摘要: In recent years, double perovskite matrix materials have gained significant attention due to their flexible struc#2;
ture, ease of doping and excellent thermal stability. While studies related to photoluminescence in rare-earth#2;
doped double perovskite matrix materials are common, research specifically focused on thermoluminescence
remains relatively scarce. In this study, a series of Y2- xSmxMgTiO6 (0≤x≤0.1) samples were synthesized using
high-temperature solid-state methods. XRD analysis revealed that the crystal structure of the samples belongs
to the monoclinic system (space group P21 /n), with Sm3+ions substituting for Y3+ions in Y2MgTiO6 . The PL
results indicated that the optimal doping concentration was Y1.95Sm0.05MgTiO6 , which exhibited emission peaks
at 568 nm, 605 nm, 652 nm, and 715 nm under blue light excitation at 409 nm. TL measurements for differ#2;
ent doping concentrations showed that Y1.98Sm0.02MgTiO6 phosphors exhibited the strongest TL signal. The
TL peaks observed at 530 K and 610 K corresponded to defects in the matrix and Sm3+dopants, respectively.
The Tm -Tstop analysis revealed that the TL curve of Y1.98Sm0.02MgTiO6 phosphors was a superposition of seven
peaks. Computerized glow curve deconvolution (CGCD) was performed on the TL of the sample according to
the results of three-dimensional thermoluminescence spectra (3D-TL) and Tm -Tstop , the trap depths in the sam#2;
ple were estimated to range from 0.69 eV to 1.49 eV. Additionally, the lifetimes of each overlapping peak were
calculated using fitting parameters. Furthermore, the dose response test showed that the saturation dose of the
sample was higher, which was 9956 Gy. Therefore, this material can serve as a thermoluminescence dosimeter
for high-dose measurements. The saturation dose for the lowest-temperature overlapping peak was found to be
102 Gy, which correlates with its specific energy level lifetime, while other overlapping peaks also exhibited favorable linear relationships.
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