Abstract
Manganese is capable of exist in many oxidation states from +1 to +7. In research of phosphors especially attractive and intensively studied in last years is a d-d emissions from Mn2+ and Mn4+. In both cases the luminescence may appear in red spectral range, greatly attractive for WLEDs.1 Yet, being strongly dependent on the host lattice the Mn2+ emission can vary from green to deep red with decay time in the order of ms. This presentation is devoted to Mn2+ emission in cubic Lu2O3 host lattice which offer two nonequivalent site symmetry, C2 and C3i, for the dopant ion.2 A successful technology of effective permanent stabilization of Mn2+ in this host will be presented. The preliminary spectroscopic investigation showed that the title system is able to produce thermoluminescence after irradiation with X-rays or UV-rays. Furthermore, in PL measurements detected in wide temperature range the system is able to produce 2 or even 3 different emissions whose intensities change in a complex way. These observations tells to consider the possible usefulness of the system to serve as a prospective luminescence thermometer working over a broad range of temperatures. This research was supported by Polish National Science Centre upon the grant #UMO-2017/25/B/ST5/00824. Q. Zhou, L. Dolgov, A. M. Srivastava, L. Zhou, Z. Wang, J. Shi, M. D. Dramićanin, M. G. Brik and M. Wu, Mn2+ and Mn4+ red phosphors: Synthesis, luminescence and applications in WLEDs. A review, J. Mater. Chem. C, 2018, 6, 2652–2671. E. Zych, Concentration Dependence of Energy Transfer between Eu3+ ions occupying two symmetry sites in Lu2O3, J. Phys. Condens. Matter, 2002, 14, 5637–5650.
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