Spectroscopic investigations of nanosized Cr 3+ doped Sc 2-x In x (WO 4 ) 3 : A new promising laser material

Chromium(III) doped nanosized Sc In (WO ) , (x = 0-2) solid solutions were prepared by the co-precipitation/calcination method. The obtained powders were characterized using X-ray diffraction (XRD), electron paramagnetic resonance (EPR), infrared (IR), absorption and luminescence spectra. X-ray anal...

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Bibliographic Details
Published in:Luminescence (Chichester, England) England), 2018-11, Vol.33 (7), p.1185-1193
Main Authors: Yordanova, A, Iordanova, R, Koseva, I, Nikolov, V, Kukeva, R
Format: Article
Language:English
Subjects:
Chromium - chemistry
Electron Spin Resonance Spectroscopy
Lasers
Luminescence
Nanoparticles - chemistry
Particle Size
Scandium - chemistry
X-Ray Diffraction
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Summary:Chromium(III) doped nanosized Sc In (WO ) , (x = 0-2) solid solutions were prepared by the co-precipitation/calcination method. The obtained powders were characterized using X-ray diffraction (XRD), electron paramagnetic resonance (EPR), infrared (IR), absorption and luminescence spectra. X-ray analysis showed that the compounds are pure solid solutions with orthorhombic symmetry at x values 0 and 0.5 and with monoclinic symmetry for x values 1.0, 1.5 and 2.0. The calculated crystallite size ranged from about 20 to 110 nm, except for Sc (WO ) characterized by considerably larger sizes. IR spectra of the solid solutions contain the characteristic vibrations of the WO and MeO , (Me = Sc, In) polyhedra, building the Sc (WO ) and In (WO ) structures. EPR analysis proved the presence of isolated Cr ions in the crystal field with rhombic symmetry. The presence of Cr in sites with weak and strong crystal field was revealed by absorption and luminescence spectra. This study demonstrates the effect of hosts crystal symmetry, particles size and doping concentration on the luminescence properties.
ISSN:1522-7235
1522-7243
DOI:10.1002/bio.3534