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(a) Emission spectra of the Y0.97−xTb0.03Eux ternary oxides under 278 nm excitation for x = 0, 0.005, 0.01, 0.02 and 0.03 (curves (a)–(e), respectively). Curve (f) corresponds to the Y0.995Eu0.005 oxide and is included for comparison. The right part shows luminescence of the x = 0 and 0.10 samples under 254 nm excitation from a hand-held UV lamp. (b) Intensities of the 543 and 613 nm emissions normalized to 10, and the I613/I543 intensity ratio versus Eu content (the x value).
