Thermoluminescence in mixed alkali sulphate phosphors

Abstract

In this paper we report for the first time thermoluminescence in mixed alkali sulphate materials. Very intense thermolurninescence was found out in most of the phosphors, emission in Eu doped NaKSO, and LiNaSO, being much stronger than that observed in even the applied materials like CaSO,: Dy. The glow peaks in most of the phosphors were rather too close to room temperature to prevent the fading. It is suggested that the improved preparations might increase the glow peak temperature and then these phosphors will be better than CaSO, : Dy.

Thermoluminescence and photoluminescence of LiNaSO4:Eu irradiated with 24 and 48MeV 7Li ion beam

“…Such results are reported in the literature for some phosphate-based phosphors for g-rays irradiation [18]. Sahare and Moharil [5,6] have also reported PL and TL spectra of this phosphor; however, the other weak bands, i.e., 594, 615 and 700 nm, were neither reported in PL nor in TL emission spectra in g-irradiated samples. This may be because the intensity of the exciting source used by them, might not be good enough to yield such emissions or might be due to less sensitivity of their spectrophotometer.…”

“…Sahare and Moharil [6] have studied the TL emission spectra for 412 K peak of LiNaSO 4 :Eu powder, only 440 nm band of Eu 2+ was observed. From these results it seems that the traps responsible for the 412 K peak are related to Eu 2+ .…”

“…The mixed sulfate, LiNaSO 4 doped with rare earth impurity, Eu (resulting in the compound LiNaSO 4 :Eu), has been reported earlier [5][6][7], to have a higher sensitivity than even the commercially available standard TLD phosphor, CaSO 4 :Dy ($3 times of CaSO 4 :Dy). As part of an effort to understand the TL processes and their response to energetic particles, we have irradiated LiNa-SO 4 :Eu samples to 7 Li ions at two different energies (i.e., 24 and 48 MeV), and compared their TL glow curves with that generated by g-rays irradiation.…”

5d→4f transition in halosulphate phosphors

“…Sahare et al [18][19][20] have studied some mixed sulphate system for their applications in dosing of high-energy radiations using TL technique. They have synthesized and characterized K 2 Ca 2 (SO 4 ) 3 :Eu, Dy [21] and K 2 Ca 2 (SO 4 ) 3 :Eu [22]; LiNaSO 4 :Eu [23], LiNaSO4:Eu , Dy [24] mixed sulphates.…”

Influence of Li+ and Dy3+ on structural and thermoluminescence studies of sodium sulfate

“…Phase IV was considered to be metastable, and its phase relation and structure have yet to be well established [13][14][15][16]. Mixed sulfates such as K 2 Ca 2 (SO 4 ) 3 and LiNaSO 4 have been of much interest to researchers [17][18][19][20]. Till to the date, only few works were reported on the luminescence studies of doped/codoped sodium sulfate [21][22][23].…”