YAN Hong, SONG Ting, ZHANG Meng etc. Microstructure and Optical Properties of 12CaO&middot;7Al<sub>2</sub>O<sub>3</sub>:Pr<sup>3+</sup> Phosphors for High Quality X-ray Imaging[J]. Chinese Journal of Luminescence, 2018,39(7): 895-902
YAN Hong, SONG Ting, ZHANG Meng etc. Microstructure and Optical Properties of 12CaO&middot;7Al<sub>2</sub>O<sub>3</sub>:Pr<sup>3+</sup> Phosphors for High Quality X-ray Imaging[J]. Chinese Journal of Luminescence, 2018,39(7): 895-902 DOI: 10.3788/fgxb20183907.0895.
Microstructure and Optical Properties of 12CaO·7Al2O3:Pr3+ Phosphors for High Quality X-ray Imaging
) with different doping concentrations were synthesized by a combustion method. For C12A7:0.3%Pr
3+
phosphor
the strongest intensity of the emission peak at 486 nm
originating from
3
P
0
-
3
H
4
transition of Pr
3+
can be obtained upon 232 nm excititation. After the annealing in vacuum
the number of encaged O
2-
anions decreased
while the amount of empty cages increased. Thus
it led to the increased number of traps and the enhanced photo-stimulable luminescence(PSL). The thermoluminescence(TL) analysis showed that there existed two deep traps in the phosphors and the trap depths were~0.69 and~0.80 eV
respectively. In particular
the annealing in vacuum led to the deeper trap depths
the increased number of traps and the improved storage properties. Upon X-ray irradiation(applied dose:5.2 Gy)
a blue image with high resolution was obtained by 808 nm stimulation. Our results suggested that the C12A7:Pr
3+
phosphors have potential application in the field of computed radiography.
关键词
Keywords
references
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