Luminescent properties and energy transfer mechanism from Tb³⁺ to Eu³⁺ in CaMoO₄:Tb³⁺,Eu³⁺ phosphors

熊健会，孟庆裕，孙文军

Key Laboratory for Photonic and Electronic Bandgap Materials, Ministry of Education, School of Physics and Electronic Engineering, Harbin Normal University

摘 要：A series of CaMoO₄:Tb³⁺,Eu³⁺ phosphors were prepared by the method of precipitation. The structure and morphology of the phosphors were characterized by the X-ray diffraction（XRD） and field emission scanning electron microscopy（FE-SEM）. The photoluminescence properties of the prepared products were researched, and the energy transfer from Tb³⁺ to Eu³⁺ in CaMoO₄ phosphors was studied. By adjusting the doping concentration of Eu³⁺ ions in CaMoO₄:Tb³⁺,Eu³⁺ phosphors, the emitting color of the phosphors could be easily tuned from green to red. With Tb³⁺ doped in the phosphors, the red luminescence of Eu³⁺ by near UV excitation was significantly enhanced. The energy transfer efficiency, rate and average distance between Tb³⁺ and Eu³⁺ in CaMoO₄:5%Tb³⁺,x%Eu³⁺（mole percent） phosphors（x=0.3–10） were calculated. It was found that the interaction type between Tb³⁺ and Eu³⁺ was electric dipole-dipole interaction in the phosphors.

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