Please use this identifier to cite or link to this item: http://hdl.handle.net/10995/75674
Title: New amorphous nanophosphors obtained by evaporation of silicates and germanates REE
Authors: Zuev, M. G.
Il'ves, V. G.
Sokovnin, S. Y.
Vasin, A. A.
Zhuravleva, E. Y.
Issue Date: 2017
Publisher: Walter de Gruyter GmbH
Citation: New amorphous nanophosphors obtained by evaporation of silicates and germanates REE / M. G. Zuev, V. G. Il'ves, S. Y. Sokovnin et al. // Pure and Applied Chemistry. — 2017. — Vol. 89. — Iss. 10. — P. 1505-1520.
Abstract: Amorphous nanophosphors have been produced by pulsed electron beam evaporation of bulk phosphors of rare earth elements (REE) silicates and germanates with oxyapatite structure activated with europium. The processes of crystallization of amorphous nanopowders (NP) have been studied by differential scanning calorimetry and thermogravimetry (40-1400°C) methods. A modification of the Raman and IR spectra of the samples was found when the particle size decreased from bulk to nanostate due to insignificant polymerization of Si(Ge)O4 tetrahedra. The spectral and luminescence characteristics of the bulk samples as well as nanoamorphous samples have been examined. It was established that Eu3+ forms two types of optical centers. Upon the transition of Sr2Gd8(SiO4)6O2:Eu3+ phosphor from bulk state to nanostate during laser excitation, the luminescence intensity of Eu3+ ions increases 10 times. Blue and white amorphous nanophosphors have been obtained for the first time by evaporation of Ca2M8(SiO4)6O2:Eu (M=Y, Gd) and Ca2La8(GeO4)O2:Eu phosphors. Radiation reduction of ions Eu3+→Eu2+ in electron beam has been presumably found. © 2017 IUPAC & De Gruyter.
Keywords: EU2+
EU3+
LUMINESCENCE
MENDELEEV XX
NANOPHOSPHORS
NANOTECHNOLOGY
SYNTHESIS
UV-VISIBLE SPECTROSCOPY
VIBRATIONAL SPECTRA
X-RAY DIFFRACTION
DIFFERENTIAL SCANNING CALORIMETRY
ELECTRON BEAMS
EUROPIUM
EVAPORATION
EXCITED STATES
GERMANIUM
LASER EXCITATION
LIGHT EMISSION
LUMINESCENCE
NANOTECHNOLOGY
PARTICLE SIZE
PHOSPHORS
SILICATES
SYNTHESIS (CHEMICAL)
THERMOGRAVIMETRIC ANALYSIS
ULTRAVIOLET VISIBLE SPECTROSCOPY
VIBRATIONAL SPECTRA
X RAY DIFFRACTION
BLUE AND WHITES
LUMINESCENCE CHARACTERISTICS
LUMINESCENCE INTENSITY
MENDELEEV XX
NANOPHOSPHORS
PULSED ELECTRON BEAMS
RAMAN AND IR SPECTRUM
UV VISIBLE SPECTROSCOPY
EUROPIUM COMPOUNDS
URI: http://hdl.handle.net/10995/75674
Access: info:eu-repo/semantics/openAccess
SCOPUS ID: 85029357807
WOS ID: 000411395800009
PURE ID: 2125898
ISSN: 0033-4545
DOI: 10.1515/pac-2016-1118
Appears in Collections:Научные публикации, проиндексированные в SCOPUS и WoS CC

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