Energy transfer between activators at different crystallographic sites in Sr3SiO5:Eu2+

A yellow phosphor, Sr3SiO5:Eu2+, was synthesized by a high temperature solid-state method. Sr3SiO5:Eu2+ exhibits a single yellow emission under the blue radiation excitation. However, Sr3SiO5:Eu2+ shows a two-peak emission under the ultraviolet radiation excitation when Eu2+ doping content is less than 0.01 mol. Moreover, the blue emission disappears and the yellow emission reaches the peak value when Eu2+ doping content is 0.01 mol. Namely, the energy transfer takes place between the Eu2+ activators, which is located at two different crystallographic sites in the Sr3SiO5. And the energy transfer mechanism is the dipole-dipole interaction.