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Dublyany, Ukraine

Pushak A.,Ukraine Academy of Printing | Vistovskyy V.,Ivan Franko National University of Lviv | Voloshinovskii A.,Ivan Franko National University of Lviv | Savchyn P.,Ivan Franko National University of Lviv | And 5 more authors.
Radiation Measurements | Year: 2013

The spectral-luminescent properties of CsI-BaCl2(1 mol%)-Eu(0.02 mol%) crystalline system are studied. Europium ion doped BaCl2 microcrystals embedded in a CsI matrix are revealed on CsI-BaCl2(1 mol%)-Eu(0.02 mol%) freshly cleaved surface by the scanning electron microscopy. The size of microcrystals is shown to be within 0.5-5 microns. The luminescent parameters of the BaCl2-Eu2+ microcrystals are shown to be similar to ones of a single crystal analogue. The 4f → 5d absorption transitions in europium ions and the reabsorption of the intrinsic emission of the CsI host are the main excitation mechanisms of europium luminescence in the BaCl2 microcrystals. © 2013 Elsevier B.V. All rights reserved.

Myagkota S.V.,Lviv State Agrarian University | Pushak A.S.,Ukrainian Academy of Printing | Stryganyuk G.B.,Institute for Scintillation Materials of Ukraine | Demkiv T.M.,Ivan Franko National University of Lviv | Demkiv L.S.,Ivan Franko National University of Lviv
Physica Status Solidi (B) Basic Research | Year: 2010

Spectral-kinetic luminescent characteristics of CsI-BaI2 (1 mol%) crystal have been studied in the 1.55-16 eV energy range at T = 10 and 295 K. The nature of luminescent centers in CsI-BaI2 has been clarified on the basis of photoluminescence excitation spectra and decay kinetics characteristics analysis. © 2010 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Pushak A.S.,Ukrainian Academy of Printing | Savchyn P.V.,Ivan Franko National University of Lviv | Vistovskyy V.V.,Ivan Franko National University of Lviv | Demkiv T.M.,Ivan Franko National University of Lviv | And 3 more authors.
Journal of Luminescence | Year: 2013

BaCl2:Eu2+ microcrystals embedded in the NaCl host have been obtained in the NaCl-BaCl2(1 mol%)-EuCl3(0.02 mol%) crystalline system. The influence of the annealing conditions on the formation of such particles has been studied. In particular, long-term annealing (at 200°s during 100 h) promotes the microcrystals formation in the NaCl-BaCl2-Eu crystalline system. The subsequent heat treatment (annealed at 600°s during 72 h and quenched to room temperature) is shown to lead to the destruction of the majority of these particles. The luminescent-kinetic properties of BaCl2:Eu2+ microcrystals have been studied upon the ultra-violet excitation by the synchrotron radiation. The X-ray excited luminescence has been measured in order to estimate the distribution of europium ions between microcrystals and the NaCl host. The excitation mechanisms of Eu2+ ions in the NaCl-BaCl2-Eu crystalline system are discussed. © 2012 Elsevier B.V.

Pushak A.S.,Ukrainian Academy of Printing | Vistovskyy V.V.,Ifranko National University Of Lviv | Myagkpta S.V.,Lviv State Agrarian University | Demkiv T.M.,Ifranko National University Of Lviv | And 4 more authors.
Functional Materials | Year: 2010

The formation of SrCl2-Eu microcrystals embedded in NaCl host has been demonstrated for NaCl-SrCl2(l mol.%)-EuCl3(0.02 mol.%) composition. The size of SrCl2-Eu microcrystals is in the 1-10 μm range. The spectral and luminescence properties of NaCl-Eu(0.1 mol.%), SrCl2-Eu(0.1 mol.%) and NaCl-SrCl2(l mol.%)-3(0.02 mol.%) crystals under optical and X-ray excitation have been studied. The luminescence parameters of SrCl2-Eu microcrystals embedded in NaCl host are revealed to be substantially similar to those of SrCl2-Eu(0.1 mol.%) single crystal. © 2010 - STC "Institute for Single Crystals".

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