Luminescence and vacuum ultraviolet excitation spectroscopy of samarium doped SrB4O7

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Abstract

Sm2+ and Sm3+ co-doped SrB4O7 could be utilized in several high-level optical devices and fundamental knowledge about the optical behavior of these materials benefits the development of luminescent applications. Herein, we report luminescence and its vacuum ultraviolet (VUV) excitation spectra in samarium doped SrB4O7. Both, Sm2+ and Sm3+ luminescence centers have been examined and distinguished in the emission and the excitation spectra investigated under synchrotron radiation. The contribution of either Sm2+ or Sm3+ emission lines into the emission spectra heavily depended on the excitation energy, and strong f-f transitions of both Sm2+ and Sm3+ were detected. At 10 K, a broad intrinsic luminescence in the UV range was detected and attributed to the radiative transition of either bound or self-trapped exciton in SrB4O7. The optical behavior, including e.g. inter-configurational f-d transitions of Sm(n+) were elucidated with first-principles calculations. Partial density of states well represents the changes of the electronic states that are related to the samarium doping, which in turn explains the emerging features in excitation spectra. In summary, the obtained results clarify the excitation and emission behavior of samarium doped SrB4O7.

Detaljer

Författare
  • Anu Tuomela
  • Meng Zhang
  • Marko Huttula
  • Simas Sakirzanovas
  • Aivaras Kareiva
  • Anatoli I. Popov
  • Anna P. Kozlova
  • S. Assa Aravindh
  • Wei Cao
  • Vladimir Pankratov
Enheter & grupper
Externa organisationer
  • University of Oulu
  • East China University of Science and Technology
  • Vilnius University
  • Laboratory of Hybrid Nanostructured Materials, NUST MISiS
  • University of Latvia
Forskningsområden

Ämnesklassifikation (UKÄ) – OBLIGATORISK

  • Den kondenserade materiens fysik

Nyckelord

Originalspråkengelska
Artikelnummer154205
TidskriftJournal of Alloys and Compounds
Volym826
StatusPublished - 2020 jun 15
PublikationskategoriForskning
Peer review utfördJa