title: Swift heavy ion induced structural, iono and photoluminescence properties of β-CaSiO₃:Dy³⁺ nanophosphor.
abstract: CaSiO(3):Dy(3+) (1-5 mol%) nanophosphors have been prepared by a low temperature solution combustion method. The structural and luminescence (ionoluminescence; IL and photoluminescence; PL) studies have been carried out for pristine and ion irradiated samples. The XRD patterns of pristine sample show a prominent peak at (320) for the monoclinic structure of β-CaSiO(3). Upon ion irradiation, the intensity of the prominent peak is decreased at the fluence of 7.81 × 10(12)ions cm(-2) and at higher fluence of 15.62 × 10(12)ions cm(-2), the prominent peak completely vanishes. The decrease in peak intensity might be due to the stress induced point defects. On-line IL and in situ PL studies have been carried out on pelletized samples bombarded with 100 MeV Si(7+) ions with fluences in the range (7.81-15.62)×10(12)ions cm(-2). The characteristic emission peaks at 481,574, 664 and 754 nm recorded in both IL and PL are attributed to the luminescence centers activated by Dy(3+) ions. It is found that IL and PL emissions intensity decreases with increase in Si(7+) ion fluence. The decrease in intensity can be due to the destruction of Si-O-Si and O-Si-O type species present on the surface of the sample. FTIR studies also confirm the Si-O-Si and O-Si-O type species observed to be sensitive for swift heavy ion (SHI) irradiated samples.
authors.affiliation: Prof C.N.R. Rao Centre for Nano Research (CNR), Tumkur University, Tumkur 572 103, India.
authors.forename: D V
authors.initials: DV
authors.lastname: Sunitha
authors.forename: H
authors.initials: H
authors.lastname: Nagabhushana
authors.forename: Fouran
authors.initials: F
authors.lastname: Singh
authors.forename: N
authors.initials: N
authors.lastname: Dhananjaya
authors.forename: S C
authors.initials: SC
authors.lastname: Sharma
authors.forename: B M
authors.initials: BM
authors.lastname: Nagabhushana
authors.forename: C
authors.initials: C
authors.lastname: Shivakumara
authors.forename: R P S
authors.initials: RP
authors.lastname: Chakradhar
mesh_terms: D002118:Calcium / Q000737:chemistry*; D004419:Dysprosium / Q000737:chemistry*; D020450:Heavy Ions; D049449:Luminescence; D017640:Silicates / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared; D014961:X-Ray Diffraction
chemical_list: D017640:Silicates; D004419:Dysprosium; D002118:Calcium