Strontium aluminate is an aluminate compound with the chemical formula  (sometimes written as ). It is a pale yellow, monoclinic crystalline powder that is odourless and non-flammable. When activated with a suitable dopant (e.g. europium, written as ), it acts as a photoluminescent phosphor with long persistence of phosphorescence.
Strontium aluminates exist in a variety of other compositions including  (monoclinic),  (cubic),  (hexagonal), and  (orthorhombic). The different compositions cause different colours of light to be emitted.