STUDY ON THE LOW-TEMPERATURE SYNTHESIS  OF MANGANESE-DOPED ZINC-BARIUM SILICATE LUMINESCENT MATERIALS

Nguyen Thi Thanh

Nguyen Thi Thanh Faculty of Chemical and Environmental Technology, Hung Yen University of Technology and Education

Keywords: luminescent material, zinc silicate, zinc-barium silicate, fluorescent material

Abstract

This work studies the ability to form solid solutions in zinc barium silicate, as well as the effects of Ba²⁺ ions, Mn²⁺ ions, boric acid, and acetic acid on the luminescence and crystalline properties of manganese doped zinc barium silicate luminescent materials. The products were characterized by X-ray diffraction, scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), and PL photoluminescence. The results show that when replacing Zn2+ ions with Ba2+ ions in the formula Zn_1.97Ba_xMn_0.03SiO₄, the product after heating at 900 °C for 45 minutes forms a solid solution as x changes from 0 to 0.5. When x = 0.6, in addition to Zn₂SiO₄, BaZn₂Si₂O₇ is also present. The single-phase solid solutions all have the Rhombo.H.axes structure of Zn₂SiO₄. The sample with the composition Zn_1.57Ba_0.4Mn_0.03SiO₄ has the highest luminescence intensity, emitting green light corresponding to the wavelength of 525 nm when excited by 254 nm. The addition of H₃BO and acetic acid also increases the luminescence of the product.

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