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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Sal'nikova E. I., Denisenko Y. G., Kolesnikov I. E., Lahderanta E., Andreev O. V., Azarapin N. O., Basova S. A., Gubin A. A., Oreshonkov A. S.
Заглавие : Synthesis and luminescent properties of (RE0.95Ln0.05)2O2S (RE = La, Y; Ln = Ho, Tm)
Место публикации : J. Solid State Chem. - 2021. - Vol. 293. - Ст.121753. - ISSN 00224596 (ISSN), DOI 10.1016/j.jssc.2020.121753
Примечания : Cited References: 33
Аннотация: Solid solutions of oxysulfides (RE0.95Ln0.05)2O2S (RE = La, Y; Ln = Ho, Tm) were obtained by hydrogen reduction of the co-precipitated sulfates followed by sulfidation of the reaction products. The crystal chemical characteristics of the obtained compounds were refined by the Rietveld method. Morphological certification of particles in the dynamics of synthesis was performed. Most of the particles produced by chemical reactions have a cut that indicates the formation of a compound with a hexagonal syngony with angles of 60 and 120°. This indicates that the thermal effect of gaseous reagents H2, H2S on sulfates leads to heterogeneous reactions of thermal dissociation and the formation of new phases. Steady state luminescence properties displayed characteristic sharp bands corresponding to 4f-4f transitions. Luminescence decay curves of all studied samples showed monoexponential decay with microsecond and hundreds microsecond lifetimes depending on doping ions. Calculated color coordinates of Ho3+ and Tm3+-doped powders make them promising candidates to be used as phosphors.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Sal'nikova E. I., Аndreev О. V., Molokeev M. S., Aleksandrovsky A. S., Biryukov D. Yu., Zatsepin D. A., Oreshonkov A. S., Glukhova P. О., Azarapin N. O., Shulaev N. А., Garipov D. A., Volkova S. S., Denisenko Yu. G.
Заглавие : Synthesis and electron dependent properties of the phosphor Gd2O2S:Ce3+, Tb3+
Колич.характеристики :9 с
Место публикации : ChemistrySelect. - 2025. - Vol. 10, Is. 23. - Ст.e00964. - ISSN 23656549 (eISSN), DOI 10.1002/slct.202500964
Примечания : Cited References: 53. - The study was carried out with the support of the Ministry of Science and Higher Education of the Russian Federation within the framework of the project “Fundamental problems of development methodology and related legal and ethical regulation in the field of application of artificial intelligence systems and models” (FEWZ-2024–0052). D.A. Zatsepin and D.Yu. Biryukov are grateful to the Ministry of Science and Higher Education of Russian Federation (FEUZ-2023–0014) for support. Yu. G. Denisenko, A.S. Aleksandrovsky, and A.S. Oreshonkov are grateful for support by ′′Priority- 2030′′ program for the Tyumen State University and Siberian Federal University, and the state assignment of Kirensky Institute of Physics (FWES-2024–0003). The results of UV spectroscopy were obtained using the equipment of the Center for Collective Use "Rational Nature Management and Physical-Chemical Research" of Tyumen State University
Аннотация: A substitutional solid solution of (Gd0.94Ce0.03Tb0.03)2O3 (Ia3, a = 10.8496 (5) A, V = 1277.1 (2) A3) was obtained by hydrothermal synthesis from rare earth nitrates and sodium hydroxide, followed by calcination in air at 900 °C for 2 h. The subsequent sulfidation of the compound in a hydrogen sulfide stream at 900 °C for 9 h yielded a substitutional solid solution of the oxysulfide (Gd0.94Ce0.03Tb0.03)2O2S (P3m1, a = 3.8682 (4) A, c = 6.6770 (8) A, V = 86.52 (2) A3). A qualitative and quantitative analysis of the obtained samples was carried out using the Rietveld method, along with morphological characterization of the particles. A mechanism for the transformation of particles at different stages of synthesis has been proposed. Combined experimental and theoretical investigations showed possibility of both direct and indirect electronic transitions in (Gd0.94Ce0.03Tb0.03)2O2S. Density functional theory calculations highlighted the complex nature of charge transfer in lanthanide oxysulfides, suggesting further investigations. The results of the study on the photoluminescent properties of the obtained phosphors showed that Tb3+ ions play a major role in the emission processes, with the most intense emission band occurring in the green spectral region at 538 nm. In addition to the narrow terbium bands, weak cerium emission was also observed, covering a broad spectral range of 350-700 nm.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : LOSEVA G. V., MUKOED G. M., Ovchinnikov S. G., RYABINKINA L. I.
Заглавие : ELECTRIC AND MAGNETIC-PROPERTIES OF MES.FE2O3 OXYSULFIDES
Место публикации : Fiz. Tverd. Tela. - 1992. - Vol. 34, Is. 6. - P1765-1769. - ISSN 0367-3294
Примечания : Cited References: 16
Предметные рубрики: INSULATOR TRANSITION
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Sal'nikova E. I., Denisenko Y., Aleksandrovsky A. S., Kolesnikov I. E., Lahderanta E., Andreev P. O., Azarapin N. O., Andreev O. V., Basova S. A., Matigorov A. V.
Заглавие : Synthesis and optical properties RE2O2S:Ln (RE = La, Y; Ln = Ce, Eu, Dy, Er)
Место публикации : J. Solid State Chem. - 2019. - Vol. 279. - Ст.120964. - ISSN 00224596 (ISSN), DOI 10.1016/j.jssc.2019.120964
Примечания : Cited References: 53
Аннотация: The phase formation sequence was studied in the preparation of solid solutions of RE2O2S: Ln’ (RE = La, Y; Ln’ = Ce, Eu, Dy, Er) by the reduction of the match co-precipitated sulfates, followed by sulfidization of the reduction products. For uniform distribution of cations in the matrix, a method of chemical homogenization was used, consisting in the preparation of an aqueous solution containing all the necessary cations and their subsequent precipitation in the form of sulfates. The use of sulfates as precursors facilitates the process of obtaining solid solutions of oxysulfides, since sulfates already contain SO4 2--ions. The phase and morphological certification of the obtained solid solutions was carried out. The study of steady state luminescent properties demonstrated characteristic bands which are assigned to 4f-4f and 5d-4f transition. The obtained results showed the possibility of applying the method to synthesize optical ceramics based on solid solutionsRE2O2S: Ln (RE = La, Y; Ln = Ce, Eu, Dy, Er).
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