Figure 3From: A facile approach to synthesize SiO2 · Re2O3 (Re = Y, Eu, La, Sm, Tb, Pr) hollow sphere and its application in drug releaseThe emission spectrum of SiO 2 ∙Eu 2 O 3 HSs. The insert is digital image of SiO2∙Eu2O3 HSs under UV light.Back to article page