Journal
JOURNAL OF MATERIALS RESEARCH
Volume 23, Issue 4, Pages 917-923Publisher
CAMBRIDGE UNIV PRESS
DOI: 10.1557/JMR.2008.0113
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In2-xCoxS3 (X = 0 to 0.1) micropompons (diameters similar to 3-4 mu m) consisting of similar to 10-15-nm-thick randomly self-assembled nanoflakes were synthesized hydrothermally. X-ray study indicated a steady variation of lattice parameter ratio up to 5% Co. Detailed investigations of the Co incorporation in In2S3 were carried out by optical absorbance, room temperature photoluminescence (PL), and electron paramagnetic resonance (EPR) studies. Significant blue shift in the absorbance spectra was noticed due to the crystal-field splitting of Co2+ ions in the host lattice structure. Unlike the visible emission found in undoped In2S3, PL spectra of the Co-doped samples were recognized by a strong ultraviolet emission peak at similar to 335 nm, introduced by the t(2)g level of CO2, ions, with maximum intensity for 5% Co. Room-temperature and low-temperature EPR spectra revealed octet paramagnetic bands up to 5% Co beyond which a single resonance band appeared.
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