Abstract
Alumina (Al 2O 3) powders doped with europium trivalent (Eu 3+) were prepared by a low-temperature (∼280 °C) combustion synthesis technique. When the powder was heat treated at 1200 °C for 2 h in the presence of flowing ammonia (NH 3), α-Al 2O 3 crystalline ceramic powders was obtained. The analysis of the luminescence showed that Eu 3+ was reduced to europium divalent (Eu 2+) after the heat-treatment process. Under ultraviolet (UV) lamp excitation ( λ=254 nm) these powders containing sub-microcrystalline structures present bright red (Al 2O 3:Eu 3+) and green (Al 2O 3:Eu 2+) luminescence indicating that this material is a potential candidate for applications in phosphor technology.
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