Structural and spectral investigation of a near-UV-converted LiSrP 3 O 9 :Dy 3+ phosphor for white light-emitting diodes

A near-UV-converted Dy 3+ doped LiSrP 3 O 9 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 LiSrP 3 O 9 . Due to the 4f–4f transition of the Dy 3+ 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 Dy 3+ . The multipole interaction was found to be the reason for the energy transfer between the Dy 3+ 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.