Optical and electron paramagnetic resonance spectroscopy of Cd1-xMnxS quantum dots
Само за регистроване кориснике
2004
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Cd1-xMnxS quantum dots (QDs) with diameter d less than or equal to 4.5 nm and with manganese concentrations from x = 0.001 to 0.15 have been prepared using aqueous solution precipitation. Absorption and fluorescence spectra at room temperature have been recorded. No monotonic variation of the band gap energy with increasing manganese concentration is observed. The electron paramagnetic resonance (EPR) measurements were performed on a 9.5 GHz spectrometer in the temperature range 20-290 K. Two structures in the EPR spectra are observed for all the manganese concentrations: a hyperfine structure and a broad EPR line. The hyperfine structure is described by allowed and forbidden hyperfine transitions of the Mn2+ ion central sextet with hyperfine splitting constant \A\ = 9.6 mT and with axial-field splitting parameter D ranging from 11.1 to 13.5 mT. The hyperfine structure is attributed to the isolated Mn2+ ions at or near the surface of the nanocrystals. The width of the broad resonance a...nd its temperature independence suggest that the wide line originates from the noncentral manganese transitions broadened by crystal-field effects, as in some disordered materials.
Извор:
Journal of Physics: Condensed Matter, 2004, 16, 25, 4625-4633
DOI: 10.1088/0953-8984/16/25/020
ISSN: 0953-8984
WoS: 000222952800023
Scopus: 2-s2.0-3042815794
Институција/група
VinčaTY - JOUR AU - Babić-Stojić, Branka S. AU - Milivojević, Dušan AU - Čomor, Mirjana AU - Vodnik, Vesna PY - 2004 UR - https://vinar.vin.bg.ac.rs/handle/123456789/2792 AB - Cd1-xMnxS quantum dots (QDs) with diameter d less than or equal to 4.5 nm and with manganese concentrations from x = 0.001 to 0.15 have been prepared using aqueous solution precipitation. Absorption and fluorescence spectra at room temperature have been recorded. No monotonic variation of the band gap energy with increasing manganese concentration is observed. The electron paramagnetic resonance (EPR) measurements were performed on a 9.5 GHz spectrometer in the temperature range 20-290 K. Two structures in the EPR spectra are observed for all the manganese concentrations: a hyperfine structure and a broad EPR line. The hyperfine structure is described by allowed and forbidden hyperfine transitions of the Mn2+ ion central sextet with hyperfine splitting constant \A\ = 9.6 mT and with axial-field splitting parameter D ranging from 11.1 to 13.5 mT. The hyperfine structure is attributed to the isolated Mn2+ ions at or near the surface of the nanocrystals. The width of the broad resonance and its temperature independence suggest that the wide line originates from the noncentral manganese transitions broadened by crystal-field effects, as in some disordered materials. T2 - Journal of Physics: Condensed Matter T1 - Optical and electron paramagnetic resonance spectroscopy of Cd1-xMnxS quantum dots VL - 16 IS - 25 SP - 4625 EP - 4633 DO - 10.1088/0953-8984/16/25/020 ER -
@article{ author = "Babić-Stojić, Branka S. and Milivojević, Dušan and Čomor, Mirjana and Vodnik, Vesna", year = "2004", abstract = "Cd1-xMnxS quantum dots (QDs) with diameter d less than or equal to 4.5 nm and with manganese concentrations from x = 0.001 to 0.15 have been prepared using aqueous solution precipitation. Absorption and fluorescence spectra at room temperature have been recorded. No monotonic variation of the band gap energy with increasing manganese concentration is observed. The electron paramagnetic resonance (EPR) measurements were performed on a 9.5 GHz spectrometer in the temperature range 20-290 K. Two structures in the EPR spectra are observed for all the manganese concentrations: a hyperfine structure and a broad EPR line. The hyperfine structure is described by allowed and forbidden hyperfine transitions of the Mn2+ ion central sextet with hyperfine splitting constant \A\ = 9.6 mT and with axial-field splitting parameter D ranging from 11.1 to 13.5 mT. The hyperfine structure is attributed to the isolated Mn2+ ions at or near the surface of the nanocrystals. The width of the broad resonance and its temperature independence suggest that the wide line originates from the noncentral manganese transitions broadened by crystal-field effects, as in some disordered materials.", journal = "Journal of Physics: Condensed Matter", title = "Optical and electron paramagnetic resonance spectroscopy of Cd1-xMnxS quantum dots", volume = "16", number = "25", pages = "4625-4633", doi = "10.1088/0953-8984/16/25/020" }
Babić-Stojić, B. S., Milivojević, D., Čomor, M.,& Vodnik, V.. (2004). Optical and electron paramagnetic resonance spectroscopy of Cd1-xMnxS quantum dots. in Journal of Physics: Condensed Matter, 16(25), 4625-4633. https://doi.org/10.1088/0953-8984/16/25/020
Babić-Stojić BS, Milivojević D, Čomor M, Vodnik V. Optical and electron paramagnetic resonance spectroscopy of Cd1-xMnxS quantum dots. in Journal of Physics: Condensed Matter. 2004;16(25):4625-4633. doi:10.1088/0953-8984/16/25/020 .
Babić-Stojić, Branka S., Milivojević, Dušan, Čomor, Mirjana, Vodnik, Vesna, "Optical and electron paramagnetic resonance spectroscopy of Cd1-xMnxS quantum dots" in Journal of Physics: Condensed Matter, 16, no. 25 (2004):4625-4633, https://doi.org/10.1088/0953-8984/16/25/020 . .