This paper reporteda novel synthetic route to Eu2+ doped SrSiN2 deep red phosphors for white light-emitting diodes. A se-ries of single-phased and high-efficiency SrSiN2:Eu2+ red phosphors were synthesized based on this method. Their structure, mor-phology, luminescence, quantum efficiency (QE) and thermal quenching properties were investigated and compared with those of SrSiN2: Eu2+ prepared by the conventional route. It was found that the addition of a small amount of Si3N4 could promote the forma-tion of SrSiN2from Sr2Si5N8phase. A highly uniform rod-shaped morphology was obtained based on this method. The X-ray powder diffraction and the Rietveld refinement analysis identified the preferential crystalline orientation growth. Under the blue light excita-tion, Eu2+ doped SrSiN2 phosphors showed excellent optical properties. Compared with those prepared by the conventional ap-proaches, the external QE of SrSiN2:Eu2+phosphor was greatly improved, allowing it a promising phosphor for white LEDs.
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