@article{Ragiń_Baranowska_Sołtys_Górny_Zmojda_Kochanowicz_Mikulski_Jadach_Dorosz_2018, title={Up-conversion luminescence in low phonon heavy metal oxide glass co-doped with Er3+/Ho3+}, volume={10}, url={https://www.photonics.pl/PLP/index.php/letters/article/view/10-2}, DOI={10.4302/plp.v10i1.802}, abstractNote={In this paper, heavy metal oxide glasses co-doped with erbium and holmium ions have been synthesized. Glass composition, based on the bismuth and germanium oxides, has been selected in terms of high thermal stability (delta T = 125 °C), high refractive index (n = 2.19) and low maximum phonon energy (h<em>v</em><sub>max</sub> = 724 cm<sup>-1</sup>). Up-conversion luminescence spectra under the 980 nm laser diode excitation have been observed as a result of radiative transitions within the quantum energy level structures of Er<sup>3+</sup> and Ho<sup>3+</sup> ions. Optimization of rare earth ions content has been conducted, the highest emission intensity in the visible wavelength range has been observed in glass co-doped with molar concentration 0.5 Er<sub>2</sub>O<sub>3</sub> / 0.5 Ho<sub>2</sub>O<sub>3</sub>. <br /> <br /> Full Text: <a class="file" href="/PLP/index.php/letters/article/view/10-2/518" target="_parent">PDF</a> <br /> <br /> <strong>References</strong><ol><li>F. Zhang, Z. Bi, A. Huang, Z. Xiao, "Visible luminescence properties of Er<sup>3+</sup>?Pr<sup>3+</sup> codoped fluorotellurite glasses", Opt. Materials 41, 112 (2014). <a class="file" href="https://doi.org/10.1016/j.optmat.2014.10.029" target="_parent"> CrossRef </a></li><li>S. Li, S. Ye, T. Liu, H. Wang, D. Wang, "Enhanced up-conversion emissions in ZnO-LiYbO<sub>2</sub>:RE<sup>3+</sup> (RE = Er or Ho) hybrid phosphors through surface modification", J. All. 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