Temperature dependent spectroscopic properties of cu+ and dy3+ co-doped phosphate glass: Band gap analysis and cu nanocluster-enhanced dy3+ luminescence

José A. Jiménez

    Research output: Contribution to journalArticlepeer-review

    13 Scopus citations

    Abstract

    This paper reports on the effects of temperature on light absorption and emission in Cu+ and Dy3+ co-doped phosphate glass, which is of interest for photonic applications. First, the temperature dependence of the absorption edge of the glass in connection with Cu+ ions absorption was assessed. A thermally- induced red shift attributed to Cu+ ion-lattice interactions was observed and analyzed through optical band gap determinations in the context of indirect-allowed transitions. Application of the Varshni model for the dependence of the energy gaps with temperature allowed to estimate the 0 K energy gap at 2.87 (±0.01) eV. Furthermore, Dy3+ photoluminescence (PL) along with Cu nanoparticles (NPs) absorption was monitored in real-time during an isothermal treatment by the in situ concurrent PL and absorption microspectroscopy technique. Periods of enhancement and quenching of Dy3+ emission linked to bidirectional energy transfer processes involving nonplasmonic Cu clusters and plasmonic Cu NPs were revealed. The formation of Cu NPs was promoted by tin(II) used as reductant. It is the first time to the author’s knowledge that the 0 K energy gap is estimated for a highly Cu+-doped glass and that the enhancement of Dy3+ PL by Cu clusters is exposed.

    Original languageEnglish (US)
    Pages (from-to)399-404
    Number of pages6
    JournalChemPhysChem
    Volume20
    Issue number3
    DOIs
    StatePublished - 2019

    Keywords

    • Copper
    • Glasses
    • Luminescence
    • Nanoparticles
    • Rare earths

    ASJC Scopus subject areas

    • Atomic and Molecular Physics, and Optics
    • Physical and Theoretical Chemistry

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