Crystal structure, photoluminescence and cathodoluminescence of Ba1-xSrxAl2O4 doped with Eu2

Herein we describe the synthesis, crystal structures, photoluminescence (PL) and cathodoluminescence (CL) spectra of phosphors in the Sr0.97-xBaxEu0.03Al2O4 system between x = 0 and x = 0.97. The syntheses of these phosphors were carried out by solid state reactions at 1350°C in mixed gas (H2/N2). T...

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Bibliographic Details
Published in:Optical materials express 2020-08, Vol.10 (8), p.1951
Main Authors: Volhard, Max, Yu, Liping, den Engelsen, Daniel, Fern, George R, Ireland, Terry G, Silver, Jack
Format: Article
Language:English
Subjects:
Barium
Cathodoluminescence
Crystal structure
Europium
Ferroelectricity
Hexagonal phase
Phosphors
Photoluminescence
Room temperature
Solid solutions
Spectra
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Summary:Herein we describe the synthesis, crystal structures, photoluminescence (PL) and cathodoluminescence (CL) spectra of phosphors in the Sr0.97-xBaxEu0.03Al2O4 system between x = 0 and x = 0.97. The syntheses of these phosphors were carried out by solid state reactions at 1350°C in mixed gas (H2/N2). The molar fractions of the alkaline earth elements were varied in steps of 0.1. The Sr1-xBaxAl2O4 series manifested solid solutions of a monoclinic phase (at the Sr-rich side) and a hexagonal phase (at the Ba-rich side). At the Ba-rich side of Srx-1BaxAl2O4:Eu2+ we found evidence in the PL spectra that the hexagonal phase differed as the xBa fraction changed: it changed at room temperature from the ferroelectric P63 structure at xBa=1 to the paraelectric P6322 phase at xBa≈0.9 and at xBa≈0.8 it went back to P63. Unlike the PL spectra, the CL spectra of the hexagonal phase of Sr0.97-xBaxEu0.03Al2O4 at x ≥ 0.5 indicated only the paraelectric P6322 phase at room temperature.
ISSN:2159-3930
DOI:10.1364/OME.10.001951