Luminescence behaviour of Eu3+ in hot-compressed silicate glasses

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

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Resumé

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.

OriginalsprogEngelsk
Artikelnummer100041
TidsskriftJournal of Non-Crystalline Solids: X
Vol/bind4
Udgave nummer100041
ISSN2590-1591
DOI
StatusUdgivet - 15 nov. 2019

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Silicates
Luminescence
silicates
luminescence
Glass
glass
Compaction
Electrons
Hot pressing
Electron energy levels
Raman spectroscopy
Refractive index
Photoluminescence
blanks
magnetic dipoles
oscillator strengths
glass transition temperature
electric dipoles
excitation
crystal field theory

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Cherbib, Mohamed Atef ; Kapoor, Saurabh ; Bockowski, Michal ; Smedskjær, Morten Mattrup ; Wondraczek, Lothar. / Luminescence behaviour of Eu3+ in hot-compressed silicate glasses. I: Journal of Non-Crystalline Solids: X. 2019 ; Bind 4, Nr. 100041.
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title = "Luminescence behaviour of Eu3+ in hot-compressed silicate glasses",
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 5D0 → 7F2 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 5D0 → 7F2 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 5D0 → 7F2 relative to the magnetic dipole transition of 5D0 → 7F1.",
author = "Cherbib, {Mohamed Atef} and Saurabh Kapoor and Michal Bockowski and Smedskj{\ae}r, {Morten Mattrup} and Lothar Wondraczek",
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Luminescence behaviour of Eu3+ in hot-compressed silicate glasses. / Cherbib, Mohamed Atef; Kapoor, Saurabh; Bockowski, Michal; Smedskjær, Morten Mattrup; Wondraczek, Lothar.

I: Journal of Non-Crystalline Solids: X, Bind 4, Nr. 100041, 100041, 15.11.2019.

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

TY - JOUR

T1 - Luminescence behaviour of Eu3+ in hot-compressed silicate glasses

AU - Cherbib, Mohamed Atef

AU - Kapoor, Saurabh

AU - Bockowski, Michal

AU - Smedskjær, Morten Mattrup

AU - Wondraczek, Lothar

PY - 2019/11/15

Y1 - 2019/11/15

N2 - 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 5D0 → 7F2 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 5D0 → 7F2 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 5D0 → 7F2 relative to the magnetic dipole transition of 5D0 → 7F1.

AB - 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 5D0 → 7F2 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 5D0 → 7F2 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 5D0 → 7F2 relative to the magnetic dipole transition of 5D0 → 7F1.

U2 - 10.1016/j.nocx.2019.100041

DO - 10.1016/j.nocx.2019.100041

M3 - Journal article

VL - 4

JO - Journal of Non-Crystalline Solids: X

JF - Journal of Non-Crystalline Solids: X

SN - 2590-1591

IS - 100041

M1 - 100041

ER -