D-Luciferin phosphate is a highly sensitive bioluminescent substrate for detecting alkaline phosphatases and protein phosphatases by luminometric detection. It is used in combination with luciferase/ATP system. D-Luciferin phosphate can be converted to D-Luciferin by phosphatases (such as alkaline phosphatases, acid phosphatases and protein phosphatases) that gives luminescence in the presence of luciferase and its cofactors. Our Amplite luciferase assay kit can be used for detecting D-luciferin release from D-Luciferin phosphate by phosphatases.