Structural and spectral investigation of a near-UV-converted LiSrP3O9:Dy3+ phosphor for white light-emitting diodes

A near-UV-converted Dy3+ doped LiSrP3O9 phosphors were synthesized using a combustion synthesis route and were explored for the use as an n-UV-based white light-emitting diode. The powder diffraction pattern of the synthesized material confirms the formation of the triclinic phase of LiSrP3O9. Due to the 4f-4f transition of the Dy3+ ion, the excitation spectra of the phosphor consist of strong and narrow peaks in the UV and n-UV region. The PL emission spectra of the phosphor show three characteristic emission bands centered at 476 nm (blue), 570 nm (yellow), and 657 nm (red) corresponding to the transitions 4f-4f transition of the Dy3+. The multipole interaction was found to be the reason for the energy transfer between the Dy3+ ions after 2 mol% doping. The Commission International de l'Eclairage diagram coordinates (x = 0.35 and y = 0.40) fall inside the yellowish-white region, which is close to the white light.