Abstract
The well-crystalline SrAlSi4N7:Eu2+ phosphor could be synthesized by the solid-state reaction method using different types of Si3N4 raw material. The corresponding reaction mechanism was studied by means of X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive spectrometry (EDS) and fluorescence spectra. It was found that the structural difference between α-Si3N4 and β-Si3N4, and the rearrangement of Si3N4 microstructures at high temperature had an important influence on the formation of SrAlSi4N7 phase. Results showed that the α-β transformation of Si3N4 was included in the synthesis reaction of SrAlSi4N7. So the reaction mechanism of SrAlSi4N7:Eu2+ phosphor should be: α-Si3N4→β-Si3N4; β-Si3N4+AlN+Sr2N→SrAlSi4N7. The β-Si3N4 seeds addition were actually helpful to the grain growth of α-β transformation of Si3N4 and then increased the synthesis reaction rate of SrAlSi4N7. Pure SrAlSi4N7:Eu2+ phosphor with higher luminous efficacy and better crystal morphology was finally obtained, indicating that the as-synthesized phosphor was an attractive candidate material as an orange-red component for warm white light LEDs.
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