The photoluminescence properties of a blue phosphor—Eu2+ doped silicate lutetium strontium with triple sites

Eu2+ doped silicate lutetium strontium Sr3Lu2(Si3O9)2 (SLSO): m Eu2+ (m=0.01, 0.015, 0.02, 0.03, 0.04, 0.05, 0.06) phosphors have been synthesized by using solid-state reaction on 1350 ºC. We suppose there are three lattice sites, named Eu2+(I), Eu2+(II), and Eu2+(III) in SLSO: Eu2+, from the photoluminescence (PL) spectra and the decay curves. As Eu2+ concentration increases, energy transfer (ET) between Eu2+ ions appear, and the mechanism was dipole-dipole (d-d) interaction. Besides, temperature-dependent photoluminescence of SLSO: 0.015Eu2+ is investigated. The emission shifts blue with temperature rising. From the temperature-dependent emission, the activation energy, ∆E, is ∼0.289 eV. CIE coordinate is (0.16, 0.03) for SLSO: 0.015Eu2+. All those results show that SLSO: Eu2+, as a UV-LED blue phosphor, has possible application prospects.