Synthesis and luminescence properties of a broad-band red phosphor Ca sub(3Si) sub(2)O sub(7:Eu) super(2)+ for warm white light-emitting diodes

Single-phase broad-band red-emitting Ca sub(3Si) sub(2)O sub(7:Eu) super(2)+ phosphors, with photoluminescence features that qualify them as candidates for white light-emitting diodes applications, were successfully synthesized via a modified solid-state reaction method that employed H sub(3BO) sub(3) as a flux. The phosphors produced have an intense broad red emission band, with a peak at 603 nm, a full width at half maximum of 110 nm, and color coordinates of (0.550, 0.438). Concentration quenching occurred at 0.01 mol Eu super(2+. The discussion of the results shows that Eu) super(2)+ ions should be accommodated at the Ca-sites of the lattice, dipole-dipole interactions should predominantly govern the energy transfer mechanism among them, and the critical distance between them is [not, vert, similar]31 Aa.