Abstract
In this work, the synthesis of undoped and Tm-doped ZnS nanoparticles is successfully carried out by the polyol method. From XRD analyses, it was confirmed that both types of particles possess the cubic zinc blend structure of the ZnS, and that the structure is not altered by doping. The crystallite size computed by the Scherrer equation is about 9 ± 1 nm. From photoluminescence analyses, the results show that the excitation spectrum has two excitation peaks at 304 nm and 356 nm; by exciting at 304 nm, a strong blue emission is observed at 420 nm, while exciting at 356 nm the characteristic Tm transition 1G4 → 3H6 is observed at 417 nm. By doping with Tm ions, the emission color changes from pure blue to sky according to the change in CIE coordinates from x = 0.15, y = 0.015 to x = 0.18, y = 0.17, respectively.
Highlights
IntroductionZinc sulfide (ZnS) is a semiconductor which in the size range of nanoparticles (1 - 100 nm), exhibits photoluminescent properties when it is excited by ultraviolet radiation, where the color emission is directed related to the size particle [1]
The results show that the excitation spectrum has two excitation peaks at 304 nm and 356 nm; by exciting at 304 nm, a strong blue emission is observed at 420 nm, while exciting at 356 nm the characteristic Tm transition 1G4 → 3H6 is observed at 417 nm
Zinc sulfide (ZnS) is a semiconductor which in the size range of nanoparticles (1 - 100 nm), exhibits photoluminescent properties when it is excited by ultraviolet radiation, where the color emission is directed related to the size particle [1]
Summary
Zinc sulfide (ZnS) is a semiconductor which in the size range of nanoparticles (1 - 100 nm), exhibits photoluminescent properties when it is excited by ultraviolet radiation, where the color emission is directed related to the size particle [1]. The doping with rare earth trivalent ions is very difficult by conventional methods because the difference in valence number and the higher ionic radius avoids the lanthanide ions enter to the ZnS crystal structure [14], the polyol method allows the incorporation of lanthanide ions into the ZnS structure. In this regard, this article shows the results of the effect of Tm ions on the ZnS nanoparticles, regarding the crystal structure and photoluminescent properties
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