title: Luminescence study of Dy or Ce activated LiCaBO3 phosphor for γ-ray and C5+ ion beam irradiation.
abstract: 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. Dy(3+) activated LiCaBO3 shows emission at 486 and 577 nm due to (4) F9/2 →(6) H15/2 and (4) F9/2 → (6) H13/2 transition, respectively, whereas the PL emission spectra of Ce(3+) 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 Ce(3+) ion. The thermoluminescence study was also carried out for both these phosphors for γ-ray irradiation and carbon beam irradiation. Linearity was studied for a 0.4-3.1 Rad dose γ-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 C(5+) ion beam exposure in the range of 3.75 × 10(12) - 7.5 × 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.
authors: Department of Physics, RTM Nagpur University, Nagpur, 440033, India.
authors: Abha H
authors: AH
authors: Oza
authors: Department of Chemistry, Sevadal Mahila Mahavidyalaya, Nagpur, 440009, India.
authors: N S
authors: NS
authors: Dhoble
authors: Inter-University Accelerator Center, Aruna Asaf Ali Marg, New Delhi, 110067, India.
authors: S P
authors: SP
authors: Lochab
authors: Department of Physics, RTM Nagpur University, Nagpur, 440033, India.
authors: S J
authors: SJ
authors: Dhoble
mesh_terms: D001881:Borates / Q000737:chemistry*; D017610:Calcium Compounds / Q000737:chemistry*; D002563:Cerium / Q000737:chemistry*; D004419:Dysprosium / Q000737:chemistry*; D005720:Gamma Rays; D007477:Ions / Q000737:chemistry; D018020:Lithium Compounds / Q000737:chemistry*; D049449:Luminescence; D008163:Luminescent Measurements
chemical_list: D001881:Borates; D017610:Calcium Compounds; D007477:Ions; D018020:Lithium Compounds; D004419:Dysprosium; D002563:Cerium; C031316:calcium borate
keywords: C5+ ion beam exposure; photoluminescence; thermoluminescence; trapping parameters; γ-ray irradiation