Room temperature luminescence properties of Pr3 + doped β-PbF2 powders
Low cost cubic lead fluoride (β-PbF2) is an attractive light-emitting material for dual readout purpose in homogeneous hadronic calorimeter (HHCAL), and introducing available scintillation light in PbF2 is desperately needed. Among rare earth ions RE3+, Pr3+ ions usually show a unique fast and broad electric dipole allowed 5d–4f emission transition in luminescent inorganic materials. In this work, Pr3+ doped and Pr3+, Li+ co-doped β-PbF2 powders of Pb1– x Pr x F2+α (x = 0.1%, 0.5%, 1%, 3%, 5%) and Pb0.995– y Pr0.005Li y F2+β (y = 0.3%, 0.5%, 1%, 3%, 5%) were synthesized by solid state reaction in vacuum tube furnace to obtain a fast light. Typical 4f–4f emission transitions of Pr3+ ions were observed under 3H4– 3P2 excitation in Pb1– x Pr x F2+β samples. Only 4f–4f emission transitions were observed under 4f–5d excitation because of the nonradiative relaxation of the 5d level into the lower 4f levels due to the low 4f–5d excitation transition energy (4.28 eV) of the Pr3+ ions in Pb1– x Pr x F2+α samples. The co-doping of monovalent Li ions can increase the luminescent intensity of Pr3+ ions in PbF2 host owing to the charge compensation. The decay time monitoring the 481 nm (under 4f–5d excitation) and 483 nm (under3H4-3P2 excitation) emission of Pr3+ ions in PbF2 host is 17.5 and 24.9 μs, respectively.
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Document Type: Research Article
Publication date: August 1, 2014
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