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

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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