Patent ID: 8778225

Claim:
A production process for an iodide single crystal having a crystal structure the same as LuI 3 and activated by a luminescence center RE, where RE is at least one element selected from the group consisting of Ce, Pr, Nd, Sm, Eu, Tb, Dy, Ho, Er, Tm, and Yb, the method comprising: a step of preparing starting materials comprising an RE metal or REI 3 , I 2 , and a Lu metal, and a metal of Y and/or Gd; a step of maintaining said starting materials under vacuum; a step of heating said starting materials at a reaction temperature of said starting materials to create a raw polycrystal containing at least LuXI 3 :RE, where X is Y and/or Gd; and a step of turning said raw poly-crystal into a single crystal.