Premium
Spectroscopic investigations of nanosized Cr 3+ doped Sc 2− x In x (WO 4 ) 3 : A new promising laser material
Author(s) -
Yordanova A.,
Iordanova R.,
Koseva I.,
Nikolov V.,
Kukeva R.
Publication year - 2018
Publication title -
luminescence
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.428
H-Index - 45
eISSN - 1522-7243
pISSN - 1522-7235
DOI - 10.1002/bio.3534
Subject(s) - electron paramagnetic resonance , luminescence , monoclinic crystal system , orthorhombic crystal system , analytical chemistry (journal) , materials science , crystallography , crystallite , crystal (programming language) , absorption spectroscopy , doping , calcination , infrared spectroscopy , crystal structure , chemistry , nuclear magnetic resonance , physics , optics , biochemistry , optoelectronics , chromatography , computer science , programming language , catalysis , organic chemistry
Chromium(III) doped nanosized Sc 2− x In x (WO 4 ) 3 , ( 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 2 (WO 4 ) 3 characterized by considerably larger sizes. IR spectra of the solid solutions contain the characteristic vibrations of the WO 4 and MeO 6 , (Me = Sc, In) polyhedra, building the Sc 2 (WO 4 ) 3 and In 2 (WO 4 ) 3 structures. EPR analysis proved the presence of isolated Cr 3+ ions in the crystal field with rhombic symmetry. The presence of Cr 3+ 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.