Eu3 + amidst ionic copper in glass: Enhancement through energy transfer from Cu+, or quenching by Cu2 +?

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Abstract

A barium-phosphate glass system doped with europium(III) and containing a high concentration of copper(I) together with a copper(II) remnant has been studied spectroscopically. The main object is to elucidate whether the orange-red emission of Eu3 + ions succeeds through sensitization via luminescent Cu+ ions or else is preferentially quenched by non-radiative transfer to Cu2 +. A characterization of the melt-quenched glass was first performed by UV/Vis optical absorption, 31P nuclear magnetic resonance and infrared absorption spectroscopy. A photoluminescence (PL) spectroscopy and emission decay dynamics assessment was subsequently performed. Despite the concentration of Cu+ being estimated to be much higher than that of Cu2 +, the data shows that quenching of Eu3 + PL by Cu2 + dominates. The lifetime analysis of emitting centers Cu+ and Eu3 + points to the origin of the manifestation being that the Eu3 + → Cu2 + non-radiative transfer rate responsible for the quenching is almost two times higher than that for the Cu+ → Eu3 + transfer accountable for the enhancement. Finally, an effort was made for the determination of Cu2 + in the glass containing Cu+, Cu2 + and Eu3 + ions based on the Eu3 + (5D0) emission decay rates. It was found to be in excellent agreement with the UV/Vis spectrophotometric approach, thus supporting the utility of Eu3 + ions for optical sensing of copper(II) in the solid state.

Original languageEnglish (US)
Pages (from-to)979-985
Number of pages7
JournalSpectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy
Volume173
DOIs
StatePublished - Feb 15 2017
Externally publishedYes

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Keywords

  • Energy transfer
  • Glasses
  • Optical absorption
  • Photoluminescence spectroscopy

ASJC Scopus subject areas

  • Analytical Chemistry
  • Atomic and Molecular Physics, and Optics
  • Instrumentation
  • Spectroscopy

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