Multiband orange-red luminescence of Eu3+ ions based on the pyrochlore-structured host crystal

Shinobu Fujihara, Kazuaki Tokumo

Research output: Contribution to journalArticle

122 Citations (Scopus)

Abstract

Pyrochlore-type yttrium stannate (Y2Sn2O7) doped with trivalent europium ions (Eu3+) was synthesized as thin films by the sol-gel method. X-ray diffractometry, high-resolution transmission electron microscopy, and X-ray photoelectron spectroscopy were used to evaluate the crystallinity and purity of the films, which was of prime importance in investigating the optical properties. It was shown that heat treatment of the films at 1000°C was enough to obtain highly crystalline and phase-pure samples. Photoluminescence spectra of the (Y1-xEux) 2Sn2O7 (x = 0.01-0.20) films indicated the simultaneous occurrence of five predominant orange-red band emissions at a single-wavelength ultraviolet excitation due to doubly split magnetic-dipole 5Do → 7F1 and electric-dipole 5D07F2 transitions. Inhomogeneous broadening possibly arising from the site-to-site variation of Eu3+ was also observed. These results demonstrate that we have succeeded in synthesizing a single-phase crystalline phosphor material having the chromaticity corresponding to a region between pink and yellowish pink.

Original languageEnglish
Pages (from-to)5587-5593
Number of pages7
JournalChemistry of Materials
Volume17
Issue number22
DOIs
Publication statusPublished - 2005 Nov 1

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Chemistry

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