title: Thermoluminescence and photoluminescence studies on γ-ray-irradiated Ce³⁺,Tb³⁺-doped potassium chloride single crystals.
abstract: Single crystals of KCl doped with Ce(3+),Tb(3+) were grown using the Bridgeman-Stockbarger technique. Thermoluminescence (TL), optical absorption, photoluminescence (PL), photo-stimulated luminescence (PSL), and thermal-stimulated luminescence (TSL) properties were studied after γ-ray irradiation at room temperature. The glow curve of the γ-ray-irradiated crystal exhibits three peaks at 420, 470 and 525 K. F-Light bleaching (560 nm) leads to a drastic change in the TL glow curve. The optical absorption measurements indicate that F- and V-centres are formed in the crystal during γ-ray irradiation. It was attempted to incorporate a broad band of cerium activator into the narrow band of terbium in the KCl host without a reduction in the emission intensity. Cerium co-doped KCl:Tb crystals showed broad band emission due to the d-f transition of cerium and a reduction in the intensity of the emission peak due to (5)D3 -(7)F(j) (j = 3, 4) transition of terbium, when excited at 330 nm. These results support that energy transfer occurs from cerium to terbium in the KCl host. Co-doping Ce(3+) ions greatly intensified the excitation peak at 339 nm for the emission at 400 nm of Tb(3+). The emission due to Tb(3+) ions was confirmed by PSL and TSL spectra.
authors.affiliation: Department of Physics, Arignar Anna Government Arts College, Namakkal, India.
authors.forename: S
authors.initials: S
authors.lastname: Bangaru
authors.affiliation: Department of Physics, Arignar Anna Government Arts College, Namakkal, India.
authors.forename: K
authors.initials: K
authors.lastname: Saradha
authors.affiliation: Gandhigram Rural University, Gandhigram, India.
authors.forename: G
authors.initials: G
authors.lastname: Muralidharan
mesh_terms: D002563:Cerium / Q000737:chemistry*; D003460:Crystallization; D005720:Gamma Rays; D049449:Luminescence; D011189:Potassium Chloride / Q000737:chemistry*; D013696:Temperature; D013725:Terbium / Q000737:chemistry*
chemical_list: D013725:Terbium; D002563:Cerium; D011189:Potassium Chloride
keywords: KCl; Tb3+,Ce3+; photoluminescence; thermoluminescence