Crystal structure and photoluminescence properties of garnet−type as−synthesized and aged Li7La3−xZr2O12:xTb phosphors

K. Park, D. H. Kim, D. A. Hakeem, G. W. Jung, S. W. Kim

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

The crystal structure and photoluminescence (PL) properties of Tb3+−activated garnet−type Li7La3−xZr2O12 garnet phosphors are reported. As−synthesized Li7La3−xZr2O12:xTb (0.02 ≤ x ≤ 0.10) phosphors form a tetragonal crystal structure and emit efficient green light due to the 5D47F5 transition of Tb3+. On the other hand, aged Li7La3−xZr2O12:xTb phosphors form mixed tetragonal and cubic crystal structures and contain a small amount of Li2CO3. The aged LLZO:xTb phosphors are brownish due to the oxidation of Tb3+ to Tb4+. The Tb4+ ions act as quenching sites for Tb3+ green emission owing to their strong absorption in UV–visible region. The aging significantly degrades emission intensities and color quality due to the presence of Tb4+ and Li2CO3.

Original languageEnglish
Pages (from-to)10194-10202
Number of pages9
JournalCeramics International
Volume46
Issue number8
DOIs
Publication statusPublished - 2020 Jun 1
Externally publishedYes

Keywords

  • Aged phosphor
  • Calcination
  • Mixing
  • Optical properties
  • Powders: solid state reaction

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Process Chemistry and Technology
  • Surfaces, Coatings and Films
  • Materials Chemistry

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