Dubey Vikas, Kaur Jagjeet, Parganiha Yogita, Suryanarayana N S, Murthy K V R
Department of Physics, Bhilai Institute of Technology, Raipur, New Raipur 493661, India.
Department of Physics, Govt. Y.T.PG. Auto. College, Durg 491001, India.
Appl Radiat Isot. 2016 Apr;110:16-27. doi: 10.1016/j.apradiso.2015.12.047. Epub 2015 Dec 19.
This paper reports the thermoluminescence properties of Eu(3+) doped different host matrix phosphors (SrY2O4 and Y4Al2O9). The phosphor is prepared by high temperature solid state reaction method. The method is suitable for large scale production and fixed concentration of boric acid using as a flux. The prepared samples were characterized by X-ray diffraction technique and the crystallite size calculated by Scherer's formula. The prepared phosphor characterized by Scanning Electron Microscopic (SEM), Fourier Transform Infrared (FTIR), Energy Dispersive X-ray analysis (EDX), thermoluminescence (TL) and Transmission Electron Microscopic (TEM) techniques. The prepared phosphors for different concentration of Eu(3+) ions were examined by TL glow curve for UV, beta and gamma irradiation. The UV 254nm source used for UV irradiation, Sr(90) source was used for beta irradiation and Co(60) source used for gamma irradiation. SrY2O4:Eu(3+)and Y4Al2O9:Eu(3+) phosphors which shows both higher temperature peaks and lower temperature peaks for UV, beta and gamma irradiation. Here UV irradiated sample shows the formation of shallow trap (surface trapping) and the gamma irradiated sample shows the formation of deep trapping. The estimation of trap formation was evaluated by knowledge of trapping parameters. The trapping parameters such as activation energy, order of kinetics and frequency factor were calculated by peak shape method. Here most of the peak shows second order of kinetics. The effect of gamma, beta and UV exposure on TL studies was also examined and it shows linear response with dose which indicate that the samples may be useful for TL dosimetry. Formation of deep trapping mechanism by UV, beta and gamma irradiated Eu(3+) activated SrY2O4 and Y4Al2O9 phosphors is discussed in this paper.
本文报道了Eu(3+)掺杂不同基质磷光体（SrY2O4和Y4Al2O9）的热释光特性。磷光体通过高温固相反应法制备。该方法适用于大规模生产，并使用固定浓度的硼酸作为助熔剂。制备的样品通过X射线衍射技术进行表征，并根据谢乐公式计算微晶尺寸。制备的磷光体通过扫描电子显微镜（SEM）、傅里叶变换红外光谱（FTIR）、能量色散X射线分析（EDX）、热释光（TL）和透射电子显微镜（TEM）技术进行表征。通过TL发光曲线对不同浓度Eu(3+)离子的制备磷光体进行紫外、β和γ辐照检测。使用254nm紫外光源进行紫外辐照，使用Sr(90)源进行β辐照，使用Co(60)源进行γ辐照。SrY2O4:Eu(3+)和Y4Al2O9:Eu(3+)磷光体在紫外、β和γ辐照下均显示出高温峰和低温峰。此处，紫外辐照样品显示出浅陷阱（表面俘获）的形成，而γ辐照样品显示出深俘获的形成。通过俘获参数的知识对陷阱形成进行评估。通过峰形法计算俘获参数，如活化能、动力学级数和频率因子。此处大多数峰显示为二级动力学。还研究了γ、β和紫外暴露对TL研究的影响，结果表明其与剂量呈线性响应，这表明这些样品可能适用于TL剂量测定。本文讨论了紫外、β和γ辐照Eu(3+)激活的SrY2O4和Y4Al2O9磷光体形成深俘获机制的情况。
