Shock-compression on Eu$_{2}$O$_{3}$ doped pollucite phosphors

Pollucite CsAlSi$_{2}$O$_{6}$ is a natural mineral belong to zeolite group formed with analcime, and general formula is following: (Cs,Na)$_{16}$Al$_{16}$Si$_{32}$O$_{96}$$\cdot$n(H$_{2}$O). The crystal structure of pure CsAlSi$_{2}$O$_{6}$ is cubic(Ia-3d) and unit cell is 136645 nm Pollucite is stable stone yielding on the surface of the Earth since ancient times and is used to as a raw material of Cs element. Eu$_{2}$O$_{3}$-doped pollucite phosphors are efficient white phosphor for Application of deep-UV -light emitting diode (LED). Phosphors were prepared by solid-state reaction. 1 mol{\%} Eu$_{2}$O$_{3}$-doped and 3 mol{\%} Eu$_{2}$O$_{3}$-doped pollucites were prepared. Shock-recovery experiments were conducted involving the impact of a flyer plate accelerated by a single-stage powder-propellant gun. The recovered samples were characterized by X-ray diffraction (XRD) analysis and photoluminescence (PL) spectroscopy. The XRD and PL results of samples shocked at pressures of 22 GPa~indicated that dissolution and amorphous-to-crystalline transformation occurred. In addition, emission peak wavelength of 3 mol{\%} Eu$_{2}$O$_{3}$-doped sample shift 20 nm(520$\to $500 nm). As a result, it is considered that Eu$^{2+}$ moved in the crystalline by shock-compression.