TY - JOUR

T1 - Crystal structure, thermal expansion and fluorescence of Sr3–1.5xEuxB2+ySi1–yO8–y/2 phosphors

AU - Krzhizhanovskaya, Maria G.

AU - Volkov, Sergey N.

AU - Povolotskiy, Alexey V.

AU - Bubnova, Rimma S.

AU - Belousova, Olga L.

AU - Kolesnikov, Ilya E.

AU - Britvin, Sergey N.

AU - Vlasenko, Natalia S.

AU - Shilovskikh, Vladimir V.

AU - Filatov, Stanislav K.

N1 - Funding Information: This research was financially supported by the Russian Foundation for Basic Research (№ 17-03-00887 ). The authors acknowledge the Resource Center of X-ray diffraction Studies, Center for Optical and Laser Materials Research and “Geomodel” Resource Centre of Saint Petersburg State University for instrumental and computational resources. Publisher Copyright: © 2020 Elsevier B.V. Copyright: Copyright 2020 Elsevier B.V., All rights reserved.

PY - 2021/2/1

Y1 - 2021/2/1

N2 - 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.

AB - 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.

KW - Borosilicate

KW - Crystal structure

KW - Luminescence

KW - Rare earth compounds

KW - Thermal expansion

UR - http://www.scopus.com/inward/record.url?scp=85097654338&partnerID=8YFLogxK

U2 - 10.1016/j.matchemphys.2020.124151

DO - 10.1016/j.matchemphys.2020.124151

M3 - Article

AN - SCOPUS:85097654338

VL - 260

JO - Materials Chemistry and Physics

JF - Materials Chemistry and Physics

SN - 0254-0584

M1 - 124151

ER -