Ce-doped Li6Ln(BO3)3 (Ln=Y, Gd) Single crystals fibers grown by micro-pulling down method and luminescence properties

Abstract

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Scintillation properties of Li6Y0.5Gd0.5(BO3)3: Ce3+ single crystal

“…This comparison shows similar emission spectra of the crystal induced by x-ray and laser that ranges in the wavelength region of 350-500 nm peaking at 406 nm. Literature reveals the same wavelength range for X-ray excited spectra with the peak position at 405 nm for both LYBO and LGBO [20,33].…”

“…LGBO crystal has the potential to be used as a radiation detector due its good scintillation and luminescence properties [10,18,19]. 6 Li, 10 B, 157 Gd, 155 Gd isotopes interact with thermal neutrons that produce charged particles and γ-rays with MeV energy, which are capable of exciting some luminescence centers in the crystal lattice and emit signals to be detected by the optical sensors [20]. The presence of 6 Li (n, α), 10 B (n, α) and 155, 157 Gd (n, γ) with thermal neutron capture cross-sections of δ¼520 b, δ¼2100 b and δ¼17,000 b, 70,000 b, respectively make LYBO and…”

“…Both crystals share several similarities including physical (such as crystal structure, melting temperatures and transparency to visible light), optical and can be presumed that the same structure and space group is owned by their mixed crystal i.e. LYGBO [20,29]. The similar properties of LYBO and LGBO, favor the conditions of making a mixed crystal of both.…”

“…LGBO has the theoretical light yield of 59,600 ph/neutrons, however its high effective atomic number (Z eff ¼46) and density (ρ¼3.24 g/cm 3 ), impedes its applications in the n/γ mixed fields [20,25]. Addition of low effective atomic number (Z eff ¼26) and density (ρ¼2.76 g/cm 3 ) materials (LYBO) can resolve this issue by reducing its γ sensitivity [16,20,30].…”

“…Addition of low effective atomic number (Z eff ¼26) and density (ρ¼2.76 g/cm 3 ) materials (LYBO) can resolve this issue by reducing its γ sensitivity [16,20,30]. A rough estimation of density of the grown LYGBO crystal is carried out by mass volume ratio i.e.…”