Ca La2 (Mo O4)4: Sm3+, Eu3+ phosphors are prepared using a convenient solid-state reaction route. The red emission intensity of Eu3+ is enhanced by Sm3+ ion codoping. The energy transfer mechanism from Sm3+ to Eu3+ was found to be a dipole-quadrupole interaction with a critical distance of 10.42 Å. With increasing Eu3+ doping content, the energy transfer efficiency (Sm3+ → Eu3+) gradually increased to 75.5%. The thermal quenching behavior was investigated using absorption and emission spectra. The thermal quenching temperature (T50) of Ca La2 (Mo O4)4: Sm3+, Eu3+ phosphors is above 200°C, and the activation energy of the thermal quenching process is 0.13 eV. The effect of codoped Sm3+ ions on the thermal stability of Ca La2 (Mo O4)4: Sm3+, Eu3+ phosphors is investigated.
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