Crystal structure, thermal expansion and fluorescence of Sr3–1.5xEuxB2+ySi1–yO8–y/2 phosphors

Maria G. Krzhizhanovskaya, Sergey N. Volkov, Alexey V. Povolotskiy, Rimma S. Bubnova, Olga L. Belousova, Ilya E. Kolesnikov, Sergey N. Britvin, Natalia S. Vlasenko, Vladimir V. Shilovskikh, Stanislav K. Filatov

Research outputpeer-review

Abstract

Three series of Sr3–1.5xEuxB2+ySi1–yO8–y/2 (xEu3+ = 0.01–0.51; y = 0, 0.28, 0.53) solid solutions were prepared by crystallization of the melt. The crystal structures of solid solutions with x = 0.2, y = 0; x = 0.06, y = 0.28; x = 0.23, y = 0.28; x = 0.46, y = 0.28; x = 0.06, y = 0.53 and x = 0.51, y = 0.53 were determined on the basis of single-crystal X-ray diffraction data (XRD) and refined in the orthorhombic space group Pnma to Robs = 0.029, 0.054, 0.030, 0.029, 0.042 and 0.025, respectively. Heterovalent substitution scheme 3Sr2+ → 2Eu3+ + □ is assumed from the single-crystal XRD data. In the phases with xEu3+≥ 0.2 the substitution leads to a split of the Sr/Eu positions. According to the results of powder and single crystal study, the critical concentration of europium in the structure reaches about 17 at. %. The Eu-doped borosilicates are thermally stable upon heating in air up to at least 800 °C, but decompose at above 900 °C forming a mixture of borates and silicates of Sr and Eu. Ceteris paribus, fluorescence intensity of the borosilicates with y = 0 and 0.28 shows a similar high level of fluorescence while that of the series enriched in boron (y = 0.53) is reduced. The measured quantum yield of the promising red phosphors (xEu3+ ≥ 0.4) demonstrates high values from 44 up to 79% depending on Sr/B/Si ratio.

Original languageEnglish
Article number124151
JournalMaterials Chemistry and Physics
Volume260
DOIs
Publication statusPublished - 15 Feb 2021

Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

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