title: Fracto-mechanoluminescence and thermoluminescence properties of UV and γ-irradiated Ca₂Al₂SiO₇:Ce³⁺ phosphor.
abstract: Ce(3+)-doped calcium aluminosilicate phosphor was prepared by a combustion-assisted method at an initiating temperature of 600°C. Structural characterization was carried out using X-ray diffraction (XRD) and scanning electron microscopy (SEM). The absorption spectra of Ca2Al2SiO7:Ce(3+) showed an absorption edge at 230 nm. The optical characterization of Ca2Al2SiO7:Ce(3+) phosphor was investigated in a fracto-mechanoluminescence (FML) and thermoluminescence (TL) study. The peak of ML intensity increased as the height of impact of the moving piston increased. The TL intensity of Ca2Al2SiO7:Ce(3+) was recorded for different exposure times of UV and γ-irradiation and it was observed that TL intensity was maximum for a UV irradiation time of 30 min and for a γ-dose of 1180 Gy. The TL intensity had three peaks for UV irradiation at temperatures 82°C, 125°C and 203°C. Also the TL intensity had a single peak at 152°C for γ-irradiation. The TL and ML emission spectra of Ca2Al2SiO7:Ce(3+) phosphor showed maximum emission at 400 nm. The possible mechanisms involved in the TL and ML processes of the Ca2Al2SiO7:Ce(3+) phosphor are also explained.
authors.affiliation: School of Studies in Physics and Astrophysics, Pt. Ravishankar Shukla University Raipur, Chhattisgarh, India.
authors.forename: Geetanjali
authors.initials: G
authors.lastname: Tiwari
authors.affiliation: School of Studies in Physics and Astrophysics, Pt. Ravishankar Shukla University Raipur, Chhattisgarh, India.
authors.forename: Nameeta
authors.initials: N
authors.lastname: Brahme
authors.affiliation: Department of Physics, Arts and Commerce Girls College, Devendra Nagar, Raipur, 492001, Chhattisgarh, India.
authors.forename: R
authors.initials: R
authors.lastname: Sharma
authors.affiliation: School of Studies in Physics and Astrophysics, Pt. Ravishankar Shukla University Raipur, Chhattisgarh, India.
authors.forename: D P
authors.initials: DP
authors.lastname: Bisen
authors.affiliation: School of Studies in Physics and Astrophysics, Pt. Ravishankar Shukla University Raipur, Chhattisgarh, India.
authors.forename: Sanjay Kumar
authors.initials: SK
authors.lastname: Sao
authors.affiliation: Department of Physics, Amity University, Gwalior (M.P.).
authors.forename: Manisha
authors.initials: M
authors.lastname: Singh
mesh_terms: D000535:Aluminum / Q000737:chemistry*; D002118:Calcium / Q000737:chemistry*; D002563:Cerium / Q000737:chemistry*; D005720:Gamma Rays; D049449:Luminescence; D010100:Oxygen / Q000737:chemistry; D012825:Silicon / Q000737:chemistry*; D013696:Temperature; D014466:Ultraviolet Rays
chemical_list: D002563:Cerium; D000535:Aluminum; D010100:Oxygen; D002118:Calcium; D012825:Silicon
keywords: mechanoluminescence; silicate materials; thermoluminescence