Production of phosphor (YAG∶Tb) fine particles by hydrothermal synthesis in supercritical water

Abstract

Rapid and continuous production of phosphor (YAG∶Tb) fine particles by hydrothermal synthesis in supercritical water was studied. At temperatures higher than the critical temperature of water, continuous and rapid (<60 s) production of YAG∶Tb fine particles was achieved. Emission spectra obtained by UV excitation of the particles were in agreement with the typical spectral pattern of YAG∶Tb. Single phase YAG∶Tb was produced by using stoichiometric mixtures of metal salts [Al(NO₃)₃, Y(NO₃)₃, and TbCl₃] as aqueous solutions with an alkali molar ratio {[OH^–]/([NO₃^–] + [Cl^–])} of 1 and a rapid heating method. No additional thermal treatment was necessary to obtain crystalline products.

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