Comparative study on photoluminescence efficiencies of Sm~(3+)-doped MeWO_4 (Me = Ba, Sr, Ca, and Mg) phosphors

摘要

The Sm-doped MeWO_4 (Me = Ba, Sr, Ca, and Mg) phosphors were synthesized with a sol-gel method and studied for their microstructures and photoluminescence efficiencies. The hosts of the phosphors show very weak blue emissions except for the MgWO_4. The Sm~(3+) cation in the all hosts shows red emissions. Significantly, the photoluminescence efficiency of Sm~(3+) in CaWO_4 and BaWO_4 was largest as the calcination temperature equals 600 and 700 ℃, respectively. The BaWO_4 may be a new potential host of rare earth-doped phosphors.