TY - JOUR
T1 - Improvement of X-ray storage properties of C12A7:Tb3+photo-stimulable phosphors through controlling encaged anions
AU - Li, Shengnan
AU - Liu, Yuxue
AU - Liu, Chunguang
AU - Yan, Duanting
AU - Zhu, Hancheng
AU - Xu, Changshan
AU - Ma, Li
AU - Wang, Xiaojun
N1 - Publisher Copyright:
© 2016 Elsevier B.V.
PY - 2017
Y1 - 2017
N2 - Lanthanide-doped oxide photo-stimulable (PS) phosphors (C12A7:Tb3+) with different encaged anions (O2−, H−, OH−and e−) have been prepared by a combustion method in combination with treatment under different conditions. Electron spin resonance (ESR) and Fourier transform IR (FTIR) transmittance data confirm the existences of encaged electrons, O2−(indicating the existence of encaged O2-anions) and OH−anions in C12A7:Tb3+. PS luminescence, thermoluminescence (TL), X-ray storage properties and luminescent kinetics analysis show that the more encaged OH−anions appear in C12A7, the shallower the depths of the two deeper traps (Etrap1 = ∼0.72 eV and Etrap2 = ∼0.95 eV), the smaller the glow-peak intensity ratio (Itrap2/Itrap1), the shorter the X-ray storage time and the lower the quality of X-ray imaging become. Our results suggest that, among all the anions, encaged OH−anions in C12A7:Tb3+play a key role in influencing X-ray storage properties of PS phosphors. High-quality X-ray image with a resolution of ∼15 line pairs per mm (lp/mm) has been obtained by reducing encaged OH−anions in PS phosphors. The C12A7:Tb3+PS phosphor is a potential candidate material for computed radiography system and erasable/rewritable optical memory media.
AB - Lanthanide-doped oxide photo-stimulable (PS) phosphors (C12A7:Tb3+) with different encaged anions (O2−, H−, OH−and e−) have been prepared by a combustion method in combination with treatment under different conditions. Electron spin resonance (ESR) and Fourier transform IR (FTIR) transmittance data confirm the existences of encaged electrons, O2−(indicating the existence of encaged O2-anions) and OH−anions in C12A7:Tb3+. PS luminescence, thermoluminescence (TL), X-ray storage properties and luminescent kinetics analysis show that the more encaged OH−anions appear in C12A7, the shallower the depths of the two deeper traps (Etrap1 = ∼0.72 eV and Etrap2 = ∼0.95 eV), the smaller the glow-peak intensity ratio (Itrap2/Itrap1), the shorter the X-ray storage time and the lower the quality of X-ray imaging become. Our results suggest that, among all the anions, encaged OH−anions in C12A7:Tb3+play a key role in influencing X-ray storage properties of PS phosphors. High-quality X-ray image with a resolution of ∼15 line pairs per mm (lp/mm) has been obtained by reducing encaged OH−anions in PS phosphors. The C12A7:Tb3+PS phosphor is a potential candidate material for computed radiography system and erasable/rewritable optical memory media.
KW - Phosphor
KW - Photo-stimulated luminescence
KW - Rare-earth ion
UR - http://www.scopus.com/inward/record.url?scp=85002691048&partnerID=8YFLogxK
U2 - 10.1016/j.jallcom.2016.12.021
DO - 10.1016/j.jallcom.2016.12.021
M3 - Article
AN - SCOPUS:85002691048
SN - 0925-8388
VL - 696
SP - 828
EP - 835
JO - Journal of Alloys and Compounds
JF - Journal of Alloys and Compounds
ER -