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(a) The maximum phosphorescence intensity monitored at 545 nm under excitation of 276 nm for the uncoated cubic (solid line, open circles) from ref 8, uncoated monoclinic (broken line, open triangles), and SiO2-coated monoclinic (dotted line, filled triangles) nanoparticles as a function of Tb content. (b) Photoluminescence emission intensity decay curves of as-prepared, uncoated (open triangles), and SiO2-coated (filled triangles) Y2O3:Tb3+ (2 at % Tb) nanophosphors.
