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Photoluminescence decay time studies on ZnS in cubic and hexagonal phase and its mechanico-chemical interaction with polyaniline

Authors

  • Malvina Scocioreanu,

    1. National Institute of Materials Physics, Laboratory of Optical Processes in Nanostructured Materials, Bucharest-Magurele, MG-7, R77125, Romania
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  • Lucian Mihut,

    1. National Institute of Materials Physics, Laboratory of Optical Processes in Nanostructured Materials, Bucharest-Magurele, MG-7, R77125, Romania
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  • Mihaela Baibarac,

    1. National Institute of Materials Physics, Laboratory of Optical Processes in Nanostructured Materials, Bucharest-Magurele, MG-7, R77125, Romania
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  • Ioan Baltog

    Corresponding author
    1. National Institute of Materials Physics, Laboratory of Optical Processes in Nanostructured Materials, Bucharest-Magurele, MG-7, R77125, Romania
    • Phone: +40 21 3690170, Fax: +40 21 3690177
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Abstract

We report new photoluminescence (PL) data generated by pulsed optical excitation on the composites achieved by a mechanico-chemical reaction between ZnS in the cubic (c) and wurtzite (w) phases and polyaniline-emeraldine base (PANI-EB). Under continuous and pulsed optical excitation, powders of the (w)ZnS and (w)ZnS/PANI-EB composites display PL with different spectral compositions. Contrary to expectations, the (c)ZnS and the (c)ZnS/PANI-EB composite displayed weak PL and decay time in the range of nanoseconds. This results from the great involvement of the surface states in nanometric powders which creates efficient channels for the non-radiative recombination of the carriers.

original image

PL spectra of (w)ZnS/PANI-EB under continous (a) and pulsed optical excitation (b).

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