1. Synthesis and luminescence properties of a broad-band red phosphor Ca3Si2O7:Eu2+ for warm white light-emitting diodes
- Author
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Qian, Fengjiao, Fu, Renli, Agathopoulos, Simeon, Gu, Xiguang, and Song, Xiufeng
- Subjects
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LIGHT emitting diodes , *PHOTOLUMINESCENCE , *SILICON oxide , *SOLID state chemistry , *INORGANIC synthesis , *METAL ions , *DIPOLE moments - Abstract
Abstract: Single-phase broad-band red-emitting Ca3Si2O7:Eu2+ 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 H3BO3 as a flux. The phosphors produced have an intense broad red emission band, with a peak at 603nm, a full width at half maximum of 110nm, and color coordinates of (0.550, 0.438). Concentration quenching occurred at 0.01mol Eu2+. The discussion of the results shows that Eu2+ 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 ∼31Å. [Copyright &y& Elsevier]
- Published
- 2012
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