Talk about light dependent phase of photosynthesis.

In thylakoid by photosynthetic chain elements resposible for photolysis, which is splitting of H2O from the thylakoid lumen into O2 protons and electrons. Resulting protons and electrons are carried by Coenxzymes (NADP--NADPH) simuntanously there is generation of a proton gradient in the thylakoid lumen which leads to the activation of ATP synthase which will convert ADP to ATP towards the stroma in a process called photophosphorylation.