The thermal quenching of Eu3+ and Tb3+ luminescence occurs at different temperature ranges, which enables the thermal sensing properties of the material. The relative fluorescence intensity ratio (FIR) sensitivity of 0.16% K−1 was recorded in the wide range of temperatures spanning from −193 °C up to 0 °C. The temperature dependence of the decay times was also studied. The lifetime-based temperature sensitivity was determined to be 0.95% K−1 at 250 °C for Tb3+5D3 level emission and 0.3% K−1 at 225 °C for Eu3+5D1 level emission. Full article
(This article belongs to the Special Issue Luminescent Materials: Synthesis, Characterization and Applications)
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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 1049
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 - 8 Jan 2024
Cited by 1 | Viewed by 1271
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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