Luminescent properties of La2LiTaO6:Mn4+ and its application as red emission LEDs phosphor

A novel phosphor, Mn4+ doped La2LiTaO6, was developed by solid-state reaction method. The luminescent spectra and emission efficiencies of La2LiTaO6:-Mn-x(4+) (x = 0.001, 0.003, 0.005 and 0.01) were discussed. The effects of co-doped charge compensation ions, M = Mg2+, Ca2+, Na+, were investigated, respectively. The excitation spectra indicated that La2LiTaO6:Mn4+ could be effectively excited by both NUV light and blue light. The emission spectra of the phosphor exhibit a broadband ranging from 670 to 720 nm with the maximum at about 709 nm in deep red region. The co-doping of Mg2+ could significantly improve the luminescent properties of La2LiTaO6:Mn4+. Thus, phosphor La2LiTaO6:-Mn4+, Mg2+ can serve as a key component to improve color rendering of blue-chip white-LEDs.