Cerium and terbium ions doped strontium aluminosilicate polycrystalline phosphors.

Cerium and terbium ions doped strontium aluminosilicate polycrystalline phosphors with monoclinic structure identified to I2/c space group were synthesized by the high temperature solid-state reaction. Differential NUV-blue fluorescence behaviors of Ce 3+ were exhibited under UVB radiation, which were originated from the luminescence centers with different crystal field environment. Bright green fluorescence of Tb 3+ was released under UVA radiation, and with the intervention of Ce 3+ ions, the effective excitation spectral range of Tb 3+ ions was extended from UVA to UVB due to the energy transfer from Ce 3+ to Tb 3+ . Upon the excitation in extended region, the luminescence intensity of Tb 3+ was remarkably strengthened by a maximum fluorescence sensitization factor of ~152. These results demonstrate that Ce 3+ and Tb 3+ doped SrAl 2 Si 2 O 8 polycrystals are valuable NUV-blue and green phosphors, which have potential applications for phototherapy and color display. [ABSTRACT FROM AUTHOR]