Characterization of sol-gel SiO2:Ce,Tb powder and pulsed laser deposited thin film phosphors

O. M. Ntwaeaborwa, M. S. Dhlamini, R. A. Harris, J. R. Botha, Ulrich Buttner, H. C. Swart

    Research output: Contribution to journalConference articlepeer-review

    Abstract

    Thin films of SiO2:Ce,Tb (Ce = Tb = 0.5 mol%) nanoparticulate phosphor (nanophosphor) were ablated on Si (100) substrates using either the conventional pulsed laser deposition (PLD) or pulsed reactive crossed beam laser ablation (PRCLA) technique. Morphology and surface topography of the films were analysed with scanning electron microscopy (SEM) and atomic force microscopy (AFM) respectively. The chemical composition and thicknesses of the films were determined by Rutherford backscattering spectroscopy (RBS). Luminescence properties of the films were studied with cathodoluminescence (CL) spectroscopy and a 325 nm HeCd laser. Enhanced green cathodoluminescence and photoluminescence (PL) associated with 5D4→7F4 transitions in Tb3+ was observed at ∼540 nm in powder and thin film samples, and is attributed to non-radiative energy transfer from codoped Ce3+. Luminescence intensities of the films and that of the SiO2:Ce,Tb powder used to make the films are compared.

    Original languageEnglish (US)
    Pages (from-to)602-605
    Number of pages4
    JournalPhysica Status Solidi (C) Current Topics in Solid State Physics
    Volume5
    Issue number2
    DOIs
    StatePublished - Dec 1 2008
    EventE-MRS 2007 Spring Meeting-Symposium F - Novel Gain Materials and Devices Based on III-N-V Compounds - Strasbourg, France
    Duration: May 28 2007Jun 1 2007

    ASJC Scopus subject areas

    • Condensed Matter Physics

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