Abstract
A series of Tb3+ and Sm3+ co-doped LaOF phosphors were prepared by hydrothermal assisted solid state method using LaOF crystal as matrix. The crystal structure, morphology, luminescent properties, the energy transfer from (5D4)Tb3+ to (4G5/2)Sm3+ ions and the 5D4→7F5 transition of the Tb3+ ions in LaOF: Tb3+, Sm3+ phosphors have been investigated in details. Experiment results revealed that all the synthesized samples were pure tetragonal phase LaOF, the particle size ranged from 0.2 to 1.0 μm. The green to yellow lighting colour can be finely tuned by controlling different Sm3+ ion concentrations upon 379 nm excitation. Moreover, the exchange interaction as well as electric multipole interaction models were adopted to investigate physical nature for the energy transfer mechanism, and the electric multipole interaction between Tb3+ and Sm3+ was confirmed to be the right mechanism.
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