Abstract
In this work, ZnO, Ce3+ doped ZnO (ZnO/Ce3+) and Cu2+ + Ce3+ co-doped ZnO (ZnO/Cu2+ + Ce3+ ) solid solutions powders were synthesized by a solution combustion method maintaining the Ce3+ ion concentration constant in 3%Wt while the Cu2+ ion concentration was varied in 1, 2, 3, 10 and 20%Wt. After its synthesis, all the samples were annealed at 900?C by 24 h. The ZnO, ZnO/Ce3+ and ZnO/Cu2+ + Ce3+ powders were structurally characterized using X-ray diffraction (XRD) technique, and the XRD patterns showed that for pure ZnO, Cu2+ undoped ZnO/Ce3+ and ZnO/Ce3+ doped with the Cu2+ ion, the three samples exhibited the hexagonal wurtzite ZnO crystalline structure. However, the morphology and particle size of both samples were observed by means of a scanning electron microscopy (SEM); from SEM image, it is observed that the crystallites of both samples are agglomerated forming bigger amorphous particles with an approximate average size of 1 μm. In addition, the photoluminescence of the ZnO, Ce3+ doped ZnO and Cu2+ + Ce3+ doped ZnO samples was measurement under an illumination of 209 nm wavelength (UV region): for the ZnO/Ce3+ sample, your emission spectrum is in the visible region from blue color until red color; the UV band of the ZnO is suppressed. The multicolor emission visible is attributed to the Ce3+ ion photoluminescence, while for the ZnO/Cu2+ + Ce3+, its emission PL spectrum is quenching by the Cu2+ ion, present in the ZnO crystalline.
Highlights
IntroductionBetween the II-VI semiconductors compounds, the Zinc oxide (ZnO) by its extraordi-. S
Between the lanthanide ions family members, the cerium ion (Ce) is the most emblematic according to the studies realized by various researchers [24] [25] [26] [27], from its results the authors show that the Ce3+ doped Zinc oxide (ZnO) can present anomalous emission from the UV until red color region; this multiple emission is studied in the present work
The ZnO/Ce3+ and ZnO/Cu2+ + Ce3+ samples obtained were structurally characterized by x-ray diffraction (XRD) technique using a Philips PW 1800 diffractometer with CuKα radiation (1.5406 Å), the morphology of the samples was recorded using a scanning electron microscopy SEM JEOL JSM 840.), the properties photoluminescent (PL) of the ZnO/Ce3+ and ZnO/Cu2+ + Eu3+ samples was studied by means of a spectrofluorometer FluoroMax-P that uses a xenon lampas excitation source, the wavelength excitation was of 209 nm
Summary
Between the II-VI semiconductors compounds, the Zinc oxide (ZnO) by its extraordi-. S. As a complement for the present work, it is necessary to mention that the doping of the ZnO matrix with Cu2+ ions leads to sum or produce changes that improve the ZnO properties such as: band gap tailored, magnetic, electrical and optical. It can produce passivation of defects and surfaces, as p-type dopant in the original n-type ZnO semiconductor. ZnO/Ce3+ and co-doped ZnO/Cu2+ + Ce3+ solid solutions powders have been synthesized by solution combustion method as a function of the Cu2+ ion concentration in %Wt. maintaining the Ce3+ ion concentration constant at a value of 3%Wt. for both compounds Cu2+ undoped and doped. The influence of the Cu2+ ion on the morphology, structure and photoluminescence of the compounds is analyzed
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