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. 2017 Dec 11;7:17325. doi: 10.1038/s41598-017-17567-9

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© The Author(s) 2017

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Emission spectra under electron beam excitation. CL spectra (a) of undoped Y₂O₃ thin film at RT and at 77 K and (b) of Bi doped Y₂O₃ thin film at RT under electron beam excitation at 3 keV and 5 nA. The intensities reported in the two panels are directly comparable. Figure 4 (b) reports also the PL emission spectra from Bi ions in the two sites from the same sample at RT.

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