Luminescence property of rare-earth-doped bismuth-borate glasses with different concentrations of bismuth and rare-earth material
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Author list: Park J.M., Kim H.J., Limsuwan P., Kaewkhao J.
Publication year: 2012
Volume number: 61
Issue number: 2
Start page: 248
End page: 253
Number of pages: 6
ISSN: 0374-4884
eISSN: 0374-4884
Languages: English-Great Britain (EN-GB)
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Abstract
Bismuth-borate glass scintillators have high density and good radiation hardness. Thus, if they are highly luminescent, they can be applied in astrophysics, high-energy and nuclear physics, homeland security, radiation detection and medical imaging. Bismuth-borate glasseswith the formula xBi 2O 3:(100 - x)B 2O 3 (x = 30, 50, and 66. 7 mol%) were fabricated and doped with Nd, Er, Dy, Pr, Sm, Ho, Gd, and Ce in different dopant concentrations by using the melt-quenching technique. The X-ray emission spectra for the bismuth-borate glasses were measured and showed that only Sm-, Dy-, and Nd-doped glass scintillators had noticeable luminescence. Also, we measured the photo-luminescence and the proton-induced emission spectra. We obtained the result that Sm- and Dy- doped glass scintillators emitted luminescence. The emission peaks of the Sm- doped glass were 569, 598, 641, and 708 nm and were due to ( 4G 5/2 → 6H J) (J = 5/2, 7/2, 9/2, 11/2) transitions, respectively. The emission peaks of the Dy- doped glass were at 485 nm ( 4F 9/2 → 6H 15/2), 575 nm ( 4F 9/2 → 6H 13/2), 660 nm ( 4F 9/2 → 6H 11/2), and 755 nm ( 4F 9/2 → 6H 9/2 + 6H 11/2), and that of the Nd-doped glass was at 895 nm due to the ( 4F 3/2 → 4I 9/2) transition. The luminescence intensities were compared in terms of different Bi concentrations and dopant concentrations. © 2012 The Korean Physical Society.
Keywords
Bismuth-borate glass, Rare-earth, Scintillator
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