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Formation mechanism and luminescence appearance of Mn-doped zinc silicate particles synthesized in supercritical water |
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| Authors: | Masafumi Takesue Atsuko Suino Hiromichi Hayashi |
| Affiliation: | a Research Center of Supercritical Fluid Technology, Tohoku University, 6-6-11, Aramaki Aza Aoba, Aoba-ku, Sendai 980-8579, Japan b Research and Development Center, Bando Chemical Industries, Ltd., 4-6-6, Minatojima Minamimachi, Chuo-ku, Kobe 650-0047, Japan c Research Center for Compact Chemical Process, National Institute of Advanced Industrial Science and Technology, 4-2-1, Nigatake, Miyagino-ku, Sendai 983-8551, Japan |
| Abstract: | Luminescence appearance of Mn-doped zinc silicate (Zn2SiO4:Mn2+, ZSM) formed in supercritical water at 400 °C and 29 MPa at reaction times from 1 to 4320 min was studied in the relation to its phase formation mechanism. Appearance of luminescent ZSM from green emission by α-ZSM and yellow emission by β-ZSM occurred over the same time period during the onset of phase formation at a reaction time of 2 min. Luminescence appeared at a much lower temperature and at shorter reaction times than the conventional solid-state reaction. Needle-like-shaped α-ZSM was the most stable particle shape and phase in the supercritical water reaction environment and particles formed via two routes: a homogenous nucleation route and a heterogenous route that involves solid-state diffusion and recrystallization. |
| Keywords: | Supercritical water Hydrothermal reaction Low-temperature process Phase formation Luminescence appearance Inorganic phosphor |
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