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024 7 _ |a 10.1016/j.jlumin.2019.03.031
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100 1 _ |a Hizhnyi, Yu.
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245 _ _ |a Origin of luminescence in ZnMoO$_4$ crystals: Insights from spectroscopic studies and electronic structure calculations
260 _ _ |a New York, NY [u.a.]
|c 2019
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500 _ _ |a © Elsevier B.V.; Final published version in progress; Post referee fulltext in progress; Embargo 12 months from publication
520 _ _ |a A set of ZnMoO$_4$ polycrystalline samples was synthesized by solid state reaction method and characterized by XRD structural analysis, ICP elemental analysis, SEM-EDX analysis, UV–Vis diffuse reflectance spectroscopy. The photoluminescence (PL) properties of ZnMoO$_4$ samples were studied in 8–300 K temperature range with use of synchrotron radiation as an excitation source. The geometry-optimized electronic structure calculations of perfect and defective ZnMoO$_4$ crystals were carried out by the DFT-based band-structure methods, plane-wave pseudo-potential (CASTEP program package) and FP-LAPW (Wien2k package). A number of point defects which can influence the luminescence properties of ZnMoO$_4$ was considered in calculations, namely the oxygen vacancy V$_o$, compensated vacancies V$_o$ + V$_{Zn}$, tungsten impurity W$_{Mo}$ and the MoO$_3$-deficient phase Zn$_3$Mo$_2$O$_9$. Comparative analysis of experimental data and calculation results allowed explanation of the origin of the red and blue-green luminescence emission bands of ZnMoO$_4$ as well as formation of their excitation spectra. It is assumed that the green component of ZnMoO$_4$ luminescence emission, like in other molybdates of M$^{II}$MoO$_4$ family (M$^{II}$ = Ca, Sr, Cd, Pb) originates from radiative annihilation of excitons self-trapped on regular MoO$_4$ groups. The Red component of ZnMoO$_4$ emission has a defect-related origin and it originates from radiative transitions in MoO$_4$ groups located near oxygen vacancies.
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700 1 _ |a Zatovsky, I.
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700 1 _ |a Nedilko, S.
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700 1 _ |a Boiko, R.
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700 1 _ |a Li, Junzhi
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700 1 _ |a Han, Wei
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700 1 _ |a Klyui, N. I.
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773 _ _ |a 10.1016/j.jlumin.2019.03.031
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856 4 _ |u https://www.sciencedirect.com/science/article/pii/S0022231318323196
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