Development of Yb2+-doped SrBrI and BaBrI crystalline scintillators

Kohei Mizoi, Yutaka Fujimoto, Daisuke Nakauchi, Masanori Koshimizu, Takayuki Yanagida, Keisuke Asai

Research output: Contribution to journalArticlepeer-review

Abstract

Photoluminescence (PL) and scintillation properties are reported for SrBrI:Yb2+ and BaBrI:Yb2+ crystals grown by a self-seeding solidification method. In both samples, the Yb2 spin-allowed and spin-forbidden 4f135d1 → 4f14 transitions were observed for both PL and scintillation. For scintillation, a single emission band at approximately 460 nm was observed for both samples, which was attributed to the spin-allowed Yb2+ 5d–4f transition. The scintillation decay time constants of SrBrI:Yb2+ and BaBrI:Yb2+ were estimated to be 1.6 and 1.4 μs, respectively. The light yields of SrBrI:Yb2+ and BaBrI:Yb2+ were 20,000 and 28,000–44,000 photons/MeV, respectively. The light yield of 1 mol% Yb2+-doped BaBrI (44,000 photons/MeV) was higher than that of NaI:Tl (40,000 photons/MeV), and the energy resolution of 0.5 mol% Yb2+-doped BaBrI (7.7%) was comparable to that of NaI:Tl (7.5%). BaBrI:Yb2+ has potential for application in pulse-counting mode detectors owing to its high light yields, high energy resolution, moderate scintillation decay time constants with ~1 μs, and low deliquescence.

Original languageEnglish
Article number118399
JournalJournal of Luminescence
Volume240
DOIs
Publication statusPublished - 2021 Dec

Keywords

  • 5d–4f transition
  • Mixed-anion compound
  • Radioluminescence
  • Scintillator
  • Yb ion

ASJC Scopus subject areas

  • Biophysics
  • Atomic and Molecular Physics, and Optics
  • Chemistry(all)
  • Biochemistry
  • Condensed Matter Physics

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