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Photoluminescence spectra and crystallographic environments around Eu2+ ions of three series of nitride red phosphors using different raw materials (a) CASN:Eu2+@Eu2O3; (b) CASN:Eu2+@EuN; (c) CASN:Eu2+@EuB6; (d) EuN2IN2IIO; (e) EuN2IN3II and (f) EuN2IN2IIB phosphors with various content x (x = 0.01, 0.02, 0.03, 0.04, 0.06).
