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Title: Rare earth Ce3+, Dy3+ activated Li2BPO5 phosphors for lyoluminescence dosimetry
Authors: Puppalwar, S P
Dhoble, S J
Kumar, Animesh
Keywords: Li2BPO5
Issue Date: Apr-2011
Publisher: NISCAIR-CSIR, India
Abstract: Rare earth Ce and Dy doped polycrystalline Li2BPO5 phosphors were prepared by high temperature solid state reaction. Photoluminescence emission spectra of the phosphor suggest the presence of Ce3+ ions in Li2BPO5:Ce and Dy3+ ions in Li2BPO5:Dy lattice sites. The prepared phosphors were characterized by the X-ray powder diffraction and photoluminescence techniques. The PL emission spectrum of Dy3+ ion under 348 nm excitation was observed at 481 nm (blue) due to 4F9/26H15/2 transitions and 576 nm (yellow) emission due to 4F9/2 6H13/2 transitions in prepared borophosphate phosphor. The PL emission spectra of Ce3+ ion was observed at 346 nm in ultraviolet region by 235 nm excitation. In this paper, PL and lyoluminescence (LL) characteristics of Li2BPO5:Ce, Dy borophosphate phosphors have been reported. The LL results show the LL emission of Li2BPO5:Ce3+, Dy3+ phosphor in blue-yellow region of the spectrum and linear response curve of LL with gamma rays exposure up to 3.5 kGy. These LL characteristics of Li2BPO5:Ce3+, Dy3+ phosphor may be useful for high radiation dose using LL technique.
Description: 239-244
ISSN: 0975-1041 (Online); 0019-5596 (Print)
Appears in Collections:IJPAP Vol.49(04) [April 2011]

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