Tamrakar Raunak Kumar, Upadhyay Kanchan, Bisen D P
Department of Applied Physics, Bhilai Institute of Technology (Seth Blakrishan Memorial), Durg (C.G.), 491001, India.
Phys Chem Chem Phys. 2017 Jun 7;19(22):14680-14694. doi: 10.1039/c7cp01424d.
Thermoluminescence property of a phosphor is an important parameter that helps to determine the use of a phosphor in various dosimetric applications. In this study, the thermoluminescence behaviour of a monoclinic GdO:Er;Yb nanophosphor was studied. GdO:Er;Yb nanophosphor was prepared using a combustion synthesis method. Structural characterization was carried out via X-ray diffraction and electron microscopy methods. Herein, thermoluminescence (TL) study and kinetic analysis of the UV- and gamma-irradiated phosphor was also carried out. The prepared phosphor exhibits two TL glow curves around 122 and 263 °C for UV excitation and 157 and 295 °C for gamma exposure. The effect of different parameters on the TL glow curve was investigated. The glow curve deconvolution function was applied on the tuned glow peak curve. The trapping parameters were determined for tuned glow curve peaks as well as for the deconvoluted peaks. Moreover, reproducibility of the sample was determined via 7 replicate TL measurements. The prepared sample shows good reproducibility for both UV and gamma exposure. A theoretical three trap and one recombination centre (3T1R) model was proposed to explain the concentration quenching effect on the thermoluminescence behaviour of the prepared sample.
磷光体的热释光特性是一个重要参数，有助于确定磷光体在各种剂量学应用中的用途。在本研究中，对单斜晶系GdO:Er;Yb纳米磷光体的热释光行为进行了研究。采用燃烧合成法制备了GdO:Er;Yb纳米磷光体。通过X射线衍射和电子显微镜方法进行结构表征。在此，还对紫外和γ辐照磷光体进行了热释光（TL）研究和动力学分析。制备的磷光体在紫外激发下于122和263℃左右呈现两条TL发光曲线，在γ辐照下于157和295℃左右呈现两条TL发光曲线。研究了不同参数对TL发光曲线的影响。将发光曲线反卷积函数应用于调谐后的发光峰曲线。确定了调谐发光曲线峰以及反卷积峰的俘获参数。此外，通过7次重复TL测量确定了样品的重现性。制备的样品在紫外和γ辐照下均显示出良好的重现性。提出了一个理论上的三陷阱一复合中心（3T1R）模型来解释浓度猝灭对制备样品热释光行为的影响。
