Photoluminescence properties of Eu3+ doped CaSr(WO4)2 phosphor by Li+ charge compensation

A series of CaSr(WO4)2: Eu3+ and CaSr(WO4)2: Eu3+, Li+ phosphors with different Eu3+ or Eu3+/Li+ molar contents were successfully synthesized by high-temperature solid-state reaction. Through a series of characterization methods, the composition, structure and luminescence characteristics of the sample are obtained. Upon excitation at 393 nm, the strong red light corresponding to the 5D0 → 7F2 transition of Eu3+ can be observed. The effect of Li+ charge compensation on the photoluminescence of the sample is studied. The strongest red emission is obtained through 1% Eu3+ and 1% Li+ doping. All of the results indicate that Li+ charge compensation can effectively enhance the red emissions intensity of Eu3+-doped CaSr(WO4)2 phosphors.