Herein, we report the luminescence and scintillation properties of various TlMg(Cl1-xBrx)3 crystals prepared under vacuum via self-seeding solidification. The emission peak wavelengths of the X-ray-induced scintillation spectra for the TlMg(Cl1-xBrx)3 crystals were similar to those of TlMgCl3. Two exponential scintillation decay time components of 19 ns (7%) and 367 ns (93%) were observed. The decay times of TlMg(Cl1-xBrx)3 were similar to those of TlMgCl3. The light yield of TlMg(Cl1-xBrx)3 (x = 0.0168, 59,000 photons/MeV) was higher than that of TlMgCl3 (˜42,000 photons/MeV) and the light yield of TlMg(Cl1-xBrx)3 peaked at 0.5–1.2 mol% and subsequently declined. This is likely due to the decreased trapping of the lattice defects as confirmed by the significantly lower thermoluminescence intensity of TlMg(Cl1–xBrx)3 (x = 0.0168) than that of TlMgCl3. These results indicated that the TlMg (Cl1-xBrx)3 crystalline scintillators could be successfully improved via anion substitution.
|Journal||Materials Research Bulletin|
|Publication status||Published - 2019 Dec|
- A. Ceramics
- A. Halides
- A. Optical materials
- B. Luminescence
- D. Phosphors