ORALS

SESSION: SolidStateChemistryTuePM1-R6	Alario-Franco international Symposium (2nd Intl Symp on Solid State Chemistry for Applications & Sustainable Development)
Tue. 29 Nov. 2022 / Room: Andaman 1
Session Chairs: Hiroshi Kageyama; Session Monitor: TBA

14:25: [SolidStateChemistryTuePM106] OS
LUMINESCENCE THERMOMETRY BASED ON NEAR-INFRARED EMISSION OF Yb3+,Er3+:YAG
Zeljka Antic¹ ; Jovana Periša² ; Aleksandar Ćirić³ ; Mina Medic² ; Ivana Zeković² ; Miroslav Dramicanin² ; Sanja Kuzman² ; ¹Vinca Institute of Nuclear Sciences, University of Belgrade, Belgrade, Serbia and Montenegro; ²University of Belgrade, Vinca Institute of Nuclear Sciences, Belgrade, Serbia and Montenegro; ³Vinča Institute of Nuclear Sciences, Knjaževac, Serbia and Montenegro;
Paper Id: 62 [Abstract]

<p>Temperature plays an essential role in biological systems, affecting a variety of their properties. For example, the cell division rate, and consequently tissue growth, are both critically influenced by temperature. The precise measurement of temperature is needed for both early diagnosis and treatment of malignant diseases. Nowadays, luminescence thermometry is considered to be a promising tool for non-invasive bio-thermal-imaging [1]. For such use, the biocompatible and near-infrared-emitting nanoparticles showing the strong temperature dependence of emission are urgently needed. Working within a near-infrared spectral region (the first and second biological windows) overcomes small light penetration lengths occurring with visible-emitting nanoparticles since in biological windows the extinction coefficient of tissues is low due to a simultaneous reduction in both tissue scattering and absorption coefficients [2]. Herein, well-known Yb3+,Er3+-doped yttrium aluminium garnet (YAG) nanopowder is prepared by the combustion method. The cubic structure of the material was confirmed by X-ray diffraction measurements, while UV-Vis-NIR diffuse reflectance showed typical Yb3+/Er3+ absorption bands. We have investigated the temperature dependence of near-infrared emission of the phosphor aiming to compare the thermometric performances of two different read-outs: i) changes in the intensities of emission bands and ii) changes in the emission bands position and bandwidths. Temperature dependant near-infrared emission spectra were measured in the 1000-1550 nm spectral range upon 980 nm excitation. Following combinations were investigated: i) luminescence intensity ratio of 1470/1530 nm Er3+ emission lines; ii) luminescence intensity ratio of 1030 nm Yb3+ and two Er3+ emission lines (1470 and 1530 nm); iii) Yb3+ emission band position and iv) Yb3+ emission bandwidth (FWHM). Among investigated read-out approaches, the most important figures of merit, absolute and relative sensitivities, and temperature resolutions have been calculated and compared.</p>

References:
<p>[1] M. D. Dramićanin, Luminescence Thermometry, Imprint Woodhead Publishing, Elsevier Science: Cambridge, United Kingdom (2018) [2] B. del Rosal, A. P&eacute;rez-Delgado, M. Misiak, A. Bednarkiewicz, A. S. Vanetsev, Y. Orlovskii, D. J. Jovanović, M. D. Dramićanin, U. Rocha, K. Upendra Kumar, C. Jacinto, E. Navarro, E. Mart&iacute;n Rodr&iacute;guez, M. Pedroni, A. Speghini, G. A. Hirata, I. R. Mart&iacute;n, D. Jaque, J. Appl. Phys., 118 (2015) 143104 (11p).</p>

SESSION: SolidStateChemistryTuePM2-R6	Alario-Franco international Symposium (2nd Intl Symp on Solid State Chemistry for Applications & Sustainable Development)
Tue. 29 Nov. 2022 / Room: Andaman 1
Session Chairs: Miguel Angel Alario Franco; Session Monitor: TBA

15:55: [SolidStateChemistryTuePM209] OS
Highly-sensitive Luminescence Thermometry of Sm2+ doped in Al2O3 Coatings
Aleksandar Ćirić¹ ; Zoran Ristic² ; Zeljka Antic³ ; Ivana Zeković² ; Stevan Stojadinović⁴ ; Mikhail G. Brik⁵ ; Miroslav Dramicanin² ; ¹Vinča Institute of Nuclear Sciences, Knjaževac, Serbia and Montenegro; ²University of Belgrade, Vinca Institute of Nuclear Sciences, Belgrade, Serbia and Montenegro; ³Vinca Institute of Nuclear Sciences, University of Belgrade, Belgrade, Serbia and Montenegro; ⁴University of Belgrade, Faculty of Physics, Belgrade, Serbia and Montenegro; ⁵Institute of Physics, University of Tartu,, Tartu 50411, Estonia;
Paper Id: 64 [Abstract]

<p><strong>Summary </strong> &gamma;-Al-2O3:Sm²⁺ coatings were synthesized by the plasma electrolytic oxidation (PEO). The emissions originate from 4f⁵5d¹&rarr;4f⁶ and 4f⁶&rarr;4f⁶ transitions of Sm²⁺. The emission spectra, recorded from 300 K to 673 K, reveled the rapid diminution of the ⁵D₀&rarr;⁷F_J transitions with increasing temperature. The 5d&rarr;4f broad-band emission increases in intensity up to 225 &deg;C. The high-luminescence intensities and opposite intensity vs temperature trends of these emissions are an indication of the high sensitivities and low temperature resolution. The luminescence intensity ratio (LIR) are well-fitted to the Boltzmann distribution and the energy-crossover model with relative sensitivities: 3.5 %K-1 @ 300 K and 1.5 %K-1 @ 540 K. <strong>Introduction</strong> Sm2+ has a wide excitation band [1]. The emission spectrum of Sm²⁺ features a broad-band due to 5d-4f transition and a series of sharp peaks due to 4f-4f transitions. The discovery of Al₂O₃:Sm²⁺ [1] provided an opportunity for the investigation of this material as temperature sensor. The indications of its high potential for the phosphor thermometry were the existence of both the 5d-4f and 4f-4f emissions, high emission intensities, wide choice of excitation wavelengths, and the sole importance of the substrate material itself. The significant overlap of 5d with ⁵D₀ level is an indication of the highly efficient f-f transitions [2]. The complete thermometric analysis was carried out. <strong>Methods</strong> 99.9% pure aluminium, 6061 and 7075 aluminium alloys were used as anode during the PEO. XRD was used for investigation of the coating crystallinity. High-stability 473 nm laser was used as an excitation source. The beams were transferred via a fiber-optic bundle. Emission spectra were recorded by the high-resolution spectrograph. The samples were placed on the liquid nitrogen cooled hot/cold stage. <strong>Results</strong> Emission spectra for LIR and LT were recorded from 100 K to 673 K. The ⁵D₀&rarr;⁷F_J emissions rapidly drop with increasing temperature, while the 4f-5d increases up to 225 &deg;C. LIR is estimated from the ratio of 5d-4f and 4f-4f transitions, giving the excellent relative sensitivity values. Luminescence lifetime of ⁵D₀&rarr;⁷F₀ is fitted to the energy crossover model [3], with maximum relative sensitivity 1.5 %K-1 @ 540 K. <strong>Conclusions</strong> A steady-state and time-resolved thermometry on a wide temperature range was carried out on the highly luminescent phosphor incorporated in the coatings of possibly the most important industrial material. LIR following Boltzmann distribution showed sensitivity among the highest ever recorded. The lifetime rapidly drops with increasing temperature.</p>

References:
<p>[1] S. Stojadinović, N. Tadić, R. Vasilić, Photoluminescence of Sm2+ / Sm3+ doped Al2O3 coatings formed by plasma electrolytic oxidation of aluminum, J. Lumin. 192 (2017) 110&ndash;116. https://doi.org/10.1016/j.jlumin.2017.06.043. [2] M. Tanaka, T. Kushida, Interference between Judd-Ofelt and Wybourne-Downer mechanisms in the 5D0-7FJ (J=2,4) transitions of Sm2+ in solids, Phys. Rev. B. 53 (1996) 588&ndash;593. https://doi.org/10.1103/PhysRevB.53.588. [3] M. Sekulić, Z. Ristić, B. Milićević, Ž. Antić, V. Đorđević, M.D. Dramićanin, Li1.8Na0.2TiO3:Mn4+: The highly sensitive probe for the low-temperature lifetime-based luminescence thermometry, Opt. Commun. 452 (2019) 342&ndash;346. https://doi.org/10.1016/j.optcom.2019.07.056.</p>