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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]

Abstract: Chemical stability of 6-coodinated SrO is a fundamental problem when this is used for various applications. In this study, optical and chemical stabilities of 8-coordinated SrO:Eu2+ phosphor were investigated. SrO:Eu2+ phosphor was synthesized from thermal treatment of SrO:Eu powder located on a single crystalline MgO at 1500°C under reduction atmosphere. Obtained 8-coordinated SrO:Eu2+ phosphor exhibit strong blue luminescence and chemical stability in distilled water for 3 days. Our findings prove that obtained 8-coordinated SrO:Eu2+ possesses relative optical and chemical stabilities in water. [Copyright &y& Elsevier]

Abstract: Eu2+-doped SrO (SrO:Eu2+) phosphors were synthesized and their luminescence properties were investigated. Phosphors doped with different Eu2+ concentrations were synthesized by the thermal treatment of SrO and Eu powders on a single crystalline MgO substrate at 1500°C in a reducing atmosphere of Ar and H2. X-ray diffraction measurements showed that the synthesized phosphors contained 8-coordinated SrO with an orthorhombic crystal system. The phosphors showed a strong blue emission at 456nm, which was attributed to the Eu2+ concentration. In addition, a phosphor doped with 2at% Eu2+ showed an internal quantum efficiency of 30%. [Copyright &y& Elsevier]