Abstract
Phosphors with the composition La1-xGdxAl11O18 (x = 0.01–0.10) were synthesized by combustion at a furnace temperature of 500 °C. The formation of the as-prepared combustion products was confirmed by X-ray diffraction analysis. On excitation with 273 nm, an emission band for the Gd3+ ion was observed at 314 nm. This band progressively enhanced with increasing Gd3+ concentration. The phosphor with low concentrations of Gd3+ ions exhibits prominent ESR lines with geff ∼ 1.9, 2.0, 4.7, and 5.9. With high dopant concentrations, the spectrum shows features similar to those of a U-spectrum with dominant lines with geff ∼ 2.0, 2.9, 4.6, and 6.1. Low field lines arise from distortions in the immediate environment of the Gd3+ ion.
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