Browsing by Author "Bite, Ivita"

Now showing items 1-17 of 17

    • The boron effect on low temperature luminescence of SrAl2O4:Eu, Dy 

      Virginija, Vitola; Bite, Ivita; Millers, Donats K.; Zolotarjovs, Aleksejs; Laganovska, Katrina; Smits, Krisjanis; Spustaka, Agnese (Elsevier Ltd, 2020)
      Temperature dependence of the afterglow of persistent luminescence material SrAl2O4:Eu,Dy is a major problem for outdoor low temperature applications. Therefore this publication deals with tailoring the material for better ...

    • Electronic processes in doped ZnO nanopowders 

      Grigorjeva, Larisa; Zolotarjovs, Aleksejs; Bite, Ivita; Grube, Jurgis; Millers, Donats (Institute of Physics Publishing, 2019)
      ZnO nanocrystals, undoped and doped with Iridium or Indium were prepared by solar irradiation in Heliotron reactor in PROMES CNRS facilities, France. The comparative analysis of the excitonic spectra of ZnO single crystal ...

    • Gallium Concentration Optimisation of Gallium Doped Zinc Oxide for Improvement of Optical Properties 

      Spustaka, Agnese; Senko, M.; Millers, Donats; Bite, Ivita; Smits, Krisjanis; Vitola, Virginija (De Gruyter, 2021)
      The near-band luminescence of doped ZnO is promising for advanced scintillators; however, the dopant type and concentration effects require a detailed study. Undoped and Ga-doped ZnO nanopowders were prepared by a ...

    • Jūras vides kvalitātes kritēriju un pārtikas risku robežvērtību izstrāde, pamatojoties uz metālisko elementu (Cd, Cu, Hg, Pb un Zn )uzkrāšanās tendencēm Baltijas jūras un Rīgas līča zivīs 

      Bite, Ivita (Latvijas Universitāte, 2016)
      Jūras vides kvalitātes kritēriju un pārtikas risku robežvērtību izstrāde, pamatojoties uz metālisko elementu (Hg, Cd, Pb, Cu un Zn) uzkrāšanās tendencēm Baltijas jūras un Rīgas līča zivīs. Bite I., zinātniskie vadītāji ...

    • Low temperature afterglow from SrAl 2 O 4 : Eu, Dy, B containing glass 

      Vitola, V.; Lahti, Veli Matti; Bite, Ivita; Spustaka, Agnese; Millers, Donats K.; Lastusaari, Mika; Petit, L.; Smits, Krisjanis (Acta Materialia Inc, 2021)
      SrAl2O4: Eu, Dy, B particles were added in a phosphate glass (90NaPO3-10NaF (in mol%)) using the direct doping method. For the first time, the composition of the particles prior to and after embedding them in the glass was ...

    • Niobium enhanced europium ion luminescence in hafnia nanocrystals 

      Laganovska, Katrina; Bite, Ivita; Zolotarjovs, Aleksejs; Smits, Krisjanis (Elsevier B.V., 2018)
      In this work we demonstrate a method where by adding Nb ions, Ln3+ ion luminescence intensity in HfO2 is increased for up to 15 times (in a sample containing 5 mol%Eu). The effect is described as niobium acting as a charge ...

    • Novel method of phosphorescent strontium aluminate coating preparation on aluminum 

      Bite, Ivita; Krieke, Guna; Zolotarjovs, Aleksejs; Laganovska, Katrina; Liepina, Virginija; Smits, Krisjanis; Auzins, Krisjanis; Grigorjeva, Larisa; Millers, Donats; Skuja, Linards (Elsevier Ltd, 2018)
      This study presents a novel approach to produce phosphorescent coatings on metal surfaces. Strontium aluminates are the most popular modern phosphorescent materials exhibiting long afterglow at room temperature and a broad ...

    • Phase stability and oxygen-sensitive photoluminescence of ZrO2:Eu,Nb nanopowders 

      Kiisk, Valter; Puust, Laurits; Mändar, Hugo; Ritslaid, Peeter; Rähn, Mihkel; Bite, Ivita; Jankovica, Dzidra; Sildos, Ilmo; Jaaniso, Raivo (Elsevier B.V., 2018)
      We studied structure and oxygen-sensitive photoluminescence (PL) of ZrO2:Eu,Nb nanocrystalline powders synthesized via a sol-gel route and heat-treated up to 1200 °C. The material containing only 2 at% Eu3+ was predominantly ...

    • Pretestības un tranzistoru pusvadītāju nanovadu sensoru izveide gāzveida vielu analīzei 

      Bite, Ivita (Latvijas Universitāte, 2014)
      Pretestības un tranzistoru pusvadītāju nanovadu sensoru izveide gāzveida vielu analīzei. Bite I., darba vadītājs Dr. Chem. Erts D. Bakalaura darbs, 44 lapas, 25 attēli, 1 tabulas, 41 literatūras avoti. Latviešu valodā. Darbā ...

    • Production of Phosphorescent Coatings on 6082 Aluminum Using Sr0.95Eu0.02Dy0.03Al2O4-δ Powder and Plasma Electrolytic Oxidation 

      Auzins, Krisjanis; Zolotarjovs, Aleksejs; Bite, Ivita; Laganovska, Katrina; Vitola, Virginija; Smits, Krisjanis; Millers, Donats (MDPI AG, 2019)
      In this study, a new approach for producing phosphorescent aluminum coatings was studied. Using the plasma electrolytic oxidation (PEO) process, a porous oxide coating was produced on the Al6082 aluminum alloy substrate. ...

    • Re-Evaluation of Chromium Doped Alumina for Dosimetric Applications 

      Einbergs, E.; Zolotarjovs, Aleksejs; Bite, Ivita; Cipa, Janis; Vitola, Virginija; Laganovska, Katrina; Trinkler, Laima (De Gruyter, 2021)
      Many medical examinations involve ionizing radiation. Although the range of available dosimeters is rather wide, their linearity and chemical stability are limited. Recently, there has been a growing interest in new, ...

    • Recent progress in understanding the persistent luminescence in SrAl2O4:Eu,Dy 

      Vitola, Virginija; Millers, Donats; Bite, Ivita; Smits, Krisjanis; Spustaka, Agnese (Taylor and Francis Ltd., 2019)
      Ever since the discovery of SrAl2O4:Eu,Dy persistent afterglow material, that can intensively glow up to 20 h, the mechanism of long-lasting luminescence has been a popular area of research. The research is focused on ...

    • The search for defects in undoped SrAl2O4 material 

      Vitola, Virginija; Millers, Donats; Smits, Krisjanis; Bite, Ivita; Zolotarjovs, Aleksejs (Elsevier B.V., 2019)
      SrAl2O4:Eu,Dy is a very efficient long afterglow phosphor with wide range of possible applications. The luminescence properties and the possible luminescence mechanism of this material have been studied extensively, but ...

    • Sol–Gel Synthesis of Translucent and Persistent Luminescent SiO2@ SrAl2O4 Eu, Dy, B Materials 

      Leimane, Madara; Krizmane, Katrina; Bite, Ivita; Grube, Jurgis; Vitola, Virginija (MDPI, 2023)
      This publication offers an economically promising method of persistent luminescent silicate glass synthesis that does not involve high temperatures or ready-made (separately synthesized) PeL particles. In this study, we ...

    • Sub-nanosecond excitonic luminescence in ZnO:In nanocrystals 

      Grigorjeva, Larisa; Grube, Jurgis; Bite, Ivita; Zolotarjovs, Aleksejs; Smits, Krisjanis; Millers, Donats; Rodnyi, Piotr; Chernenko, Kirill (Elsevier Ltd, 2019)
      The effects of indium concentration influence on the morphology, luminescence spectra and luminescence decay kinetics of ZnO:In nanocrystals prepared by the solar physical vapour deposition method are investigated. While ...

    • Thermostimulated luminescence of plasma electrolytic oxidation coatings on 6082 aluminium surface 

      Zolotarjovs, Aleksejs; Smits, Krisjanis; Laganovska, Katrina; Bite, Ivita; Grigorjeva, Larisa; Auzins, Krisjanis; Millers, Donats; Skuja, Linards (Elsevier Ltd, 2019)
      For decades, plasma electrolytic oxidation (PEO) coatings are actively studied and applied to protect the surface of various valve metals from chemical or mechanical damage. However, over the last couple of years intense ...

    • X-ray excited luminescence of SrAl2O4:Eu,Dy at low temperatures 

      Liepina, Virginija; Millers, Donats; Smits, Krisjanis; Zolotarjovs, Aleksejs; Bite, Ivita (Elsevier B.V., 2018)