Description:
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Europium-activated strontium aluminate phosphor, Sr<jats:sub>3</jats:sub>Al<jats:sub>2</jats:sub>O<jats:sub>6</jats:sub>:Eu<jats:sup>2+</jats:sup>, was prepared by solid-state reaction. The main concerns on the formation of a stable Sr<jats:sub>3</jats:sub>Al<jats:sub>2</jats:sub>O<jats:sub>6</jats:sub> phase and the complete reduction of europium ions in this crystal phase, which is considered controversial in the literature and is available for white light-emitting-diode application, were addressed. It was found that the single phase of Sr<jats:sub>3</jats:sub>Al<jats:sub>2</jats:sub>O<jats:sub>6</jats:sub> could be well formed and the valence state of europium ions depended on treatment temperature, flux, reduction gas, and the resultant stiffness of the host lattice. The redshift emission of Eu<jats:sup>2+</jats:sup> in the Sr<jats:sub>3</jats:sub>Al<jats:sub>2</jats:sub>O<jats:sub>6</jats:sub> host was not marked in our experimental regime. However, the green emission of Sr<jats:sub>3</jats:sub>Al<jats:sub>2</jats:sub>O<jats:sub>6</jats:sub>:Eu<jats:sup>2+</jats:sup> increased gradually with the mole fraction of Al<jats:sub>2</jats:sub>O<jats:sub>3</jats:sub> to SrCO<jats:sub>3</jats:sub> in the starting materials owing to the complete formation of the Sr<jats:sub>3</jats:sub>Al<jats:sub>2</jats:sub>O<jats:sub>6</jats:sub> phase.
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