Synthesis of a Violet Sr- Al- O: Eu2+ 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 Sr Al₁₂ O₁₉: Eu²⁺ particles with an average diameter of 20 μm. The violet Sr Al₁₂ O₁₉: Eu²⁺ emission phase was found in a 1-μm-thick coating of the particles where elemental Al diffusion occurred. These particles are anticipated to find commercial applications such as paints. [ABSTRACT FROM AUTHOR]