The synthesis of ATP molecules (Chemical Energy) by the addition of inorganic phosphorous in ADP in presence of light and chlorophyll-a during the photochemical phase of photosynthesis is called photophosphorylation.
Light
ADP + H3PO4 −−−−−−−−→ ATP
Chlorophyll-a
ADP - Adenosine di phosphate
ATP - Adenosine tri phosphate