luminescence of Mn doped zinc oxide powders
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GOGLIDZE, Tatiana, DEMENTIEV, Igor, GONCEARENCO, Evghenii. luminescence of Mn doped zinc oxide powders. In: International Conference in Chemistry Kyiv-Toulouse: ICKT-9, 4-9 iunie 2017, Kyiv. Kyiv, Ukraine: 2017, Ediția a IX-a, p. 57.
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International Conference in Chemistry Kyiv-Toulouse
Ediția a IX-a, 2017
Conferința "International Conference in Chemistry Kyiv-Toulouse"
Kyiv, Ucraina, 4-9 iunie 2017

luminescence of Mn doped zinc oxide powders


Pag. 57-57

Goglidze Tatiana, Dementiev Igor, Goncearenco Evghenii
 
Moldova State University
 
Disponibil în IBN: 29 iulie 2020



Teza

This paper reports about luminescent properties of the nanocrystalized zinc oxide powders doped with Mn. Hydrothermal and chemical deposition method to synthesize ZnO powders had been used. As the source, 0.05M solution of zinc nitrate Zn(NO3)2·6H2O and urotropin C6(NH3)4 with 1:1 aspect ratio had been used. During synthesize process the doping were carried out. The impurity amount introduced in the powders were equal to 0.0003%, 0.001% and 0.01%. Photoluminescent properties (PL) in the region 350-700 nm at room temperature have been investigated. PL were excited with impulse laser “ИЛГИ-503” (λexc = 337 nm). It is established, the UV radiation is increasing with decreasing doping concentration and dominates in ZnO powder with 0.0003% Mn. In addition to the UV maximum at 385 nm, there is a “wing” in the visible region with 415 maximum using hydrothermal method for obtaining 0.0003% Mn doped ZnO powders (Fig. 1b). There is narrow UV and a weak PL band in the 550 nm range for the obtained powders by chemical deposition (Fig. 1a). Fig. 1. PL intensity spectral distribution of ZnO:Mn powders obtained by chemical deposition method (a) and hydrothermal method (b). T = 300K. The UV PL bands (385-387 nm) correspond to recombination of free exciton [1]. Manganese introduced in the ZnO occupies VZn [2] and increases oxygen vacancy concentration. It is logically to presume that centres responsible for the amplified blue bands are neutral oxygen vacancies [3]. As a result, Mn doesn’t form PL centres in the UV and visible range, but modifies defect composition of the investigated powders. 1 I.H. Akopyan, M.E. Labzovskaya et.al., SSP, 2016, 58, 1709 2 Ü. Özgür, Ya.I. Alivov et.al., J.Appl.Phys., 2005, 98., 041301 3 Liao Z-M, Zhang H-Z, Zhou Y-B et.al, Phys.Lett.A, 2008, 372, 4505