Sun Xin-Yuan, Zhu Shou-Bao, Xiao Fen, Zhou Shen-Lin, Li Lu-Nong
Department of Physics, Jinggangshan University, Ji'an, P. R. China.
School of Mechanical Engineering, Jinggangshan University, Ji'an, P. R. China.
Luminescence. 2018 Dec;33(8):1432-1437. doi: 10.1002/bio.3569. Epub 2018 Nov 6.
BaGd O :Eu scintillating phosphors by Pr -codoping were synthesized at 1300°C in air using a solid-state reaction method. The as-synthesized phosphors were characterized by X-ray diffraction (XRD), photoluminescence (PL) including excitation and emission spectra, radioluminescence (RL) spectra excited by X-ray and thermoluminescence (TL) spectra. Both the PL and RL spectra are composed of the featured trivalent europium (Eu ) without any praseodymium (Pr ) ions, and the PL and RL intensities as well as the lifetimes of BaGd O :Eu scintillating phosphors decrease dramatically with an increasing concentration of Pr ions. Finally, the TL spectra reveal the trap concentration of the existing defects decrease with an increasing concentration of Pr ions, while the relative TL intensity ratio of the high temperature band to the low temperature one increases with an increasing concentration of Pr ions, which results in the afterglow suppression of BaGd O :Eu scintillating phosphors.
采用固态反应法在空气中1300°C合成了Pr共掺杂的BaGdO:Eu闪烁体荧光粉。通过X射线衍射（XRD）、包括激发和发射光谱的光致发光（PL）、X射线激发的辐射发光（RL）光谱和热释光（TL）光谱对合成的荧光粉进行了表征。PL和RL光谱均由特征性的三价铕（Eu）组成，没有任何镨（Pr）离子，并且随着Pr离子浓度的增加，BaGdO:Eu闪烁体荧光粉的PL和RL强度以及寿命显著降低。最后，TL光谱显示，随着Pr离子浓度的增加，现有缺陷的陷阱浓度降低，而高温带与低温带的相对TL强度比增加，这导致BaGdO:Eu闪烁体荧光粉的余辉受到抑制。
