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Tl2NaYCl6: a new self‐activated scintillator possessing an elpasolite structure
Ist Teil von
Journal of materials science. Materials in electronics, 2021-03, Vol.32 (6), p.7906-7912
Ort / Verlag
New York: Springer US
Erscheinungsjahr
2021
Link zum Volltext
Quelle
SpringerLink
Beschreibungen/Notizen
Crystalline scintillators with an elpasolite structure (A
1+
2
B
1+
C
3+
X
1−
6
) have received significant attention owing to their good energy resolution and high light yield. We also focused on Tl-based scintillators, since Tl ion has a large atomic number (
Z
= 81) and there are some reports on these scintillators which have good scintillation properties. Herein, we developed a new self-activated elpasolite crystalline scintillator, Tl
2
NaYCl
6
, with a large effective atomic number (
Z
eff
= 70.2). According to the XRD pattern, Tl
2
NaYCl
6
crystal has a tetragonal structure belonging to the P4/nbm (125) space group and with lattice constants of 1.052 and 1.060 nm. The PL excitation and emission wavelengths are 240 and 390 nm, respectively. The scintillation emission wavelength is 430 nm, which is characteristic of thallium-based self-activated scintillators and suitable for PMTs. These PL and scintillation emissions are similar to other Tl-based scintillators and attributed to self-trapped excitons. The scintillation decay time constants are 350 (80%) and 2.5 × 10
3
(20%) ns. These decay time constants are also characteristic of thallium-based self-activated scintillators. The light yield is 2.3 × 10
4
photons/MeV, which is higher than that of Ce-doped Gd
2
SiO
5
(GSO) (1.0 × 10
4
photons/MeV), a commercial scintillator, and is similar to those of other self-activated elpasolite scintillators, such as Cs
2
LiCeCl
6
(2.2 × 10
4
photons/MeV) and Tl
2
LiGdBr
6
(~ 2.7 × 10
4
photons/MeV). The energy resolution of the crystal is 6.3%, which is also better than that of the commercial scintillator, GSO (8.6%), and also similar to those of other self-activated elpasolite scintillators, such as Cs
2
LiCeCl
6
(5.5%) and Tl
2
LiGdBr
6
(7.2%).