A white phosphor based on oxyfluoride nano-glass-ceramics co-doped with Eu3+ and Tb3+: Energy transfer study

Andrzej Marian Kłonkowski , Wiesław Wiczk , Jacek Ryl , Karol Szczodrowski , Dorota Wileńska

Abstract

Strontium fluoride nanocrystals doped separately with Ln3+ = Eu3+ or Tb3+ ions (95SrF2·5LnF2), as well as co-doped with both the ions (95SrF2·Eu4Tb) were synthesized for comparison. Then, glass-ceramics consisting of the mono-doped or di-doped SrF2 nanocrystals incorporated into amorphous silica (90SiO2·9.5SrF2·0.5Ln or 90SiO2·9.5SrF2·0.1EuF3·0.4Tb) were prepared by sol-gel procedure. The studied materials were characterized by XRD, while the glass-ceramics additionally by SEM and BSE (backscattered electrons) techniques. Luminescence emission and excitation spectra of the doubly doped materials exhibited presence of such effects as simultaneous independent excitation and energy transfer Tb3+ → Eu3+ as well as cross-relaxation in the materials with Tb3+ dopant. Tb3+ lifetime in 90SiO2·9.5SrF2·0.5EuF3·0.4TbF3 was distinctly reduced compared to 90SiO2·9.5SrF2·0.5TbF3 probably by the Tb3+ → Eu3+ energy transfer. Owing to blue emission of SiO2, green light emitted by Tb3+ and red one by Eu3+ the 90SiO2·9.5SrF2·0.5EuF3·0.4TbF3 nano-glass-ceramics can play a white phosphor role.
Author Andrzej Marian Kłonkowski (FCh)
Andrzej Marian Kłonkowski,,
- Faculty of Chemistry
, Wiesław Wiczk (FCh / DBCh / LP)
Wiesław Wiczk,,
- Laboratory of Photobiophysics
, Jacek Ryl
Jacek Ryl,,
-
, Karol Szczodrowski (FMPI / IEP)
Karol Szczodrowski,,
- Institute of Experimental Physics
, Dorota Wileńska (FCh / DET / LPh)
Dorota Wileńska,,
- Laboratory of Photocatalysis
Other language title versions
Journal seriesJournal of Alloys and Compounds, ISSN 0925-8388, (A 35 pkt)
Issue year2017
Vol724
Pages649-658
Publication size in sheets0.5
Keywords in Englishlanthanide(III) ions, nanocrystals, sol-gel method, nano-glass-ceramics, white phosphor
DOIDOI:10.1016/j.jallcom.2017.07.055
URL https://doi.org/10.1016/j.jallcom.2017.07.055
Languageen angielski
Score (nominal)35
ScoreMinisterial score = 35.0, 20-12-2017, ArticleFromJournal
Ministerial score (2013-2016) = 35.0, 20-12-2017, ArticleFromJournal
Publication indicators WoS Impact Factor: 2016 = 3.133 (2) - 2016=2.919 (5)
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