Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9829734 | Journal of Crystal Growth | 2005 | 7 Pages |
Abstract
Mn-doped ZnS nanocrystals of about 3Â nm diameter were synthesized by a wet chemical method. X-ray diffraction (XRD) measurements showed that the nanocrystals have the structure of cubic zinc blende. The broadening of the XRD lines is indicative of nanomaterials. Room temperature photoluminescence (PL) spectrum of the undoped sample only exhibited a defected-related blue emission band. But for the doped samples, an orange emission from the Mn2+ 4T1â6A1 transition was also observed, apart from the blue emission. The peak position (600Â nm) of the Mn2+ emission was shifted to longer wavelength compared to that (584Â nm) of bulk ZnS:Mn. With the increase of the Mn2+ concentration, the PL of ZnS:Mn was significantly enhanced. The concentration quenching effect was not observed in our experiments. Such PL phenomena were attributed to the absence of Mn2+ pairs in a single ZnS:Mn nanocrystal, considering the nonradiative energy transfer between Mn2+ ions based on the Poisson approximation.
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Condensed Matter Physics
Authors
W.Q. Peng, S.C. Qu, G.W. Cong, Z.G. Wang,