Scintillation and photoluminescence properties of (Tl1−xAx)MgCl3 (where A = alkali metal)

Miki Arai, Yutaka Fujimoto, Masanori Koshimizu, Takayuki Yanagida, Keisuke Asai

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)


We developed (Tl1−x Ax)MgCl3 (A = Li, Na, K, Rb, and Cs) crystalline scintillators to improve by cation substitution the scintillation properties of TlMgCl3, for which we have previously reported good scintillation properties (light yield = 46,000 photons/MeV and scintillation decay time constants = 60 ns (∼25%) and 350 ns (∼75%)). The X-ray-induced scintillation spectra of these (Tl1−x Ax)MgCl3 scintillators exhibited an intense emission band at 420 nm, which corresponds to the wavelength observed for TlMgCl3. This means that the light-emitting mechanisms of (Tl1−xAx)MgCl3 are similar to that in TlMgCl3. The light yields of (Tl0.995K0.005)MgCl3 (55,000 photons/MeV) and (Tl0.995Cs0.005)MgCl3 (49,000 photons/MeV) were higher than that of TlMgCl3 (46,000 photons/MeV). This is attributed to the increased number of electron–hole pairs contributing to the scintillation owing to the decreased number of trapped electrons and holes, as revealed by the lower intensity of thermoluminescence. As a result, we succeeded in increasing the light yields by cation substitution.

Original languageEnglish
Article number153871
JournalJournal of Alloys and Compounds
Publication statusPublished - 2020 May 15


  • Radioluminescence
  • Scintillator
  • TlMgCl3

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry


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