Synthesis of Zn_2−xMn_xSiO₄phosphors using a hydrothermal technique

Zn_2−xMn_xSiO₄phosphors were synthesized by a hydrothermal process using ZnO and SiO₂. Prismatic Zn₄Si₂O₇(OH)₂· H₂O particles were formed through heterogeneous nucleation on the surface of the ZnO particles. The Zn₂SiO₄phase was formed through an isometric phase transition of Zn₄Si₂O₇(OH)₂· H₂O. Water pressure, as well as the particle size of the raw materials, had a profound effect on the temperature of phase formation. The effect of solution pH on the morphology and growth of the particles was investigated. The photoluminescence of the synthesized Zn_2−xMn_xSiO₄phosphor was also examined. The color coordinate of the Zn_2−xMn_xSiO₄phosphor obtained in this study showed a green color, which was shifted toward short wavelength.