Synthesis, electrical properties, and optical characterization of Eu3+-doped La2Mo2O9 nanocrystalline phosphors

摘要: Abstract The lanthanum molybdate phosphor, La2Mo2O9, is a new fast ionic conductor that has shown potential uses as nanocrystalline matrix for optically active lanthanide ions. Eu3+-doped La2Mo2O9 phosphors were prepared from freeze–dried powder precursor and the nano-polycrystalline powders obtained characterized by XRD, DSC, TG/DTA, SEM, impedance spectroscopy, optical spectroscopy. substitution of La3+ Eu3+ in La2−xEuxMo2O9 suppresses partially phase transition observed undoped samples increases both density sintered pellets conductivity. Polycrystalline phosphor exhibits transitions UV–visible region at low temperature, although there luminescence quenching process with temperature. At room temperature orange red emissions are only when doping Moreover, nanocrystal-size dependent energy transfer to ions occurs.