Size-dependent photoluminescence of europium in alumina nanoparticles synthesized by cw CO2 laser vaporization

Anton I. Kostyukov, Vladimir N. Snytnikov, Aleksey V. Zhuzhgov, Svetlana V. Cherepanova, Arcady V. Ishchenko, Mark G. Baronskiy, Vladimir N. Snytnikov

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

Nanosized Eu/γ- and/or η-Al2O3 ([Eu2О3] = 0.00, 0.02, 0.45 and 0.92 wt%) powders with the particle size from <10 nm to 21 nm synthesized by cw CO2 laser vaporization were studied. It was shown that photoluminescence (PL) properties of the obtained samples are caused by luminescence of the Eu3+ and Eu2+ ions incorporated to the Al2O3 matrix in crystallographic positions with the C3v local symmetry. A scheme based on the formation of Eu2+ ions in the Al2O3 lattice via the charge compensation by oxygen vacancies (F centers) located in the first coordination sphere of europium was proposed. The influence of size effects on PL of Eu/Al2O3 nanoparticles consists first of all in shortening the lifetime of 4f – 4f transitions in Eu3+ ions as a result of increased probability of nonradiative relaxation owing to OH groups and various structural defects. It was found that the conditions of laser vaporization (gas composition and pressure) can change the structure of the resulting Eu/Al2O3 nanoparticles.

Original languageEnglish
Article number152476
Number of pages12
JournalJournal of Alloys and Compounds
Volume815
DOIs
Publication statusPublished - 30 Jan 2020

Keywords

  • Defects
  • Laser vaporization
  • Nanosized AlO
  • Photoluminescence of Eu and Eu
  • OPTICAL-PROPERTIES
  • EU3+
  • LUMINESCENCE PROPERTIES
  • IONS
  • Nanosized Al2O3
  • GAMMA-ALUMINA
  • Photoluminescence of Eu3+ and Eu2+
  • RARE-EARTH
  • LASER SPECTROSCOPY
  • CHARGE-TRANSFER ENERGY
  • NANOCRYSTALLINE EU2O3
  • SPECTRA

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