Abstract
A red-emitting Eu3+ doped Na5Y4(SiO4)4F fluorosilicate phosphor with tetragonal structure was synthesized by conventional solid state reaction method. The crystal structure, photoluminescence properties and quenching concentration of Na5Y4(SiO4)4F:Eu3+ were investigated in detail. Excited by near-ultraviolet light at 397 nm, the dominant red emission in Na5Y4(SiO4)4F:Eu3+ phosphor is located at 615 nm, which is from the hypersensitive 5D0–7F2 transition of Eu3+ ion. The optimum doping concentration of Eu3+ ion into the host material is up to 50 %, based on which the critical transfer distance is calculated to be 7.72 A. The large transfer distance inhibits the emission quenching. Importantly, through the comparison with NaYSiO4:Eu3+, the intense red emission is attributed to the effect of the F− ion electronegativity on the distorted local crystal environment. All the results show that Na5Y4(SiO4)4F:Eu3+ could be a potential red phosphor for near-ultraviolet white light-emitting diodes.
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