Abstract
A series of novel Eu 2+-activated CaSi 6N 8O greenish-yellow phosphors were synthesized via solid state reaction method. The synthesized CaSi 6N 8O:Eu 2+ phosphors could absorb UV to near UV light. The emission spectra exhibited a broad greenish-yellow emission band when excited with a light of wavelength 405 nm. The emission spectrum shifted towards longer wavelength with increasing Eu 2+ concentration. The emission intensity increased with the increasing Eu 2+ concentration and the quenching concentration was found to be 0.1 mol. The observed results were explained by the energy transfer mechanism due to dipole–dipole interactions among Eu 2+ ions. These novel greenish-yellow CaSi 6N 8O:Eu 2+ phosphors could be considered as potential candidate for the white LED applications.
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