Distinctive features of the crystal-chemical, thermal and luminescence properties of (Zn0.94Mg0.06)2SiO4:Mn phosphor

• Published in: Journal of alloys and compounds Vol. 907; p. 164433
• Main Authors: Krasnenko, Tatiana I., Samigullina, Rina F., Zaitseva, Natalia A., Ivanova, Irina I., Pryanichnikov, Stepan V., Rotermel, Maria V.
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier B.V 25.06.2022; Elsevier BV
• Subjects: Crystallography; Decay; Luminescence; Magnesium; Manganese ions; Optical properties; Optical spectroscopy; Oxidation; Parameters; Phase transitions; Phosphors; Photoluminescence; Solid phases; Solid solutions; Solid state reactions; Thermal analysis; Unit cell; X ray photoelectron spectroscopy; X-ray diffraction; Zinc silicates; Solid state reactions; X-ray diffraction; Optical spectroscopy; Thermal analysis; Phosphors; Luminescence
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2022.164433

•A comparative analysis of Zn1.88–2xMn2xMg0.12SiO4 and Zn2–2xMn2xSiO4 was performed.•Lattice parameters of both solid solutions change nonmonotonically.•Melting points of solid solutions decrease with increasing manganese concentration.•The introduction of 6 at% magnesium reduces decay time by almost a factor of two. [Display omitted] The effect of magnesium introduction on the structural, thermal, and luminescent characteristics of Zn2SiO4:Mn at the fixed magnesium concentration of 6 at% has been studied. Zn1.88–2xMn2xMg0.12SiO4 phosphors were synthesized by the solid phase method. The structural properties were studied using X-ray diffraction. The luminescent properties were characterized by the PLE and PL spectra. The charge state of manganese ions was determined by the XPS method. It was found that the Zn1.88–2xMn2xMg0.12SiO4 samples at x ≤ 0.14 were single-phase. The unit cell parameters of the solid solutions changed nonmonotonically with increasing x. The change in the linear trend of the parameters occurred at x = 0.06, and was caused by the oxidation of a part of the Mn2+ ions to Mn3+. The introduction of 6 at% magnesium into the Zn2–2xMn2xSiO4 structure caused an inversion of the crystallographic positions in which manganese was predominantly oxidized. It was shown that the melting temperatures of the Zn2–2xMn2xSiO4 and Zn1.88–2xMn2xMg0.12SiO4 solid solutions decreased with increasing manganese concentration, but were practically independent of the presence of magnesium. The structural phase transition α→β was recorded in the premelting region for all Zn2–2xMn2xSiO4 compositions. For the Zn1.88–2xMn2xMg0.12SiO4 solid solutions, the α→β transition was registered only for x˂0.06. The optimal photoluminescence intensity of Zn2–2xMn2xSiO4 shifted to the region of lower values of x with the introduction of magnesium and turned out to be maximum for Zn1.76Mn0.12Mg0.12SiO4. The introduction of 6 at% magnesium reduced the decay time by almost a factor of two; for the sample with x = 0.06 the decay time was 0.654 ms.