A novel approach to the preparation of manganese - doped zinc silicate luminescent material according to the precipitation method

Abstract

The purpose of this work is to study the effect of some precipitation conditions on the luminescent properties of manganese-doped zinc silicate when synthesized in a new approach - impregnated precipitation method. The samples are characterized by thermal analysis, infrared IR, luminescent spectrum (PL), X-ray diffraction spectrum and scanning electron microscope (SEM). The results showed that manganese - doped zinc silicate luminescent material prepared by the impregnated precipitation method has higher luminescence than the traditional co-precipitation method. Samples with the highest luminescent properties were synthesized under the following conditions: concentration of Zn (CH₃COO)₂ is 1M, the precipitate aging time of 20 minutes, the washed filtered precipitate, impregnated with Mn²⁺ with a content of 1.5 % mol compared to the total metal, dried at 80 °C and then heat at 900 ⁰C for 45 minutes. The obtained product is single-phase zinc silicate with composition of Zn_1,97Mn_0,03SiO₄, rhombic structure with most particles varying in size of 0.3 - 0.5 µm, emitting green light with λ_max = 525 nm when excited by UV rays with wavelength of 254 nm. Forming a single-phase Zn₂SiO₄ crystal at 900 ⁰C for 45 minutes allowed to reduce the energy required for the sintering process compared with the solid - phase reaction method.