Synthesis, structure and photoluminescent properties of Eu:Gd2O3 nanophosphor synthesized by cw CO2 laser vaporization

Anton I. Kostyukov, Vladimir N. Snytnikov, Vladimir N. Snytnikov, Marianna I. Rakhmanova, Nadezhda Y. Kostyukova, Arcady V. Ishchenko, Svetlana V. Cherepanova, Alexander S. Krylov, Aleksandr S. Aleksandrovsky

Research output: Contribution to journalArticlepeer-review

Abstract

Europium doped Gd2O3 sphere-like nanoparticles with dm = 9.3 ± 3.5 nm were synthesized by cw CO2 laser vaporization technique in a flowing mixture of argon and oxygen. According to XRD data, the Eu:Gd2O3 nanoparticles crystallize in the monoclinic symmetry class (C2/m space group). High-resolution luminescence spectroscopy study showed that the ultra-narrow 5D07F0 transition of Eu3+ demonstrates only two peaks corresponding to two inequivalent Cs positions of Eu3+ ion in monoclinic Gd2O3 lattice that is explained by the peculiarities of local environment of Eu3+ ion at these sites. The hypersensitive transition 5D07F2 dominates in the spectrum and is expanded to the red part of the spectrum in comparison with cubic Eu:Gd2O3 due to intense transitions terminating at higher-lying components of the crystal-field-split 7F2 state. In the luminescence spectrum, an additional weak band with the maximum at 407 nm corresponding to the electronic transitions 4f65 d1(7FJ) → 4f7(8S7/2) of Eu2+ was detected. The obtained values of chromaticity coordinates and absolute quantum yield are (0.644; 0.325) and ca. 1%, respectively. The phase transformations have been investigated using differential scanning calorimetry and thermogravimetry (50–1400 °C). After annealing in air at 700 °C, the monoclinic symmetry class of the Eu:Gd2O3 nanoparticles is preserved and the particle size increases to dm = 17.8 ± 6.1 nm. After annealing, the chromaticity coordinates (0.659; 0.334) and absolute quantum yield (ca. 4%) can be obtained using red phosphor based on monoclinic Gd2O3:Eu3+. The lifetime of the excited 5D0 state of Eu3+ in the annealed nanoparticles is longer than that in the as-synthesized nanoparticles, due to the suppression of nonradiative decay after annealing.

Original languageEnglish
Article number118050
JournalJournal of Luminescence
Volume235
DOIs
Publication statusPublished - Jul 2021

Keywords

  • Eu ions
  • Laser vaporization
  • Monoclinic GdO
  • Nanophosphors
  • Photoluminescence

OECD FOS+WOS

  • 1.06 BIOLOGICAL SCIENCES
  • 1.03 PHYSICAL SCIENCES AND ASTRONOMY
  • 1.04 CHEMICAL SCIENCES

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