Studies on the luminescence properties of cerium co-doping on Ca MgSi O :Eu phosphor by solid-state reaction method.

Ca MgSi O :Ce , Ca MgSi O :Eu and Ca MgSi O :Eu ,Ce phosphors were prepared using the solid-state reaction method. The crystal structures of the sintered phosphors were of melilite type, which has a tetragonal crystallography. The chemical compositions of the sintered phosphors was confirmed by energy dispersive X-ray spectroscopy. The different thermoluminescence kinetic parameters [activation energy (E), frequency factor (s) and order of the kinetics (b)] of these phosphors were evaluated and compared using the peak shape method. Under ultraviolet excitation, the emission spectra of both Ca MgSi O :Eu and Ca MgSi O :Eu ,Ce phosphors were composed of a broad emission band peaking at 530 nm. When the Ca MgSi O :Eu phosphor is co-doped with Ce ions, photoluminescence, afterglow and mechanoluminescence intensity was strongly enhanced. Ca MgSi O :Eu showed some afterglow with a short persist time. On incorporation of Ce , efficient energy transfer from Ce to Eu was found and the emission intensity of Eu was enhanced. The mechanoluminescence intensities of Ca MgSi O :Ce , Ca MgSi O :Eu and Ca MgSi O :Eu ,Ce phosphors increased proportionally increased with the increase in impact velocity, which suggests that these phosphors can be used as sensors to detect stress in an object.