Luminescence study of Dy or Ce activated LiCaBO3 phosphor for gamma-ray and C5+ ion beam irradiation

作者：Oza Abha H; Dhoble N S; Lochab S P; Dhoble S J^*

来源：Luminescence, 2015, 30(7): 967-977.

DOI：10.1002/bio.2846

• photoluminescence
• thermoluminescence
• gamma-ray irradiation
• C5+ ion beam exposure
• trapping parameters

The photoluminescence and thermoluminescence characteristics of rare earths (Dy or Ce) activated LiCaBO3 phosphors have been studied. Phosphors were synthesized by modified solid state synthesis. The phosphors were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), photoluminescence (PL) and thermoluminescence (TL) for structural, morphological and luminescence studies. Dy3+ activated LiCaBO3 shows emission at 486 and 577nm due to F-4(9/2) -> H-6(15/2) and F-4(9/2) -> H-6(13/2) transition, respectively, whereas the PL emission spectra of Ce3+ activated LiCaBO3 phosphor shows a broad band peaking at 432 nm, which is due to the transition from 5d level to the ground state of the Ce3+ ion. The thermoluminescence study was also carried out for both these phosphors for gamma-ray irradiation and carbon beam irradiation. Linearity was studied for a 0.4-3.1 Rad dose gamma-rays. Linear behaviour over this dose range was observed. Gamma ray-irradiated phosphors were shown to be negligible fading upon storage. All the samples were also studied for 75 MeV C5+ ion beam exposure in the range of 3.75 x 10(12) - 7.5 x 10(13) ion cm(-2) fluence. In addition to this, trapping parameters of all the samples were also calculated using Chen's peak shape method.

• 出版日期2015-11