Synthesis of Sr₂Si₅N₈:Eu²⁺ Phosphor for Enhanced Red Emission

Abstract:

For removing impurities to improve luminescence properties, Eu²⁺- activated Sr₂Si₅N₈ red phosphor for white light-emitting diodes (LEDs) was prepared by multiple heat-treatment synthesis which includes carbothermal reduction and nitridation. The X-ray diffraction (XRD) patterns were showed the standard single phase of Sr₂Si₅N₈. With an optimized amount of Eu²⁺ (2 at. %) dopant, the broad excitation band of Sr₂Si₅N₈:Eu²⁺ indicated that the phosphor was suitable for application of white LEDs with UV or blue chip, and red emission peak at 628 nm in spectra originating from the 4f⁶5d¹→4f⁷ transition of Eu²⁺ ion. After third heating process, luminescence properties of the obtained phosphor were improved obviously and higher than commercial YAG:Ce³⁺ phosphor.

• Periodical: Advanced Materials Research (Volumes 233-235)
• Pages: 2705-2709
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.233-235.2705
• Online since: May 2011
• Authors: Van Duong Luong, Wen Tao Zhang, Hong Ro Lee

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