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Enhanced photoluminescence quantum yield of Ce 3+ ‐doped aluminum–silicate glasses for scintillation application

2022; Wiley; Volume: 106; Issue: 1 Linguagem: Inglês

10.1111/jace.18761

1551-2916

Tao Wu, Zhehao Hua, Gao Tang, Huiyun Ban, Hua Cai, Jifeng Han, Hui Liu, Shan Liu, S. Qian, Laishun Qin, Jing Ren, X. Sun, Xin‐Yuan Sun, Yufeng Wen, Yao Zhu,

Nuclear materials and radiation effects

Abstract Ce 3+ ‐doped 20Gd 2 O 3 –20Al 2 O 3 –60SiO 2 (GAS: x Ce 3+ ) glasses ( x = 0.3, 0.7, 1.1, 1.5, 1.9 mol%) with Si 3 N 4 as a reducing agent were prepared. The density of the glasses is around 4.2 g/cm 3 . With the increase in the Ce 3+ concentration, both the photoluminescence (PL) and PL excitation peaks of GAS: x Ce 3+ glasses show a redshift because the 4f–5d energy levels of Ce 3+ ions are narrowed. PL quantum yield and PL decay time of GAS: x Ce 3+ glasses are 28.32–50.59% and 43–64 ns, respectively. In addition, they both first increases and then decreases with the Ce 3+ concentration increasing, reached the maximum when x = 1.1 mol%. The integrated X‐ray excited luminescence (XEL) intensity of the GAS:1.1Ce 3+ glass is 23.86% of that of Bi 4 Ge 3 O 12 (BGO) crystal, and the light yield reaches 1200 ph/MeV with an energy resolution of 22.98% at 662 keV when exposed to γ‐rays. The PL and XEL thermal activation energies of GAS: x Ce 3+ glasses are independent of Ce 3+ ions concentration. Scintillating decay time of the glasses exhibits two components consisting of nanosecond and microsecond levels, and the scintillating decay time gradually decreases with the Ce 3+ concentration increasing. The difference between PL and scintillating decay time is discussed regarding the different luminescent mechanisms.