Browsing Zinātniskie raksti (CFI) / Scientific articles by Title

Now showing items 282-301 of 514

    • Luminescence of α-quartz crystal and silica glass under excitation of excimer lasers ArF (193 nm), KrF (248 nm) 

      Trukhin, Anatoli N. (Elsevier B.V., 2017)
      Luminescence of crystalline α-quartz and silica glass was studied under focused laser excitation. It was found that in crystalline α-quartz the luminescence of self-trapped exciton (STE) is excited in two-photon regime ...

    • Luminescence Properties and Decay Kinetics of Mn 2+ and Eu 3+ Co-Dopant Ions in MgGa 2 O 4 Ceramics 

      Luchechko, A.; Zhydachevskyy, Ya.; Sugak, D.; Kravets, O.; Martynyuk, N.; Popov, Anatoli I.; Ubizskii, S.; Suchocki, A. (Sciendo, 2018)
      The MgGa 2 O 4 ceramics co-doped with Mn 2+ and Eu 3+ ions were synthesized via a higherature solid-state reaction technique. The samples with various Eu 3+ concentrations were characterised using high-resolution ...

    • Luminescence properties and time-resolved spectroscopy of rare-earth doped SrMoO4 single crystals 

      Pankratova, Viktorija; Dunaeva, Elizaveta E.; Voronina, Irina S.; Kozlova, Anna P.; Shendrik, D.; Pankratov, Vladimir (Elsevier, 2022)
      Luminescence properties of nominally pure and doped with Eu3+ and Pr3+ ions SrMoO4 single crystals grown by the Czochralski method have been studied. Thermal quenching of intrinsic emission of pure and doped SrMoO4 single ...

    • Luminescence properties of chlorine molecules in glassy SiO2 and optical fibre waveguides 

      Skuja, Linards; Kajihara, Koichi; Smits, Krisjanis; Alps, Kalvis; Silins, Andrejs; Teteris, Janis (Estonian Academy Publishers, 2017)
      Glassy SiO2 is the basic material for optical fibre waveguides and manufacturing-induced Cl impurities reduce their transparency in UV spectral range. This work reports in-depth study/spectroscopic parameters of the ...

    • Luminescence Properties of Epitaxial Cu2O Thin Films Electrodeposited on Metallic Substrates and Cu2O Single Crystals 

      Trinkler, Laima; Dai, Dajin; Chang, Liuwen; Chou, Mitch Ming-Chi; Wu, Tzu-Ying; Gabrusenoks, Jevgenijs; Nilova, Dace; Ruska, Rihards; Berzina, Baiba; Nedzinskas, Ramunas (MDPI, 2023)
      The luminescent properties of epitaxial Cu2O thin films were studied in 10–300 K temperature range and compared with the luminescent properties of Cu2O single crystals. Cu2O thin films were deposited epitaxially via the ...

    • Luminescence properties of LiGaO2 crystal 

      Trinkler, Laima E.; Trukhin, Anatoli N.; Berziņa, Baiba; Korsaks, Valdis; Ščajev, Patrik; Nedzinskas, Ramiunas; Tumėnas, Saulius; Chou, Mitch Ming Chi; Chang, Liuwen; Li, Chuan (Elsevier B.V., 2017)
      The comprehensive spectral study of lithium metagallate LiGaO2 crystal has been done including methods of pump-probe techniques, optical absorption, photoluminescence, luminescence kinetics, thermoluminescence and polarised ...

    • Lung on a Chip Development from Off-Stoichiometry Thiol–Ene Polymer 

      Rimsa, Roberts; Galvanovskis, Artis; Plume, Janis; Rumnieks, Felikss; Grindulis, Karlis; Paidere, Gunita; Erentraute, Sintija; Mozolevskis, Gatis; Abols, Arturs (MDPI, 2021)
      Current in vitro models have significant limitations for new respiratory disease research and rapid drug repurposing. Lung on a chip (LOAC) technology offers a potential solution to these problems. However, these devices ...

    • Mach-Zehnder interferometer implementation for thermo-optical and Kerr effect study 

      Bundulis, Arturs; Nitiss, Edgars; Busenbergs, Janis; Rutkis, Martins (Springer Verlag, 2018)
      In this paper, we propose the Mach–Zehnder interferometric method for third-order nonlinear optical and thermo-optical studies. Both effects manifest themselves as refractive index dependence on the incident light intensity ...

    • Magnetotransport Studies of Encapsulated Topological Insulator Bi2Se3 Nanoribbons 

      Kunakova, Gunta; Kauranens, Edijs; Niherysh, Kiryl; Bechelany, Mikhael; Smits, Krisjanis; Mozolevskis, Gatis; Bauch, Thilo; Lombardi, Floriana; Erts, Donats (MDPI, 2022)
      The majority of proposed exotic applications employing 3D topological insulators require high-quality materials with reduced dimensions. Catalyst-free, PVD-grown Bi2Se3 nanoribbons are particularly promising for these ...

    • Magnetron sputtering fabrication of α-Al2O3:Cr powders and their T thermoluminescence properties 

      Grigorjeva, Larisa; Zolotarjovs, Aleksejs; Millers, Donats; Smits, Krisjanis; Krug, Peter; Stollenwerk, Johannes; Osman, Alan; Tenostendarp, Thomas (Elsevier B.V., 2018)
      For many years doped α-Al2O3 has attracted interest as a dosimeter for personal, environment monitoring and food control. The alumina single crystal growth is a difficult process; however, materials in form of powders, ...

    • Magnon and Phonon Excitations in Nanosized NiO 

      Sildos, I.; Puust, L.; Grabis, J.; Mironova-Ulmane, Nina; Kuzmin, Alexei (Sciendo, 2019)
      Single-crystal, microcrystalline and nanocrystalline nickel oxides (NiO) have been studied by Raman spectroscopy. A new band at ~200 cm-1 and TO-LO splitting of the band at 350–650 cm-1 have been found in the spectra ...

    • Manifestation of dipole-induced disorder in self-assembly of ferroelectric and ferromagnetic nanocubes 

      Zablotsky, Dmitry; Rusevich, Leonid L.; Zvejnieks, Guntars; Kuzovkov, Vladimir (Royal Society of Chemistry, 2019)
      The colloidal processing of nearly monodisperse and highly crystalline single-domain ferroelectric or ferromagnetic nanocubes is a promising route to produce superlattice structures for integration into next-generation ...

    • Matching the Directions of Electric Fields from Triboelectric and Ferroelectric Charges in Nanogenerator Devices for Boosted Performance 

      Šutka, Andris; Mālnieks, Kaspars; Lapčinskis, Linards; Timusk, Martin; Pudzs, Kaspars; Rutkis, Martins (Elsevier Inc., 2020)
      Embedding additional ferroelectric dipoles in contacting polymer layers is known to enhance the performance of triboelectricnanogenerator (TENG) devices. However, the influence of dipoles formed between the triboelectric ...

    • Measurement of Low Concentration of Nanosized Objects Suspended in a Liquid Medium 

      Merkulovs, Dmitrijs; Vilitis, Oskars; Kozlovs, V. (De Gruyter Open Ltd, 2018)
      The new optical scheme of refractometer with temperature stabilisation 10-2 °C is developed, which allows measuring a refractive index of the sample with accuracy not worse than 10-5; dependence of refraction index on ...

    • Mechanical reinforcement of electrospun poly(vinyl alcohol) by α‐FeOOH nanowires 

      Šutka, Anna; Järvekülg, Martin; Šutka, Andris; Heinmaa, Ivo; Mäeorg, Uno; Šmits, Krišjānis; Timusk, Martin (Society of Plastics Engineers (SPE), 2018)
      We report the mechanical performance of α‐FeOOH nanowire reinforced poly(vinyl alcohol) (PVA) composite nanofiber mat, fabricated using straightforward aqueous processing methods. Goethite (α‐FeOOH) nanocrystals have a ...

    • Membrane-less amphoteric decoupled water electrolysis using WO3 and Ni(OH)2 auxiliary electrodes 

      Vanags, Martins; Kulikovskis, Guntis; Kostjukovs, Juris; Jekabsons, Laimonis; Sarakovskis, Anatolijs; Smits, Krisjanis; Bikse, Liga; Sutka, Andris (Royal Society of Chemistry, 2022)
      Energy storage and delivery play a crucial role in the effective management of renewable power sources such as solar and wind. Hydrogen energy is proposed to be one of the major substitutes to fill the gap between the ...

    • Metal–Organic Frameworks (MOFs) Containing Adsorbents for Carbon Capture 

      Ansone-Bertina, Linda; Ozols, Viesturs; Arbidans, Lauris; Dobkevica, Linda; Sarsuns, Kristaps; Vanags, Edgars; Klavins, Maris (MDPI, 2022)
      In this study, new composite materials of montmorillonite, biochar, or aerosil, containing metal–organic frameworks (MOF) were synthesized in situ. Overall, three different MOFs—CuBTC, UTSA‐16, and UiO‐66‐BTEC—were used. ...

    • Methoxycarbazolyl-disubstituted dibenzofuranes as holes- and electrons-transporting hosts for phosphorescent and TADF-based OLEDs 

      Bucinskas, Audrius; Bezvikonnyi, Oleksandr; Gudeika, Dalius; Volyniuk, Dmytro; Grazulevicius, Juozas V. (Elsevier Ltd, 2020)
      In the search of universal host materials for organic light emitting diodes a new series of bipolar host materials containing methoxy-substituted carbazoles as the electron-donating and dibenzofuran as an electron-accepting ...

    • Micromechanical Properties of Gd3Ga5O12 Crystals Irradiated with Swift Heavy Ions 

      Aralbayeva, G.M.; Manika, Ilze; Karipbayev, Zh.; Suchikova, Y.; Kovachov, S.; Sugak, D.; Popov, Anatoli I. (Sumy State University, 2023)
      This study investigated the optical absorption and mechanical behavior of Gd3Ga5O12 (GGG) single crystals exposed to fast 84 Kr ions at fluences ranging from 1013 to 1014 ion/cm2. We observed that the optical absorption ...

    • Microwave-assisted synthesis and characterization of undoped and manganese doped zinc sulfide nanoparticles 

      Kuzmin, Alexei; Dile, Milena; Laganovska, Katrina; Zolotarjovs, Aleksejs (Elsevier, 2022)
      Undoped and Mn-doped ZnS nanocrystals were produced by the microwave-assisted solvothermal method and characterized by X-ray diffraction, photoluminescence spectroscopy and scanning electron microscopy with energy-dispersive ...