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Abstract title: The Sol-Gel Synthesis and Characterization of Novel K-doped YAG:Tb Garnet-Type Luminescent Materials
Submitting author: Diana Vištorskaja
Affiliation: Institute of Chemistry, Faculty of Chemistry and Geosciences, Vilnius University
Affiliation Address: Naugarduko st. 24, LT-03225 Vilnius, Lithuania
Country: Lithuania
Other authors and affiliations: Artūras Katelnikovas (Institute of Chemistry, Faculty of Chemistry and Geosciences, Vilnius University, Naugarduko st. 24, LT-03225 Vilnius, Lithuania), Gintautas Tamulaitis (Institute of Photonics and Nanotechnology, Faculty of Physics, Vilnius University, Sauletekis av. 3, LT-10257 Vilnius, Lithuania), Aivaras Kareiva (Institute of Chemistry, Faculty of Chemistry and Geosciences, Vilnius University, Naugarduko st. 24, LT-03225 Vilnius, Lithuania)
Abstract
In the modern digital age, the demand for energy is constantly increasing, which can lead to various environmental changes. One possible cause of this problem is the inefficiency of devices that consume large amounts of energy while yielding low output. It is also crucial to ensure that lighting technologies are environmentally friendly. A potential solution to this problem is the development of new eco-friendly lighting technologies and efficient multifunctional materials [1]. Scientists are paying particular attention to inorganic luminescent materials (phosphors), which are practically used in almost all artificial lighting devices. Phosphors consist of a crystalline host (matrix) and an activator, usually lanthanide or transition metal ions [2]. Garnet-type compounds are among the most widely used optical host materials. Yttrium aluminum garnet (Y₃Al₅O₁₂, YAG) stands out due to its high optical transparency in the range of ultraviolet to infrared, as well as its excellent thermal and chemical stability. Because of its unique properties, YAG doped with transition metal or lanthanide ions finds broad applications in fluorescence and is considered a key component in all colours phosphors [2, 3]. It is well known that the optical properties of luminescent materials are influenced by both the doping ions and their concentrations, as well as the crystal structure and chemical composition of the phosphor host material. In this study, the YAG matrix was modified by substituting yttrium with potassium and terbium. The sol-gel synthesis method was chosen for sample preparation because it is environmentally friendly, does not require high temperatures or pressure, and enables the fabrication of products with high phase purity [3]. Therefore, the main objective of this work is to synthesize novel garnet-type Y2.97-xKxTb0.03Al5O12 luminescent materials and investigate their structural and morphological features, as well as to study their optical properties. The obtained products were characterized by using XRD, SEM and EDX elemental mapping methods. Also, the emission and excitation spectra were recorded, the colour coordinates, the decay times and quantum efficiencies were obtained.  
  • Acknowledgments:
    This research has been carried out in the framework of the „Universities` Excellence Initiative” programme by the Ministry of Education, Science and Sports of the Republic of Lithuania under the agreement with the Research Council of Lithuania (project No. S-A-UEI-23-6).
  • References:
    1. G. B. Nair, H. C. Swart, S. J. Dhoble, Progress in Materials Science, 109 (2020) 1–104.
    2. J. C. A. Santos, E. P. Silva, N. R. S. Souza, Y. G. S. Alves, D. V. Sampaio, C. Kucera, L. G. Jacobsohn, J. Ballato, R. S. Silva, Ceramics International, 45 (2019) 3797–3802.
    3. A. Jain, P. Sengar, G. A. Hirata, Journal of Physics D: Applied Physics, 51 (2018) 303002 (1–62).