Spectral-Luminescent Properties of Titanium-Manganese Oxides

Authors V.V. Shimanovska1, L.A. Kernazhitsky1, V.V. Naumov2, L.L. Fedorenko2 , V.S. Kshnyakin3
Affiliations

1 Institute of Physics, NAS of Ukraine, 46, Nauka Prosp., 03028 Kyiv, Ukraine

2 Lashkarev Institute of Semiconductor Physics, NAS of Ukraine, 45, Nauka Prosp., 03028 Kyiv, Ukraine

3 Sumy State Pedagogical University, 87, Romenska Str., 40007 Sumy, Ukraine

Е-mail [email protected]
Issue Volume 9, Year 2017, Number 5
Dates Received 20 May 2017; revised manuscript received 13 June 2017; published online 16 October 2017
Citation V.V. Shimanovska, L.A. Kernazhitsky, et al., J. Nano- Electron. Phys. 9 No 5, 05019 (2017)
DOI 10.21272/jnep.9(5).05019
PACS Number(s) 61.46. – w, 61.72.U–, 78.67. – n, 33.20. – t
Keywords Titanium-manganese oxides, Rutile, Photoluminescence (17) , Spectroscopy (47) .
Annotation We studied the photoluminescence (PL) of titanium-manganese mixed oxides TiO2/MnOx (TMO) obtained by chemical precipitation of manganese hydroxide on particles of rutile followed by annealing at different temperatures. It is found that the PL spectra, which were observed in the range 2.4 ÷ 3.4 eV, depend essentially on the phase composition of TMO. The blue shift of PL with decreasing nanocrystallite dimensions is related to the quantum-size effect. The PL quenching is due to the effect of oxygen vacancies and nonradiative Auger recombination. At low concentration of Mn (2 ÷ 9 at%), the PL efficiency increases due to the additional centers of recombination, but with increasing Mn level above the critical value (~ 13 at%) the efficiency falls down due to the effect of concentration quenching.

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