Local structure and photoluminescence properties of nanostructured Zn_1‐xMn_xS material

Abstract

Zinc sulfide (ZnS) pure or doped has received remarkable attention because of fundamental properties, versatility and potential for several technological applications as luminescent material. In this study, the local structure and photoluminescence properties of nanostructured Zn1‐xMnxS samples have been characterized. X‐ray diffraction results show that ZnS:Mn samples crystallized completely without the presence of secondary phases and the diffraction patterns correspond to the cubic zinc blende. Theoretical and experimental XANES (X‐ray absorption near edge structure) spectra at Zn K‐edge suggest the incorporation of Mn atoms into the ZnS host and indicate the occurrence of Zn and S vacancies, which are confirmed by EXAFS (extended X‐ray absorption fine structure) fit results. These vacancies can be related to a red‐shift observed in the peak emission of photoluminescence spectrum for ZnS sample, which is centered at ∼ 504 nm. As the Mn content increases, a yellow‐orange emission centered at ∼ 590 nm can be observed besides the blue‐green emission, which is associated with the 4T1–6A1 transition within the 3d shell of Mn2+. (© 2015 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

Metal Substitutions (M = Al, Ga, In; Sn, Ge; and Mn, Fe, Co) in ZnS: Sphalerite versus Wurtzite Formation

“…M = Mn: Wurtzite Stabilization. Despite that in several recent papers on nanostructured Zn 1−x Mn x S compounds, the structure is always reported to be cubic, 29,30 our quenched ceramic samples crystallize in the wurtzite form similar to the results in refs 11, 31. This is illustrated in Figure S4 by the XRD patterns.…”

The Critical Role of Thioacetamide Concentration in the Formation of ZnO/ZnS Heterostructures by Sol-Gel Process

“…Significant differences in XANES shape and white line positions can be observed between the standard ZnO and ZnS references. The FT of ZnO EXAFS spectrum is characterized by two main contributions, the first one corresponding to the oxygen tetrahedral coordination shell at 1.96 Å and a second one related to the zinc second next neighbors at 3.23 Å [ 38 ], whereas ZnS presents essentially a first tetrahedral sulfur coordination shell at 2.34 Å and a broad contribution with low intensity compared to ZnO corresponding to the zinc second next neighbors at 3.82 Å [ 39 ].…”

Effect of Different Synthesis Methods on the Textural Properties of Calcium Tungstate (CaWO4) and Its Catalytic Properties in the Toluene Oxidation

“…As shown by FE-SEM micrographs, the average particle size is lower for these samples. Due to this, large Effect of Different Synthesis Methods on the Textural Properties of Calcium Tungstate (CaWO 4 ) and Its Catalytic Properties in the Toluene Oxidation amount of the atoms should be placed at the boundary of particles resulting in a lower number of neighbours 48 .…”