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Li K.,Tianjin University of Technology | Li K.,Key Laboratory for Optoelectronic Materials and Devices of Tianjin | Zhang X.,Tianjin University of Technology | Zhang X.,Key Laboratory for Optoelectronic Materials and Devices of Tianjin | And 10 more authors.
Hongwai yu Jiguang Gongcheng/Infrared and Laser Engineering | Year: 2013

PbS nanocrystals with different precursor molar of [S2-]/[Pb2+] were prepared in alcohols medium from water-solubility precursors. The crystal structure, average particle size, morphology and luminescence properties of as-synthesized products were characterized by X-ray diffraction (XRD) spectra, transmission electron microscope (TEM) images, ultraviolet-visible (UV-VIS) absorption spectra and photoluminescence (PL) spectra. The XRD patterns show that the average particle size of the samples is calculated to be increased from 3.9 nm to 5.9 nm with the [S2-]/[Pb2+] molar ratio enhanced. The PL emission peak position is red-shifted from 1009 nm to 1486 nm. The influence of different [S2-]/[Pb2+] molar ratios on growth rate of PbS nanocrystals was discussed and the growth mechanism was thought to be the diffusion-controlled growth model via Ostwald ripening.

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