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Continuous White Luminescence of ZnS:Pb2+ and Core/Shell ZnS:Pb2+/ZnS Nanocrystals

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Abstract:

High-quality water-soluble ZnS:Pb2+ nanocrystals were synthesized via a simple chemical co-depositing method. The as-synthesized ZnS:Pb2+ nanocrystals show high monodispersity and crystallinity with a narrow size distribution (3.2±0.4 nm). ZnS:Pb2+/ZnS core/shell structures were also obtained by coating a ZnS shell displaying significantly enhanced photoluminescence (PL) intensity and photostability. For the ZnS:Pb2+/ZnS samples the position of emission spectrum shows a red-shift of approximately 10 nm, which produces a fairly pure white emission with Commission Internationale de l'Eclairage (CIE) coordinates of (0.31, 0.33). These phenomena are explained by a model of multiple Pb2+ luminescent centers.

Keywords: CORE/SHELL; NANOCRYSTALS; PHOTOLUMINESCENCE; WHITE LUMINESCENCE; ZNS:PB2+; ZNS:PB2+/ZNS

Document Type: Research Article

DOI: http://dx.doi.org/10.1166/jnn.2011.5237

Publication date: November 1, 2011

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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