Molybdate compound, preparation method and application thereof

The invention discloses a molybdate compound, a preparation method and application thereof. A general structural formula of the compound is K7.5Y1.5-xEuxMo6O24, wherein x is more than or equal to 0.1 and is less than or equal to 1.4; and the x is integral multiple of 0.1. The preparation method of the molybdate compound comprises the following steps that: Eu2O3, Y2O3, MoO3 and K2CO3 are weighed according to the stoichiometric ratio in the structural formula and are ground and mixed evenly, the mixture is subjected to thermal insulation for 3 to 5 hours at a temperature of between 250 and 350 DEG C for presintering, the grinding is performed after the sample is cooled, and the sample is subjected to thermal insulation for 4 to 8 hours at a temperature of between 600 and 650 DEG C to obtain a crude product; and the crude product is cooled to room temperature and then is sieved to obtain primary selection powder, the primary selection powder is added with water to stir, the mixture is subjected to ultrasonic dis