1.2 Synthesis of SMSED luminescent

1.2 Synthesis of SMSED luminescent materials
The SMSED phosphors with long-lasting afterglow were synthesized by solid-state reaction method. Firstly, ac- cording to Sr1.93MgSi2O7:Eu2+0.03,Dy3+0.04, stoichiometric composition of SrCO3, 4MgCO3·Mg(OH)2·5H2O, SiO2, Eu2O3, and Dy2O3 were mixed and milled thoroughly in a planetary high-energy ball mill for 2–4 h. 10 mol.% of H3BO3 was added as a flux. Then, the well-mixed pow- ders were sintered at 1300 °C for 4 h with a weak reduc- ing atmosphere. The heating velocity of sintering furnace was 10 °C/min; and the cooling was furnace cooling. Fi- nally, the sintered products were re-milled and sieved to get the SMSED phosphor samples for spinning applica- tion.