Synthesis Of A Violet Sr-Al-O: Eu 2+Phosphor Particle Using Elemental Al Diffusion

A violet divalent europium-doped strontium aluminate (Sr-Al-O:Eu2+) phosphor particle was synthesized from a metal-ethylenediaminetetraacetic acid (EDTA) solution of Sr, Al, Eu, and particulate alumina via spray drying and sintering in a reducing atmosphere. The emission properties, crystal structures, cross-sectional emissions, and elemental distributions of the obtained Sr-Al-O:Eu2+ phosphor particles were investigated. The product was determined to be secondary SrAl12O19:Eu2+ particles with an average diameter of 20m. The violet SrAl12O19:Eu2+ emission phase was found in a 1-m-thick coating of the particles where elemental Al diffusion occurred. These particles are anticipated to find commercial applications such as paints.