Enhanced visible light emission from Co2+ doped ZnS nanoparticles

✍ Scribed by R. Sarkar; C.S. Tiwary; P. Kumbhakar; A.K. Mitra

• Publisher: Elsevier Science
• Year: 2009
• Tongue: English
• Weight: 349 KB
• Volume: 404
• Category: Article
• ISSN: 0921-4526
• DOI: 10.1016/j.physb.2009.07.106

✦ Synopsis

ZnS nanoparticles with Co 2+ doping have been prepared at room temperature through a soft chemical route, namely the chemical co-precipitation method. The nanostructures of the prepared nanoparticles have been analyzed using X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM), selected-area electron diffraction (SAED), and UV-vis spectrophotometer. The sizes of as prepared nanoparticles are found to be in 1-4 nm range. Room-temperature photoluminescence (PL) spectrum of the undoped sample exhibits emission in the blue region with multiple peaks under UV excitation. On the other hand, in the Co 2+ doped ZnS samples enhanced visible light emissions with emission intensities of $35 times larger than that of the undoped sample are observed under the same UV excitation wavelength of 280 nm.