Luminescence and energy transfer properties of single-component Mg0.5Ti2(PO4)3:Dy3+, Eu3+ for warm white UV LEDs

Abstract Mg 0.5 Ti 2 (PO 4 ) 3 :Dy 3+ /Eu 3+ phosphors were prepared via solid-state reaction method under normal ambient air. The phosphors were characterized by X-ray, photoluminescence excitation and emission spectra. The XRD patterns showed that Dy 3+ and Eu 3+ could be effectively doped into the Mg 0.5 Ti 2 (PO 4 ) 3 host. The concentration quenching mechanism of Dy 3+ in the Mg 0.5 Ti 2 (PO 4 ) 3 host was proven to be dipole-dipole interaction. The emission intensity and the decay lifetime of Dy 3+ decreased with the increase of Eu 3+ concentration, which proved the existence of the energy transfer from Dy 3+ to Eu 3+ in the Mg 0.5 Ti 2 (PO 4 ) 3 host. It was found that the energy was transferred from 4 F 9/2 level of Dy 3+ to the 5 D 0 level of Eu 3+ by dipole-dipole interaction. Besides, the correlated color temperature is improved with the introduction of Eu 3+ ions. The experiment presents that Mg 0.5−x−y Ti 2 (PO 4 ) 3 :xDy 3+ , yEu 3+ phosphors are promising materials for warm white UV LEDs.