Luminescence investigations of Sr3SiO5:Eu2+ orange–yellow phosphor for UV-based white LED

Abstract

An orange–yellow phosphor, Sr3SiO5:Eu2+, was synthesized by a high energy ball milling method. Sr3SiO5:Eu2+ exhibits an orange–yellow emission under the blue radiation excitation. The excitation, emission spectra and lifetime decay curves of 4f65d1→4f7 of Eu2+ were measured and interpreted with respect to their crystal structures and multi-site occupations of divalent europium in the hosts. The blue emission disappears and the orange–yellow emission reaches the peak value when Eu2+ doping content is 0.003mol. 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. The results show that the Eu2+ doped powder phosphors containing Sr3SiO5 powder can be used as potential matrix materials for a high power white LED pumped by the UVLED chip.