Chemical Unit Cosubstitution and Tuning of Photoluminescence in the Ca<sub>2</sub>(Al<sub>1–<i>x</i></sub>Mg<sub><i>x</i></sub>)(Al<sub>1–<i>x</i></sub>Si<sub>1+<i>x</i></sub>)O<sub>7</sub>:Eu<sup>2+</sup> Phosphor
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