The preparation process of Europium Fluoride EuF3 EuF2 sample is as follows: Weigh a certain amount of Eu₂O₃ into a beaker, add an appropriate amount of HNO₃ and distilled water, stir and heat until the Eu₂O₃ is completely dissolved and becomes clear; then weigh the chelating agent into the beaker, add Distilled water, stir with a glass rod until homogeneous, place the beaker on a magnetic stirrer and stir for a certain time.

Weigh NH₄F into the beaker, add distilled water, stir to dissolve, pour into the beaker, and stir magnetically for a certain period of time; pour the liquid in the beaker (I) into the stainless steel reaction kettle with PTFE lining, Add distilled water to make the liquid level reach a certain height, adjust the pH value of the reaction kettle liquid with nitric acid or ammonia water at the same time, and seal the reaction kettle.

The reaction kettle was placed in an electric heating blast drying oven, and reacted at a certain temperature for a certain period of time; the products obtained from the reaction were washed with dehydrated alcohol and distilled water by centrifugal washing; Europium Fluoride EuF3 EuF2 samples.