Abstract
Abstract A series of Sr 2 MgSi 2 O 7 :Eu 2+ and nitrided Sr 2 MgSi 2 O 7 :Eu 2+ phosphors were synthesized by solid state reactions under a reduction atmosphere. The properties of the synthesized phosphors were characterized by X-ray diffractometer (XRD), infrared spectrophotometer (FTIR), UV–visible scan spectrophotometer (DRS) and luminescence spectrometer (excitation and emission). The XRD and FTIR results demonstrate that the synthesized phosphors have the purely tetragonal crystal structure and Eu 2+ /N 3− ions respectively substitute Sr 2+ /O 2− ions in Sr 2 MgSi 2 O 7 hosts. Sr 2 MgSi 2 O 7 :Eu 2+ exhibits blue emission under the excitation at 360 nm, and the emission intensity shows clear dependence on Eu 2+ concentration. The introduction of N 3− induces the changes of emission intensity and the red shifts of Eu 2+ emission band, which are induced by the higher covalency and polarizability for Eu 2+ -N 3- bonds than that of Eu 2+ -O 2- bonds.
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