Annealing temperature dependent afterglow of Tb~(3+) doped CaAl_2O_4

Zhai Bao-gai; Xu Hanfei; Huang Yuan Ming

摘要

At the doping level of 1 mol%, Tb3+ doped CaAl2O4 (Tb-doped CaAl2O4) nanocrystals were synthesized via the sol-gel combustion technique. Green afterglow was recorded for the as-prepared Tb-doped CaAl2O4. The effects of subsequent annealing on the green afterglow of Tb-doped CaAl2O4 were investigated by means of X-ray diffractometry, scanning electron microscopy, transmission electron microscopy, photoluminescence spectroscopy, afterglow spectroscopy, and thermoluminescence dosimetry, respectively. Both the intensity and duration of the afterglow of Tb-doped CaAl2O4 are found to decrease with the increase in the annealing temperature when annealing temperature is lower than 600 ?C. Afterglow of Tb-doped CaAl2O4 is completely quenched as annealing temperature is over 700 ?C. In combination with annealing temperature dependent photoluminescence and thermoluminescence of Tb-doped CaAl2O4, our results indicate that the degradation of the afterglow can be linked to the oxidation of Tb3+ into Tb4+ at high annealing temperatures.commentSuperscript/Subscript Available/commentABSTRACT At the doping level of 1 mol%, Tb3+ doped CaAl2O4 (Tb-doped CaAl2O4) nanocrystals were synthesized via the sol-gel combustion technique. Green afterglow was recorded for the as-prepared Tb-doped CaAl2O4. The effects of subsequent annealing on the green afterglow of Tb-doped CaAl2O4 were investigated by means of X-ray diffractometry, scanning electron microscopy, transmission electron microscopy, photoluminescence spectroscopy, afterglow spectroscopy, and thermoluminescence dosimetry, respectively. Both the intensity and duration of the afterglow of Tb-doped CaAl2O4 are found to decrease with the increase in the annealing temperature when annealing temperature is lower than 600 ?C. Afterglow of Tb-doped CaAl2O4 is completely quenched as annealing temperature is over 700 ?C. In combination with annealing temperature dependent photoluminescence and thermoluminescence of Tb-doped CaAl2O4, our results indicate that the degradation of the afterglow can be linked to the oxidation of Tb3+ into Tb4+ at high annealing temperatures.

机译：在1mol％的掺杂水平，通过溶胶 - 凝胶燃烧技术合成Tb3 +掺杂CaAL2O4（TB掺杂CaAL2O4）纳米晶体。为AS制备的TB掺杂CAAL2O4记录绿色余辉。通过X射线衍射法，扫描电子显微镜，透射电子显微镜，光致发光光谱，余辉光谱和热致发光剂量测定，研究了随后的退火对Tb掺杂CaAL2O4的绿色余辉的影响。发现Tb掺杂CaAL2O4的余辉的强度和持续时间都发现，当退火温度低于600Ω·C时，随着退火温度的增加而降低。 Tb掺杂CaAL2O4的余辉完全淬火，因为退火温度超过700℃。结合退火温度依赖性光致发光和TB掺杂CaAL2O4的热致发光，我们的结果表明，在高退火温度下，余辉的降解可以与Tb3 +的氧化与Tb4 +的氧化有关。<评论>上标/下标的摘要在1mol％的掺杂水平，通过溶胶 - 凝胶燃烧技术合成Tb3 +掺杂CaAL2O4（Tb掺杂CaA12O4）纳米晶体。为AS制备的TB掺杂CAAL2O4记录绿色余辉。通过X射线衍射法，扫描电子显微镜，透射电子显微镜，光致发光光谱，余辉光谱和热致发光剂量测定，研究了随后的退火对Tb掺杂CaAL2O4的绿色余辉的影响。发现Tb掺杂CaAL2O4的余辉的强度和持续时间都发现，当退火温度低于600Ω·C时，随着退火温度的增加而降低。 Tb掺杂CaAL2O4的余辉完全淬火，因为退火温度超过700℃。结合退火温度依赖性光致发光和Tb掺杂CaAL2O4的热致发光，我们的结果表明，在高退火温度下，余辉的降解可以与Tb3 +的氧化成连接到Tb4 +。

Annealing temperature dependent afterglow of Tb~(3+) doped CaAl_2O_4

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