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  • Self-trapped excitonic green emission from layered semiconductors

    Author(s)
    Miah, M Idrish
    Griffith University Author(s)
    Miah, Mohammad I.
    Year published
    2009
    Metadata
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    Abstract
    Crystals of layered semiconductor are grown by Bridgman technique and are studied them under twophoton excitation by a Q-switched 20-ns pulse laser. The photoluminescence (PL) emission spectra of the crystals are measured at various pumping powers and temperatures. The PL spectra appear broad and structureless emissions with their peaks in the green spectral region. The characteristic emissions are fromself-trapped excitons of the crystals. An analysis of the spectra measured at various pumping powers shows a quadratic dependence of the PL peak intensity on the power, confirming a biphotonic process of the two-photonpumping. ...
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    Crystals of layered semiconductor are grown by Bridgman technique and are studied them under twophoton excitation by a Q-switched 20-ns pulse laser. The photoluminescence (PL) emission spectra of the crystals are measured at various pumping powers and temperatures. The PL spectra appear broad and structureless emissions with their peaks in the green spectral region. The characteristic emissions are fromself-trapped excitons of the crystals. An analysis of the spectra measured at various pumping powers shows a quadratic dependence of the PL peak intensity on the power, confirming a biphotonic process of the two-photonpumping. The temperature dependence shows an enhancement of the nonlinear response at low temperatures. The activation energy is estimated and found to be 2.4 meV. The roles of the bound excitons in the observed PL are discussed briefly.
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    Journal Title
    Materials Chemistry and Physics
    Volume
    116
    Issue
    2-3
    DOI
    https://doi.org/10.1016/j.matchemphys.2009.04.008
    Subject
    Macromolecular and materials chemistry
    Materials engineering
    Nanotechnology
    Publication URI
    http://hdl.handle.net/10072/29381
    Collection
    • Journal articles

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