METAL FLUORIDE CRYSTAL, LIGHT EMITTING ELEMENT, SCINTILLATOR, METHOD FOR DETECTING NEUTRONS, AND METHOD FOR PRODUCING METAL FLUORIDE CRYSTAL

摘要

[Object] To provide: a metal fluoride crystal which has a large amount of light emission; a method for producing the metal fluoride crystal; a light emitting element; a scintillator; and a method for detecting neutrons with use of the metal fluoride crystal. [Solving Means] A light emitting element according to one embodiment of the present invention is configured of a metal fluoride crystal which is represented by chemical formula LiM 1 M 2 F 6 (wherein Li includes 6 Li; M 1 represents at least one alkaline earth metal element selected from among Mg, Ca, Sr and Ba; and M 2 represents at least one metal element selected from among Al, Ga and Sc), said metal fluoride crystal containing 0.02% by mole or more of Eu and having an Eu 2+ concentration of less than 0.01% by mole.