Abstract
Charge transfer band (CTB) plays an important role for the phosphors in the improvement of luminescence intensities, as low light absorption coefficient of the luminescence centers of the rare earth ions. Here, Eu3+-activated La2Mo2O9 phosphors were prepared by hydrothermal approach followed by calcination. Due to the special preparation process, the CTB of the phosphors could be effectively excited to get a very pure red emission. The structure of La2Mo2O9 was characterized. The field environmental factors (he) of La2Mo2O9:Eu3+ crystals were calculated based on complex chemical bond theory. The light absorption property of the MoO78− group was studied. The results indicated that the luminescence of the CTB originated from the three parts like Eu3+-O2-, α-Mo6+-O2- and β-Mo6+-O2-. Moreover, the FE-SEM micrographs, the photoluminescence properties and the decay time of La2Mo2O9:Eu3+ phosphors with different doping concentration were analyzed, which will further be promoting the development of the Eu3+-activated La2Mo2O9 phosphors.
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