| High sensitivity temperature probing of Mn4+ doped Li4Ti5O12 by lifetime-based luminescence thermometry Zoran Ristic1; Mina Medic1; Vesna Djordjevic1; Sanja Kuzman1; Mikhail G. Brik2; Miroslav Dramicanin1; 1UNIVERSITY OF BELGRADE, VINCA INSTITUTE OF NUCLEAR SCIENCES, Belgrade, Serbia and Montenegro; 2INSTITUTE OF PHYSICS, UNIVERSITY OF TARTU,, Tartu 50411, Estonia; PAPER: 63/SolidStateChemistry/Regular (Oral) SCHEDULED: 14:00/Tue. 29 Nov. 2022/Andaman 1 ABSTRACT: <p>In this work we utilise luminescent properties of Mn<sup>4+</sup> doped Li<sub>4</sub>Ti<sub>5</sub>O<sub>12</sub> - a very promising material for ultrafast-charge-discharge and long-cycle-life batteries [1]. Applying lifetime-based luminescence thermometry on Mn<sup>4+</sup> doped materials the remote and non-contact temperature readings are possible with great relative sensitivity [2-4].<br />The Mn<sup>4+</sup> doped Li<sub>4</sub>Ti<sub>5</sub>O<sub>12</sub> samples were prepared by the one step solid-state method using stoichiometric amounts of Li<sub>2</sub>CO<sub>3</sub>, TiO<sub>2</sub> and MnO<sub>2</sub> at 850 <sup>o</sup>C to obtain cubic spinel structure with space group Fd-3m as confirmed by X-ray diffraction analysis. In this host, Mn<sup>4+</sup> is in a strong crystal field providing the strong absorption around 500 nm due to <sup>4</sup>A<sub>2g</sub> →<sup>4</sup>T<sub>2g</sub> electric spin-allowed electron transition and with emission around 679 nm on account of <sup>2</sup>E<sub>g</sub> →<sup>4</sup>A<sub>2g</sub> spin forbidden electron transition. Due to the coupling to phonon modes of the host material [5] the change of radiative decay rate (radiative lifetime) starts at very low temperatures (»75 K). In addition, the low value of energy of <sup>4</sup>T<sub>2g</sub> level (20000 cm−1) leads to the strong emission and radiative lifetime quenching starting at low temperatures (»250 K) which favours the use of this material for the luminescence thermometry in a broad temperature range. <br />Temperature dependences of photo-luminescent emission spectra and emission decay are measured over the 10–350 K range exhibiting quite large value of relative sensitivity (2.6% K−1@330 K) that facilitates temperature measurements with temperature resolution better than 0.15 K around room temperature.</p> References: <p>[1] Bote Zhao, Ran Ran, Meilin Liu, Zongping Shao ; A comprehensive review of Li4Ti5O12-based electrodes for lithium-ion batteries: The latest advancements and future perspectives ; Materials Science and Engineering: R: Reports,Volume 98,Pages 1-71, 2015<br />[2] Sekulić, M., Ristic, Z., Milićević, B., Antić, Ž., Đorđević, V., & Dramićanin, M. D. (2019). Li1.8Na0.2TiO3:Mn4+: The highly sensitive probe for the low-temperature lifetime-based luminescence thermometry. Optics Communications, 452, 342–346.<br />[3] Li F., Cai J., Chi F.F., Chen Y., Duan C., Yin M.Investigation of luminescence from luag: Mn4+ for physiological temperature sensing, Opt. Mater., 66 (2017), pp. 447-452,<br />[4]Glais E., Đorđević V., Papan J., Viana B., Dramićanin M.D.MgTiO3:Mn4+ a multi-reading temperature nanoprobe, RSC Adv., 8 (2018), pp. 18341-18346,<br />[5] Senden T., van Dijk-Moes R.J.A., Meijerink A. Quenching of the red Mn4+ luminescence in Mn4+-doped fluoride LED phosphors, Light Sci. Appl., 7 (2018), p. 8</p> |
