Abstract
The rod-like NaSr2Nb5O15: 0.03Eu3+ phosphors have been synthesized via the molten salt synthesis (MSS). The as-prepared phosphors were characterized by X-ray diffraction (XRD), Field emission scanning electron microscope (FE-SEM), Energy dispersive X-ray analysis (EDAX), Transmission electron microscope (TEM), High-resolution transmission electron microscope (HRTEM), UV–Vis–NIR spectrophotometer and Photoluminescence spectrometer (PL). The results indicated that the symmetry of A1 site is higher than A2 site in NaSr2Nb5O15 lattice. The morphology and dimensions could be adjusted by controlling the reaction conditions, and the morphology evolution process was proposed. With the increasing of the time and temperature, the average sizes of the obtained particles increased from 10.91 μm to 24.03 μm in length, and from 2.82 μm to 13.68 μm in diameter, whereas the aspect ratio reduced from 4.07 to 1.84. Meanwhile, the luminescence intensity and lifetime increased with the decreasing of the aspect ratio. Furthermore, the emission spectra of the phosphors were diverse under the different excitations (NUV and blue light). The present work shows that the NaSr2Nb5O15: Eu3+ could be a potential phosphor for LED.
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