The experimental results show that the synthesized product is orthorhombic LiZn0.9PO4: Mn0.1路H2O, monoclinic LiZn0.9PO4:Mn0.1 is a green-yellow emitting phosphor which can be obtained after calcining LiZn0.9PO4:Mn0.1路H2O at 600 掳C in air. Based on the iterative iso-conversional procedure, the average values of the activation energies associated with the thermal dehydration of LiZn0.9PO4:Mn0.1路H2O, was determined to be 90.28 kJ mol鈭?. Dehydration of the crystal water molecule of LiZn0.9PO4:Mn0.1路H2O is single-step reaction mechanism. A method of multiple rate iso-temperature was used to determine the most probable mechanism