Correlation between gamma radiation induced trap parameters and dosimetric properties of Ce-doped Ca2B2O5 phosphor

IF 3.6 3区 物理与天体物理 Q2 OPTICS
Yogeshri G. Bagekari , Kishor H. Gavhane , Preeti P. Kulkarni , Akash P. Jadhav , Sandhya B. Deshmukh , Mahesh S. Bhadane , Shailendra S. Dahiwale , Sanjay D. Dhole
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Abstract

This study investigates the structural, morphological, photoluminescence, and thermoluminescence dosimetric properties of Ce-doped Ca2B2O5 phosphors. The crystalline structure of the synthesized phosphor powder was determined using powder X-ray diffraction (PXRD), confirming a monoclinic structure. Scanning electron microscopy (SEM) revealed an irregular morphology with a non-uniform size distribution having an average particle size of approximately 0.75μm. Fourier transform infrared (FTIR) spectroscopy identified the presence of B–O stretching vibrations and other functional groups, which confirms the material's composition. Photoluminescence (PL) studies demonstrated intense blue luminescence, attributed to the 5d→4f transitions of Ce3+ ions. Thermoluminescence (TL) glow curve optimization was conducted by varying Ce3+ concentrations in Ca2B2O5 phosphor samples. The optimized Ce-doped Ca2B2O5 (1.5 mol % Ce) exhibited a single TL peak at 259 °C, indicative of deeper level traps. The linear dose-response of Ca2B2O5:1.5 mol % Ce3+ phosphor was analyzed, revealing a linearity fit curve with a regression coefficient (R2) value of 0.98 across a dose range from 0.5 Gy to 850 Gy. Experimental TL glow curve studies using the Tm–Tstop and Initial Rise Method (IRM) techniques identified five distinct trapping levels, with activation energies 0.9 eV, 1 eV, 1.27 eV, 1.43 eV, and 1.6 eV. These findings suggest that Ce-doped Ca2B2O5 phosphors have potential applications in various luminescent devices and in radiation dosimetry.
ce掺杂Ca2B2O5荧光粉γ辐射诱导阱参数与剂量学性质的关系
本研究研究了ce掺杂Ca2B2O5荧光粉的结构、形态、光致发光和热致发光剂量学性质。利用粉末x射线衍射(PXRD)测定了合成的荧光粉的晶体结构,证实其为单斜晶型结构。扫描电子显微镜(SEM)观察到其形貌不规则,粒径分布不均匀,平均粒径约为0.75μm。傅里叶变换红外光谱(FTIR)鉴定出B-O拉伸振动和其他官能团的存在,这证实了材料的成分。光致发光(PL)研究显示出强烈的蓝色发光,归因于Ce3+离子的5d→4f跃迁。通过改变Ca2B2O5荧光粉样品中Ce3+的浓度,对热释光(TL)曲线进行了优化。优化后的Ce掺杂Ca2B2O5 (1.5 mol % Ce)在259°C时呈现出单个TL峰,表明存在更深能级的陷阱。分析了Ca2B2O5:1.5 mol % Ce3+荧光粉在0.5 ~ 850 Gy剂量范围内的线性剂量响应,回归系数R2为0.98。利用Tm-Tstop和初始上升法(IRM)技术进行的TL辉光曲线实验研究确定了5个不同的捕获能级,活化能分别为0.9 eV、1 eV、1.27 eV、1.43 eV和1.6 eV。这些发现表明ce掺杂Ca2B2O5荧光粉在各种发光器件和辐射剂量学中具有潜在的应用前景。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Journal of Luminescence
Journal of Luminescence 物理-光学
CiteScore
6.70
自引率
13.90%
发文量
850
审稿时长
3.8 months
期刊介绍: The purpose of the Journal of Luminescence is to provide a means of communication between scientists in different disciplines who share a common interest in the electronic excited states of molecular, ionic and covalent systems, whether crystalline, amorphous, or liquid. We invite original papers and reviews on such subjects as: exciton and polariton dynamics, dynamics of localized excited states, energy and charge transport in ordered and disordered systems, radiative and non-radiative recombination, relaxation processes, vibronic interactions in electronic excited states, photochemistry in condensed systems, excited state resonance, double resonance, spin dynamics, selective excitation spectroscopy, hole burning, coherent processes in excited states, (e.g. coherent optical transients, photon echoes, transient gratings), multiphoton processes, optical bistability, photochromism, and new techniques for the study of excited states. This list is not intended to be exhaustive. Papers in the traditional areas of optical spectroscopy (absorption, MCD, luminescence, Raman scattering) are welcome. Papers on applications (phosphors, scintillators, electro- and cathodo-luminescence, radiography, bioimaging, solar energy, energy conversion, etc.) are also welcome if they present results of scientific, rather than only technological interest. However, papers containing purely theoretical results, not related to phenomena in the excited states, as well as papers using luminescence spectroscopy to perform routine analytical chemistry or biochemistry procedures, are outside the scope of the journal. Some exceptions will be possible at the discretion of the editors.
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