Luminescence of Bi~3+ nd Eu~2+ double centers doped in CaS host

摘要

In this work, double-center-doped luminescent material CaS:Bi~3+, Eu~2+ was made via flux NH_4Cl by sintering in excess sulfur environment. The sample had a purplish red net luminescent Color. Excitation spectra at both red, 650 nm and blue, 487 nm were taken. The red emission from Eu~2+ center was mainly come from the 4f~65d~1 absorption in the CaS host. The blue emission From the Bi~3+ center on the other hand showed no big difference from the singly doped CaS:Bi~3+ Materials in excitation spectrum.