Browsing Zinātniskie raksti (CFI) / Scientific articles by Subject "luminescence"

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    • Application of Calcium Aluminate Doped with Mn and Cr in Optical Thermometry 

      Rogulis, Uldis; Fedotovs, Andris; Rodionovs, Pavels; Kemere, Meldra; Antuzevics, Andris; Sarakovskis, Anatolijs; Alps, K.; Kiseleva, V. (Sciendo, 2023)
      Optical thermometers are advantageous for temperature measurement in electromagnetic fields and aggressive environments; however, their composition mostly relies on materials doped with expensive and resource-limited rare ...

    • Comparison of Luminescence in LiGaO2, Al2 O3 -Ga and Al2 O3 -Li Crystals 

      Trukhin, Anatoli; Trinkler, Laima; Chou, M.M.C. (Sciendo, 2018)
      We have studied luminescence of LiGaO 2 , Al 2 O 3 -Ga and Al 2 O 3 -Li crystals in order to reveal the nature of luminescence centres and mechanisms in these crystals. In Al 2 O 3 -Ga presence of Ga impurities determines ...

    • Electron Beam-Assisted Synthesis of YAG:Ce Ceramics 

      Karipbayev, Zhakyp T.; Lisitsyn, Victor M.; Golkovski, Mikhail G.; Zhilgildinov, Zhassulan S.; Popov, Anatoli I.; Zhunusbekov, Amangeldy M.; Polisadova, Elena; Tulegenova, Aida; Mussakhanov, Dossymkhan A.; Alpyssova, Gulnur; Piskunov, Sergei (MDPI, 2023)
      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 ...

    • 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 ...

    • Nanoengineered Gd3Al2Ga3O12 Scintillation Materials with Disordered Garnet Structure for Novel Detectors of Ionizing Radiation 

      Korzhik, Mikhail; Alenkov, Vladimir; Buzanov, Oleg; Fedorov, Andrei; Dosovitskiy, Georgy; Grigorjeva, Larisa; Mechinsky, Vitaliy; Sokolov, Peter; Tratsiak, Yauhen; Zolotarjovs, Aleksejs; Dormenev, Valery; Dosovitskiy, Aleksei; Agrawal, Devesh; Anniyev, Toyli; Vasilyev, Maxim; Khabashesku, Valery (Wiley-VCH Verlag, 2019)
      The search for engineering approaches to improve the scintillation properties of Gd3Al2Ga3O12 crystals and enable their production technology is of current interest. This crystal, while doped with Ce, is considered a good ...

    • Photoluminescence and Electron Spin Resonance of ilicon Dioxide Crystal with Rutile Structure (Stishovite) 

      Trukhin, Anatoly; Antuzevics, Andris (Wiley-VCH GmbH, 2018)
      An electron spin resonance (ESR) and photoluminescence signal is observed in the as grown single crystal of stishovite indicating the presence of defects in the non‐irradiated sample. The photoluminescence of the as received ...

    • Sol-gel assisted molten-salt synthesis of novel single phase Y3–2xCa2xTaxAl5−xO12:1%Eu garnet structure phosphors 

      Skruodiene, Monika; Juodvalkyte, Ruta; Inkrataite, Greta; Pakalniskis, Andrius; Ramanauskas, Rimantas; Sarakovskis, Anatolijs; Skaudzius, Ramunas (Elsevier Ltd, 2022)
      Strong absorption and emission are the key the features of any phosphor. The results obtained during this study demonstrate the difficulty of the incorporation of tantalum ions into the garnet structure and reveal that ...

    • Study on Local-Structure Symmetrization of K2XF6 Crystals Doped with Mn4+ Ions by First-Principles Calculations 

      Novita, Mega; Ristanto, Sigit; Saptaningrum, Ernawati; Supriyadi, Slamet; Marlina, Dian; Rondonuwu, Ferdy Semuel; Chauhan, Alok Singh; Walker, Benjamin; Ogasawara, Kazuyoshi; Piasecki, Michal; Brik, Mikhail G. (MDPI, 2023)
      The crystals of Mn4+-activated fluorides, such as those of the hexafluorometallate family, are widely known for their luminescence properties. The most commonly reported red phosphors are A2XF6: Mn4+ and BXF6: Mn4+ fluorides, ...

    • Synthesis and Investigation of Novel Optical Active SiO2 Glasses with Entrapped YAG:Ce Synthesized via Sol–Gel Method 

      Skruodiene, Monika; Kemere, Meldra; Inkrataite, Greta; Leimane, Madara; Ramanauskas, Rimantas; Skaudzius, Ramunas; Sarakovskis, Anatolijs (MDPI, 2023)
      We present a crack-free optically active SiO2 glass-composite material containing YAG:Ce synthesized via a modified sol–gel technique. A glass-composite material consisting of yttrium aluminum garnet doped with Ce3+ (YAG:Ce) ...