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. 2019 Dec 23;13(1):93. doi: 10.3390/ma13010093

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© 2019 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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(a) Photoluminescence spectra measured from Y₂O_3−xS_x:Eu samples prepared using either process P2 or P3. The measurements were carried out at room temperature. Excitation wavelengths of 266 and 330 nm were used. (b) CIE 1931 chromaticity diagram for Y₂O_3−xS_x:Eu samples deduced from photoluminescence measurements in (a).