Synthesis of a Violet Sr–Al–O:Eu²⁺ Phosphor Particle Using Elemental Al Diffusion

Abstract

A violet divalent europium-doped strontium aluminate (Sr-Al-O:Eu 2+ ) phosphor particle was synthesized from a metalethylenediaminetetraacetic 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:Eu 2+ phosphor particles were investigated. The product was determined to be secondary SrAl 12 O 19 :Eu 2+ particles with an average diameter of 20 lm. The violet SrAl 12 O 19 :Eu 2+ emission phase was found in a 1-lm-thick coating of the particles where elemental Al diffusion occurred. These particles are anticipated to find commercial applications such as paints.*Keiji_Komatsu@mst.nagaokaut.ac.jp