Synthesis and photoluminescence characteristics of doped ZnS nanoparticles

Yang, P Lu, M Xu, D Yuan, D Zhou, G

P. Yang et al., Synthesis and photoluminescence characteristics of doped ZnS nanoparticles, APPL PHYS A, 73(4), 2001, pp. 455-458

16

INGLESE

Article

Apllied Physucs/Condensed Matter/Materiales Science

APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING

0947-8396 → ACNP

73

4

2001

455 - 458

ISI

0947-8396(200110)73:4<455:SAPCOD>2.0.ZU;2-9

Free-standing powders of doped ZnS nanoparticles have been synthesized by u sing a chemical co-precipitation of Zn2+, Mn2+, Cu2+ and Cd2+ with sulfur i ons in aqueous solution. X-ray diffraction analysis shows that the diameter of the particles is similar to 2-3 nm. The unique luminescence properties, such as the strength (its intensity is about 12 times that of ZnS nanopart icles) and stability of the visible-light emission, were observed from ZnS nanoparticles co-doped with Cu2+ and Mn2+. The nanoparticles could be doped with copper and manganese during the synthesis without altering the X-ray diffraction pattern. However, doping shifts the luminescence to 520-540 nm in the case of co-doping with Cu2+ and Mn2+. Doping also results in a blue shift on the excitation wavelength. In Cd2+-doped ZnS nanometer-scale parti cles, the fluorescence spectra show a red shift in the emission wavelength (ranging from 450 nm to 620 nm). Also a relatively broad emission (ranging from blue to yellow) has been observed. The results strongly suggest that d oped ZnS nanocrystals, especially two kinds of transition metal-activated Z nS nanoparticles, form a new class of luminescent materials.