Kinetic characteristics of the luminescence decay for industrial yttrium-gadolinium-aluminium garnet based phosphors

The spectral and decay kinetic characteristics of pulse cathodoluminescence and photoluminescence of phosphors based on yttrium-gadolinium-aluminum garnet were investigated using pulsed optical time resolved spectroscopy

Nanodefects in Highly Imperfect Optical Crystals

Experiments were carried out within the framework of the development program of the National Research Tomsk Polytechnic University in the project of the leading universities of theworld 5–100 (Project № VIU-OM-205/2018)

Electron Beam-Assisted Synthesis of YAG:Ce Ceramics

The work was carried out within the framework of the grant AP14870696 of the Ministry of Education and Science of the Republic of Kazakhstan. This research was funded by the Russian Science Foundation of the Russian Federation. (Grant No. 23-73-00108). A.I.P is also thankful for financial support from Latvian Project LZP-2018/1-0214. In addition, A.I.P. is thanking the Institute of Solid State Physics, University of Latvia (ISSP UL). ISSP UL as the Centre of Excellence has received funding from the European Union’s Horizon 2020 Framework Programme H2020-WIDESPREAD01-2016-2017-Teaming Phase2 under grant agreement No. 739508, project CAMART2.In this work, we present the results of the structure and luminescence properties of YAG:Ce (Y3Al5O12 doped with Ce3+ ions) ceramic samples. Their synthesis was carried out by sintering samples from the initial oxide powders under the powerful action of a high-energy electron beam with an energy of 1.4 MeV and a power density of 22–25 kW/cm2. The measured diffraction patterns of the synthesized ceramics are in good agreement with the standard for YAG. Luminescence characteristics at stationary/time-resolved regimes were studied. It is shown that under the influence of a high-power electron beam on a mixture of powders, it is possible to synthesize YAG:Ce luminescent ceramics with characteristics close to the well-known YAG:Ce phosphor ceramics obtained by traditional methods of solid-state synthesis. Thus, it has been demonstrated that the technology of radiation synthesis of luminescent ceramics is very promising. © 2023 by the authors. --//-- Karipbayev Z.T., Lisitsyn V.M., Golkovski M.G., Zhilgildinov Z.S., Popov A.I., Zhunusbekov A.M., Polisadova E., Tulegenova A., Mussakhanov D.A., Alpyssova G., Piskunov S.; Electron Beam-Assisted Synthesis of YAG:Ce Ceramics; (2023) Materials, 16 (11), art. no. 4102; DOI: 10.3390/ma16114102; https://www.scopus.com/inward/record.uri?eid=2-s2.0-85161490971&doi=10.3390%2fma16114102&partnerID=40&md5=e33da4c2d44c563881bdeffe410d734b published under the CC BY 4.0 licence.Grant AP14870696 of the Ministry of Education and Science of the Republic of Kazakhstan; Russian Science Foundation of the Russian Federation Grant No. 23-73-00108; the Latvian Council of Science LZP-2018/1-0214; ISSP UL as the Centre of Excellence has received funding from the European Union’s Horizon 2020 Framework Programme H2020-WIDESPREAD01-2016-2017-Teaming Phase2 under grant agreement No. 739508, project CAMART2

Structural and luminescent characteristics of YAG phosphors synthesized in the radiation field

YAG:Ce, YAGG:Ce ceramics were obtained by sintering the oxide powders in the radiation field. The results of investigations of the structure, composition and luminescence of ceramics are presented. The luminescence characteristics of powders exactly correspond to the phosphors luminescence used in practice obtained by solid-state synthesis methods. It has been established that in the used radiation exposure modes the main factor determining the efficiency of the synthesis is the ionization density

Structural and luminescent characteristics of YAG phosphors synthesized in the radiation field

YAG:Ce, YAGG:Ce ceramics were obtained by sintering the oxide powders in the radiation field. The results of investigations of the structure, composition and luminescence of ceramics are presented. The luminescence characteristics of powders exactly correspond to the phosphors luminescence used in practice obtained by solid-state synthesis methods. It has been established that in the used radiation exposure modes the main factor determining the efficiency of the synthesis is the ionization density

Infant mortality for the 10-year period of implementation of WHO technologies in the Republic of Kazakhstan

The article reveals an analysis of infant mortalityover a ten-year period of the introduction ofWHO technologies in the Republic of Kazakhstan.The aim of the study was to analyze infant mortalityin the Republic of Kazakhstan for the period from 2008 to2018. The authors conducted an analysis and consistentinterpretation of the results. As a result, it was found thatin order to further reduce the infant mortality rate andsave each life, a constant comprehensive analysis of theindicators is necessary taking into account the structureof infant losses.Keywords: infant mortality, WHO technologies, medicineof the Republic of Kazakhstan, maternal health.l artículo revela un análisis de la mortalidad infantildurante un período de diez años desdela introducción de las tecnologías de la OMSen la República de Kazajstán. El objetivo del estudio fueanalizar la mortalidad infantil en la República de Kazajstánpara el período de 2008 a 2018. Los autores realizaron unanálisis y una interpretación coherente de los resultados.Como resultado, se encontró que para reducir aún más latasa de mortalidad infantil y salvar cada vida, es necesarioun análisis exhaustivo constante de los indicadores teniendoen cuenta la estructura de las pérdidas infantiles

Infant mortality for the 10-year period of implementation of WHO technologies in the Republic of Kazakhstan

The article reveals an analysis of infant mortalityover a ten-year period of the introduction ofWHO technologies in the Republic of Kazakhstan.The aim of the study was to analyze infant mortalityin the Republic of Kazakhstan for the period from 2008 to2018. The authors conducted an analysis and consistentinterpretation of the results. As a result, it was found thatin order to further reduce the infant mortality rate andsave each life, a constant comprehensive analysis of theindicators is necessary taking into account the structureof infant losses.Keywords: infant mortality, WHO technologies, medicineof the Republic of Kazakhstan, maternal health.l artículo revela un análisis de la mortalidad infantildurante un período de diez años desdela introducción de las tecnologías de la OMSen la República de Kazajstán. El objetivo del estudio fueanalizar la mortalidad infantil en la República de Kazajstánpara el período de 2008 a 2018. Los autores realizaron unanálisis y una interpretación coherente de los resultados.Como resultado, se encontró que para reducir aún más latasa de mortalidad infantil y salvar cada vida, es necesarioun análisis exhaustivo constante de los indicadores teniendoen cuenta la estructura de las pérdidas infantiles

Synthesis and in situ oxidation of copper micro- and nanoparticles by arc discharge plasma in liquid

Abstract This work presents a one-step controlled method for the synthesis of copper oxide nanoparticles using an arc discharge in deionized water without subsequent thermal annealing. The synthesis conditions were varied by changing the arc discharge current from 2 to 4 A. Scanning electron microscopy images of samples synthesized at discharge current of 2 A revealed the formation of tenorite (CuO) nanopetals with an average length of 550 nm and a width of 100 nm, which had a large surface area. Arc discharge synthesis at 3 and 4 A current modes provides the formation of a combination of CuO nanopetals with spherical cuprite (Cu2O) nanoparticles with sizes ranging from 30 to 80 nm. The crystalline phase and elemental composition of the synthesized particles were identified by X-ray diffraction analysis, Raman spectroscopy and Energy dispersive analysis. As the arc discharge current was raised from 2 to 4 A, two notable changes occurred in the synthesized particles: the Cu/O ratio increased, and the particle sizes decreased. At 4 A, the synthesized particles were from 30 to 80 nm in size and had a spherical shape, indicating an increase in the amount of cuprite (Cu2O) phase. The optical band gap of the aqueous solutions of copper oxide particles also increased from 2 to 2.34 eV with increasing synthesis current from 2 to 4 A, respectively. This suggests that the proposed synthesis method can be used to tune the band gap of the final material by controlling the Cu/O ratio through the current of arc discharge. Overall, this work demonstrates a novel approach to the synthesis of copper oxide nanoparticles with controllable CuO/Cu2O/Cu ratios, which has the potential to be useful in a variety of applications, particularly due to the significant enhancement of photocatalytic abilities and widen the working spectral range