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The excitation monitored at 545 nm (a, c) and emission under 276 nm excitation (b, d) spectra of the 2 at % Tb-doped Y2O3 uncoated monoclinic (a, b) and SiO2-coated monoclinic (c, d) nanoparticles for the different annealing temperatures (750, 850, 900, and 1100 °C). The phosphorescence intensity decreases for the transition from monoclinic to cubic crystal structure.
