Energy Transfer and Thermal Quenching Behaviors of CaLasub 2(MoOsub 4)sub 4:Smsup 3+,Eusup 3+ Red Phosphors

phosphors are prepared using a convenient solid-state reaction route. The red emission intensity of is enhanced by ion codoping. The energy transfer mechanism from to was found to be a dipole-quadrupole interaction with a critical distance of . With increasing doping content, the energy transfer efficiency gradually increased to 75.5%. The thermal quenching behavior was investigated using absorption and emission spectra. The thermal quenching temperature of phosphors is above , and the activation energy of the thermal quenching process is . The effect of codoped ions on the thermal stability of phosphors is investigated.