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Journal of Nanomaterials
Volume 2015, Article ID 519303, 6 pages
http://dx.doi.org/10.1155/2015/519303
Research Article

Microbe-Assisted Synthesis and Luminescence Properties of Monodispersed Tb3+-Doped ZnS Nanocrystals

1School of Environmental and Chemical Engineering, Dalian Jiaotong University, 794 Huanghe Road, Shahekou District, Dalian, Liaoning 116028, China
2College of Marine Science and Technology, Zhejiang Ocean University, 1 Hadananlu Changshidao Lincheng, Zhoushan, Zhejiang 316022, China

Received 29 August 2014; Accepted 19 October 2014

Academic Editor: Songjun Zeng

Copyright © 2015 Zhanguo Liang et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Tb3+-doped zinc sulfide (ZnS:Tb3+) nanocrystals were synthesized by spray precipitation with sulfate-reducing bacterial (SRB) culture at room temperature. The morphology of the SRB and ZnS:Tb3+ nanocrystals was examined by scanning electron microscopy, and the ZnS:Tb3+ nanocrystals were characterized by X-ray diffractometry and photoluminescence (PL) spectroscopy. The PL mechanism of ZnS:Tb3+ nanocrystals was further analyzed, and the effects of Tb3+ ion concentration on the luminescence properties of ZnS:Tb3+ nanocrystals were studied. ZnS:Tb3+ nanocrystals showed a sphalerite phase, and the prepared ZnS:Tb3+ nanocrystals had high luminescence intensity under excitation at 369 nm. The main peak position of the absorption spectra positively blueshifted with increasing concentrations of Tb3+ dopant. Based on the strength of the peak of the excitation and emission spectra, we inferred that the optimum concentration of the Tb3+ dopant is 5 mol%. Four main emission peaks were obtained under excitation at 369 nm:489 nm (5D47F6), 545 nm (5D47F5), 594 nm (5D47F4), and 625 nm (5D47F3). Our findings suggest that nanocrystals have potential applications in photoelectronic devices and biomarkers.