Enhanced visible emissions of Pr3+-doped oxyfluoride transparent glass-ceramics containing SrF2 nanocrystals

C. R. Kesavulu, C. S.Dwaraka Viswanath, Sujita Karki, Pabitra Aryal, H. J. Kim, C. K. Jayasankar

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38 Scopus citations

Abstract

The Pr3+-doped oxyfluoride transparent glass and glass-ceramic (GC) with the composition of 41SiO2 + 10Al2O3 + 25.5LiF + 23SrF2 + 0.5Pr2O3 were prepared and investigated their optical and luminescence properties. The formation of SrF2 nanocrystals in GC has been confirmed by X-ray diffraction (XRD) and transmission electron micrographs (TEM). The Fourier transform infrared spectroscopy (FT-IR) studies were used to examine the network structure characteristics of silicates in the glass matrices. The XRD and TEM results suggest that the Pr3+ ions are progressively incorporated into the SrF2 nanocrystals in the GC with increase in time of thermal treatment at 650 °C, corresponding to the first crystallization temperature of the glass. The obtained visible emissions of Pr3+-doped GC are several times enhanced than that in the glass and the lifetime of the 3P0 level of the Pr3+ ions in glass and GC are found to be 7 and 12 μs, respectively. Therefore, the enhanced visible emission and lifetimes in GC are due to the incorporation of Pr3+ ions into the lower phonon energy of SrF2 nanocrystals in the GCs. Moreover, the smaller difference in ionic radius between the added trivalent ions (Pr3+) and Sr2+ induces the larger enhancement of luminescence intensity in the GC. Hence, these enhanced visible luminescence properties indicate that the present glass and GC could be useful for photonic device applications.

Original languageEnglish
Pages (from-to)1737-1743
Number of pages7
JournalCeramics International
Volume44
Issue number2
DOIs
StatePublished - 1 Feb 2018

Keywords

  • Judd-Ofelt analysis
  • Optical properties
  • Oxyfluoride glass-ceramics
  • Pr-doped glass
  • SrF nanocrystals

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