title: Ca2Al2SiO7:Ce3+phosphors for mechanoluminescence dosimetry.
abstract: A series of Ce3+ion single-doped Ca2Al2SiO7phosphors was synthesized by a combustion-assisted method at an initiating temperature of 600 °C. The samples were annealed at 1100 °C for 3 h and their X-ray diffraction patterns confirmed a tetragonal structure. The phase structure, particle size, surface morphology and elemental analysis were analyzed using X-ray diffraction (XRD), transmission electron microscope (TEM), scanning electron microscopy (SEM) and energy dispersive X-ray (EDX) spectroscopy techniques. Thermoluminescence (TL) intensity increased with increase in ultraviolet (UV) light exposure time up to 15 min. With further increase in the UV irradiation time the TL intensity decreases. The increase in TL intensity indicates that trap concentration increased with UV exposure time. A broad peak at 121 °C suggested the existence of a trapping level. The peak of mechanoluminescence (ML) intensity versus time curve increased linearly with increasing impact velocity of the moving piston. Mechanoluminescence intensity increased with increase in UV irradiation time up to 15 min. Under UV-irradiation excitation, the TL and ML emission spectra of Ca2Al2SiO7:Ce3+phosphor showed the characteristic emission of Ce3+peaking at 400 nm (UV-violet) and originating from the Ce3+transitions of 5d-4f (2F5/2and2F7/2). The photoluminescence (PL) emission spectra for Ca2Al2SiO7:Ce3+were similar to the ML/TL emission spectra. The mechanism of ML excitation and the suitability of the Ca2Al2SiO7:Ce3+phosphor for radiation dosimetry are discussed. Copyright © 2016 John Wiley & Sons, Ltd.
authors.affiliation: School of Studies in Physics and Astrophysics, Pt. Ravishankar Shukla University Raipur, C.G., India.
authors.forename: Geetanjali
authors.initials: G
authors.lastname: Tiwari
authors.affiliation: School of Studies in Physics and Astrophysics, Pt. Ravishankar Shukla University Raipur, C.G., India.
authors.forename: Nameeta
authors.initials: N
authors.lastname: Brahme
authors.affiliation: Department of Physics, Govt. Arts and Commerce Girls College, Devendra Nagar, Raipur, C.G., India.
authors.forename: Ravi
authors.initials: R
authors.lastname: Sharma
authors.affiliation: School of Studies in Physics and Astrophysics, Pt. Ravishankar Shukla University Raipur, C.G., 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, C.G., India.
authors.forename: Sanjay Kumar
authors.initials: SK
authors.lastname: Sao
authors.affiliation: School of Studies in Physics and Astrophysics, Pt. Ravishankar Shukla University Raipur, C.G., India.
authors.forename: Ishwar Prasad
authors.initials: IP
authors.lastname: Sahu
mesh_terms: D000535:Aluminum / Q000737:chemistry*; D002118:Calcium / Q000737:chemistry*; D002563:Cerium / Q000737:chemistry*; D049449:Luminescence; D008163:Luminescent Measurements / Q000379:methods*; D055595:Mechanical Phenomena; D010100:Oxygen / Q000737:chemistry*; D010758:Phosphorus / Q000737:chemistry; D012825:Silicon / Q000737:chemistry*; D013696:Temperature
chemical_list: D010758:Phosphorus; D002563:Cerium; D000535:Aluminum; D010100:Oxygen; D002118:Calcium; D012825:Silicon
keywords: mechanoluminescence; optical material; photoluminescence; thermoluminescence