Browsing by Author "Arslanlar Y.T."
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Item Radioluminescence properties of copper-and terbium-implanted strontium titanate(2013) Arslanlar Y.T.; Kibar R.; Çetin A.; Canmoǧlu A.In this study, the effects of Cu and Tb implantation on the radioluminescence (RL) properties of unimplanted and Cu-and Tb-implanted SrTiO3 (STO) crystals were investigated. The changes induced by heavy ion implants of the surface clearly modify the initial strong RL signals seen near 400-750 nm. During heating there are step increases in intensity at the RL spectrum near 60, 40, and 82 K for unimplanted and Cu-and Tb-implanted samples, respectively. © 2013 Taylor and Francis Group, LLC.Item Determination of thermoluminescence kinetic parameters of white and blue chalcedony exposed to X-ray irradiation(Elsevier Ltd, 2018) Keskin İ.Ç.; Katı M.İ.; Türemiş M.; Çetin A.; Arslanlar Y.T.; Kibar R.The study reveals the thermoluminescence (TL) properties of white and blue chalcedony minerals which this mineral mined two different regions (Edirne and Eskişehir, respectively) of Turkey. With the help of various characterization techniques (such as X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FT-IR)), the gem-quality of the samples was tested. The TL glow curves of the samples irradiated with X-rays show intense main TL glow peak having the maximum temperatures at 100 °C and 121 °C with a heating rate of 2 °C/s, respectively. The TL kinetic parameters of the samples are reported here for the first time. Activation energy (E), frequency factor (s) and the order of kinetics (b) of these peaks have been determined in detail by using various heating rates (VHR) and peak shape (PS) methods and verified by Computerized Glow Curve Deconvolution (CGCD). The CGCD method was used to determine the number of peaks associated with the TL glow curves. The values of E calculated with these three methods are a good agreement. © 2018 Elsevier LtdItem Structural and thermal insights into the luminescent behavior of Dy³⁺-Doped BaZrO₃ with alkali metal codopants under UV radiation(Elsevier Ltd, 2025) Arslanlar Y.T.; Alajlani Y.; Coban M.B.; Kaynar U.H.; Aydin H.; Örücü H.; Guinea J.G.; Can N.This study investigates the structural, thermal, and photoluminescent properties of Dy³⁺-doped BaZrO₃ (BZO) perovskites, synthesized via a co-precipitation method, incorporating alkali metal codopants (Li⁺, Na⁺, and K⁺). X-ray diffraction (XRD) analysis confirmed the retention of the cubic perovskite phase following doping, with Rietveld refinement further revealing minor lattice distortions due to Dy³⁺ incorporation. The Williamson-Hall (W–H) analysis revealed average crystallite sizes of 53 nm and 66 nm for undoped and 0.01 Dy³⁺-doped BaZrO₃, respectively, with corresponding micro-strain values of 1.79 × 10⁻³ and 1.81 × 10⁻³, suggesting lattice distortions due to incorporation of Dy³⁺. Fourier transform infrared (FTIR) spectroscopy confirmed the cubic perovskite structure and subtle structural modifications upon doping. Notably, the absence of moisture-related peaks highlights the effectiveness of the synthesis process, including rigorous drying and calcination steps that prevented hydrous species. Photoluminescence (PL) analysis of Dy³⁺-doped BaZrO₃ exhibited three prominent emission peaks at 452 nm, 573 nm, and 656 nm under 368 nm excitation. These peaks correspond to the characteristic intra-4f electronic transitions of Dy³⁺ ions, specifically, 4I13/2 to 6H15/2, 4F9/2 to 6H13/2, and 4F9/2 to 6H11/2, representing blue, yellow, and red emissions, respectively. Photoluminescence decay studies showed multi-exponential behavior, with the average lifetime decreasing from 641 μs in undoped BZO to 492 μs in Dy³⁺-doped samples attributed to enhanced non-radiative recombination pathways. Among the codopants, Li⁺ demonstrated the most significant improvement in luminescence intensity and thermal stability by mitigating defects and optimizing charge compensation. © 2025 Elsevier LtdItem Thermoluminescence response and kinetic parameters of Tb-doped GdCa4O(BO3)3 under beta irradiation(Elsevier Ltd, 2025) Alajlani Y.; Bulcar K.; Oglakci M.; Kaynar U.H.; Arslanlar Y.T.; Topaksu M.; Correcher V.; Can N.In this study, the thermoluminescence (TL) properties of Tb3+-doped GdCa4O(BO3)3 (GdCOB) are investigated with focus on the effects of optical filter selection, preheating, dopant concentration, irradiation dose, heating rate on these properties. Trapping parameters of the traps responsible for the peaks in the phosphor were also determined. The IRSL-TL-565 nm filter was identified as optimal filter for isolating the characteristic green emission of Tb3+ and improving the signal-to-noise ratio. Among the studied dopant concentrations (1, 2, 3, 5, and 7 wt%), 3 wt% Tb3+ was found to maximize TL intensity. Beyond this concentration, quenching effects became dominant, leading to reduced TL efficiency. At 3 wt% doping, TL glow peaks were observed at approximately 80 and 190 °C following a 50 Gy beta dose with a heating rate of 2 °C/s, with the primary peak (∼190 °C) favorable for minimizing thermal fading. The TL response of the primary peak was linear with dose within 5–500 Gy. The peak's TL intensity is affected by thermal quenching effects. Reusing of an aliquot of the phosphor ten times produced responses with 0.45 % maximum deviation from their mean. Additionally, the peak temperature (Tm) exhibited a slight decrease beyond 100 Gy, which can be attributed to charge carrier interactions, trap filling effects, and potential thermal quenching at higher doses. Heating rate experiments showed the expected shift of peak temperatures to higher values, emphasizing the need to correct for temperature lag in kinetic analyses. Computerized glow curve deconvolution (CGCD) indicated the presence of at least eight distinct trapping levels with activation energies ranging from 0.90 to 1.69 eV, revealing a complex trap structure. Overall, with its high TL intensity, linear dose response, and aliquot reusability, Tb3+-doped GdCOB is a promising phosphor for personal dosimetry, environmental radiation monitoring, and medical imaging. © 2025 Elsevier Ltd