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Luminescence Properties of High Y3+-doped Ce:Li6Lu(BO3)3 Scintillators

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Author(s): SUN Dan-Dan, PAN Shang-Ke, REN Guo-Hao, WU Yun-Tao, SHANG Shan-Shan, ZHANG Guo-Qing

Journal: Journal of Inorganic Materials
ISSN 1000-324X

Volume: 28;
Issue: 9;
Start page: 987;
Date: 2013;
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Keywords: solid-state synthesis; Ce:Li6Lu1-xYx(BO3)3; X-ray stimulated luminescence spectrum; PL spectrum; decay time

ABSTRACT
To decrease the high effective atomic number (Zeff) of Ce:Li6Lu(BO3)3 crystal, Y3+, which has a lower atomic number, is introduced to substitute Lu3+. The Ce:Li6Lu1-xYx(BO3)3(0≤x≤1) solid solutions were prepared by the solid-state synthesis method. Based on the X-ray powder diffraction (XRD) analysis, Ce: Li6Lu1-xYx(BO3)3 (0≤x≤1) solid solutions and Li6Gd(BO3)3 crystal have the similar XRD patterns and belong to the space group P21/c. The luminescence intensity of X-ray stimulated luminescence (XSL) spectrum of Ce:Li6Lu1-xYx(BO3) (0≤x≤1) decreases with the increasing of the content of Y3+. In the case of x=0.5, the Zeff of Ce:Li6Lu0.5Y0.5(BO3)3 is similar to that of Ce:Li6Gd(BO3)3, while the luminescence intensity of Ce:Li6Lu0.5Y0.5(BO3)3 is as much as 1.4 times of Ce:Li6Gd(BO3)3. The XSL and PL spectra of Ce:Li6Lu0.5Y0.5(BO3)3 indicate that the emission band around 400?nm can be fitted into two peaks, 391 nm and 419 nm, which correspond to the electronic transition from 5d energy level to 2F5/2 and 2F7/2 of Ce3+ ions, respectively. The decaying time of Ce:Li6Lu0.5Y0.5(BO3)3 is about 19.6 ns. When x=0.50-0.70, Ce:Li6Lu1-xYx(BO3)3(0≤x≤1) is suitable for using as neutron detection material.
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