X-ray and photoluminescence study of Li6Gd(BO3)3:Tb3+, Dy3+ Phosphors

U. Fawad, H. J. Kim, A. Khan, H. Park, Sunghwan Kim

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3 Scopus citations

Abstract

This work is particularly dedicated to the synthesis of Li6Gd(BO3)3: Tb3+, Dy3+ (lithium gadolinium borate) phosphors by the well-known solid state reaction method and their X-ray and photoluminescence investigations. The optimal activator's concentrations (0.2 mol% for Tb3+ and 0.3 mol% for Dy3+) were determined and used for further analysis. X-ray diffraction (XRD) and scanning electron microscopy (SEM) were used for analyzing the phases, crystallinities, grain sizes and the overall morphologies of the synthesized phosphors. The X-ray and UV-VIS induced luminescence were measured. The UV induced emission spectrum of Li6Gd(BO3)3: Tb3+ phosphor showed five major peaks corresponding to the characteristic Tb3+ transitions (5Dj7Fj), whereas, Li6Gd(BO3)3: Dy3+ phosphor exhibited four major emission peaks that correspond to transitions from the ground state of f9(6H15/2) to some higher energy states of 4f9. The quantitative analyses of luminescence of the synthesized phosphors are vital for their applications in various fields. Hence, the X-ray induced light yields were measured for Li6Gd(BO3)3: Tb3+, Dy3+ phosphors to be 113% and 78% of that of gadox (gadolinium oxy sulfide, Gd2O2S: Tb3+), respectively. Hence these phosphors could be good candidates for X-ray imaging. According to Blasse's and Dexter's calculations, the dipole-dipole interaction is responsible for concentration quenching mechanism on concentrations of both phosphors. The chromaticity coordinates were measured for Li6Gd(BO3)3: Tb3+, Dy3+.

Original languageEnglish
Pages (from-to)2536-2544
Number of pages9
JournalScience of Advanced Materials
Volume7
Issue number12
DOIs
StatePublished - 2015

Keywords

  • Luminescence
  • Optical materials and Properties
  • Phosphors
  • Sintering
  • Spectroscopy

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