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Eu 3+ ‐Activated Borogermanate Scintillating Glass with a High Gd 2 O 3 Content
Author(s) -
Sun XinYuan,
Jiang DaGuo,
Chen ShiWei,
Zheng GuoTai,
Huang ShiMing,
Gu Mu,
Zhang ZhiJun,
Zhao JingTai
Publication year - 2013
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.12205
Subject(s) - photoluminescence , ion , analytical chemistry (journal) , raman spectroscopy , excited state , luminescence , fourier transform infrared spectroscopy , materials science , chemistry , crystallography , physics , atomic physics , optics , optoelectronics , organic chemistry , chromatography
Eu 3+ ‐activated borogermanate scintillating glasses with compositions of 25 B 2 O 3 –40 GeO 2 –25 Gd 2 O 3 –(10− x ) La 2 O 3 – x Eu 2 O 3 were prepared by melt‐quenching method. Their optical properties were studied by transmittance, photoluminescence, Fourier transform infrared ( FTIR ), Raman and X‐ray excited luminescence ( XEL ) spectra in detail. The results suggest that the role of Gd 2 O 3 is of significance for designing dense glass. Furthermore, energy‐transfer efficiency from Gd 3+ to Eu 3+ ions can be near 100% when the content of Eu 2 O 3 exceeds x  =   4, the corresponding critical distance for Gd 3+ – Eu 3+ ion pairs is estimated to be 4.57 Å. The strongest emission intensities of Eu 3+ ions under both 276 and 394 nm excitation are simultaneously at the content of 8 mol% Eu 2 O 3 . The degree of Eu – O covalency and the local environment of Eu 3+ ions are evaluated by the value of Ω t parameters from Judd–Ofelt analysis. The calculated results imply that the covalency of Eu – O bond increases with the increasing concentration of Eu 3+ ions in the investigated borogermanate glass. As a potential scintillating application, the strongest XEL intensity under X‐ray excitation is found to be in the case of 6 mol% Eu 2 O 3 , which is slightly different from the photoluminescence results. The possible reason may be attributed to the discrepancy of the excitation mechanism between the ultraviolet and X‐ray energy.

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