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首页> 外文期刊>RSC Advances >Mechanoluminescence and thermoluminescence characterization of Tb3+ doped CaAl2O4: a theoretical and experimental study
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Mechanoluminescence and thermoluminescence characterization of Tb3+ doped CaAl2O4: a theoretical and experimental study

机译：Tb3 +掺杂CaAl2O4的机械发光和热致发光表征：理论和实验研究

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摘要

Mechanoluminescence and thermoluminescence of Tb in CaAl2O4 prepared by a solution combustion method has been reported. Phase purity, formation of a phosphor and surface morphology were confirmed by XRD and SEM techniques. The resulting phosphors were characterized by photoluminescence (PL) to detect incorporation of the dopant. When a gamma-irradiated Tb-doped CaAl2O4 crystal is impulsively deformed, two peaks appear in the ML intensity versus time curve, whereby the first ML peak is found in the deformation region and the second in the post deformation region of the crystals. The energy levels and hence trapping and detrapping mechanism of charge carriers can be explained using ML. The Tb-doped CaAl2O4 phosphor can be used in the dosimetric applications for ionizing radiation. The TL characteristics of CaAl2O4 may be useful for high radiation doses. Thermoluminescence (TL) materials have wide applications in the dosimetry of ionizing radiation, scintillators, X-ray laser materials, etc. The samples were irradiated using a Co-60 gamma-ray source at a dose of 0.930 kGy h(-1) and the heating rate used for TL measurements was 5 degrees C s(-1). The samples show good TL peaks for 0.2 mol% (urea), 0.2 mol% (hydrazine) and 0.2 mol% (carbohydrazide) doping concentrations of Tb3+ ions. We also report a more detailed theoretical understanding of the mechanism of TL and ML. All TL glow curves obey the second-order kinetics with a single glow peak, which reveals that only one set of trapping parameters is set for a particular temperature. The TL sensitivity was found to depend upon the annealing temperature and Tb3+ doping concentration. The prepared sample may be useful in TL dosimetry.
机译：已经报道了通过溶液燃烧法制备的CaAl2O4中Tb的机械发光和热致发光。通过XRD和SEM技术证实了相纯度，磷光体的形成和表面形态。通过光致发光（PL）表征所得的磷光体，以检测掺杂剂的掺入。当γ射线辐照的掺Tb的CaAl2O4晶体发生脉冲形变时，ML强度与时间的关系曲线出现两个峰，从而第一个ML峰出现在晶体的变形区域，第二个出现在晶体的变形后区域。可以使用ML解释电荷载流子的能级以及由此的俘获和去俘获机理。掺T的CaAl2O4荧光粉可用于剂量学应用中以电离辐射。 CaAl2O4的TL特性可能对高辐射剂量有用。热发光（TL）材料在电离辐射，闪烁体，X射线激光材料等的剂量测定中具有广泛的应用。使用Co-60γ射线源以0.930 kGy h（-1）的剂量辐照样品，并且用于TL测量的加热速率为5℃s（-1）。对于Tb3 +离子的掺杂浓度为0.2摩尔％（尿素），0.2摩尔％（肼）和0.2摩尔％（碳酰肼），样品显示出良好的TL峰。我们还报告了对TL和ML机理的更详细的理论理解。所有TL辉光曲线均具有一个辉光峰，服从二级动力学，这表明针对特定温度仅设置了一组捕获参数。发现TL灵敏度取决于退火温度和Tb3 +掺杂浓度。制备的样品可用于TL剂量测定。

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