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(a) Photoluminescence spectra and (b) interpolated PL intensity map of the EuOx films obtained under UV (355 nm) laser excitation. (c) The filled color of each graph represents the color emission established by the Commission Internationale de l’Éclairage (CIE) in 1931, known as the CIE 1931. (b) CIE 1931 x-y color matching functions for the corresponding EuOx thin films.
