Energy Transfer and Thermal Quenching Behaviors of CaLa[sub 2](MoO[sub 4])[sub 4]:Sm[sup 3+],Eu[sup 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.