Luminescence behaviour of Eu3+ in hot-compressed silicate glasses

Mohamed Atef Cherbib, Saurabh Kapoor, Michal Bockowski, Morten Mattrup Smedskjær, Lothar Wondraczek*

*Corresponding author

Research output: Contribution to journalLetterpeer-review

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Abstract

This paper aims to explore density-driven effects on the luminescence of Eu3+ doped silicate glasses. For this, mildly densified samples were fabricated by quasi-isostatic hot compression at up to 2 GPa from melt-quenched precursor materials. As a result of compression, both density and glass transition temperature of the blank (Eu free) and doped compositions increase. Raman spectroscopy indicates a slight increase in the intensity of vibrational modes assigned to small silicate rings and Si-O-Si bridges. Photoluminescence experiments reveal the creation of new paths of de-excitation, reducing the relative intensity of the transitions in the excitation spectra and the lifetime of the 5D07F2 emission line. Meanwhile, the luminescence intensity remains unchanged due to enhanced oscillator strength and refractive index at uniform electron-phonon coupling strength. Luminescence spectra also show a slight expansion of some of the energy levels of Eu3+, together with an increase of the bandwidth of the 5D07F2 emission line due to the crystal-field influence and growing electron population of the lower Stark sub-levels. Finally, increasing symmetry of Eu3+ sites was detected with increasing degree of compaction, resulting in a reduction of the intensity of the forced electric dipole transition of 5D07F2 relative to the magnetic dipole transition of 5D07F1.

Original languageEnglish
Article number100041
JournalJournal of Non-Crystalline Solids: X
Volume4
Number of pages6
ISSN2590-1591
DOIs
Publication statusPublished - Dec 2019

Keywords

  • Hot-compressed glasses
  • Luminescence
  • Silicate glasses
  • Trivalent europium

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