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dc.contributor.authorden Engelsen, D-
dc.contributor.authorFern, GR-
dc.contributor.authorIreland, TG-
dc.contributor.authorYang, F-
dc.contributor.authorSilver, J-
dc.identifierORCID iD: Daniel den Engelsen; Terry G. Ireland
dc.identifier.citationden Engelsen, D., Fern, G.R., Ireland, T.G., Yang, F. and Silver, J. (2020) 'Photoluminescence and cathodoluminescence of BaAl2O4:Eu2+ and undoped BaAl2O4: evidence for F-centres', Optical Materials Express, 2020, 10(8): 1962 - 1980. doi: 10.1364/OME.10.001962.en_US
dc.description.abstract© Copyright 2020 The Author(s). In this article the photoluminescence (PL) and cathodoluminescence (CL) of undoped BaAl2O4 and BaAl2O4 doped with 500 ppm and 3 mol% Eu2+ is described. The most important results from the CL measurements are: (1) Undoped BaAl2O4 manifested intrinsic CL at 460 nm, which increased at low temperature and did not change significantly upon exposure to the e-beam; (2) Doping BaAl2O4 with Eu2+ changed the character of the intrinsic luminescence band: it became more sensitive to temperature variations and the band experienced a blue shift to ∼425 nm; (3) electron beam (e-beam) exposure of Ba0.97Eu0.03Al2O4 at low temperature increased the 425 nm band strongly while the Eu2+ emission at ∼500 nm decreased by about 70%. The Eu2+ emission band was symmetric, indicating that BaAl2O4:Eu has changed to the P6322 phase upon e-beam exposure at low temperature; (4) We have identified the 460 nm band in undoped BaAl2O4 and the 425 nm band in BaAl2O4:Eu2+ with F-centre luminescence, corresponding to the F-centre emission in α-Al2O3. The evidence for the assignment of the 425 nm band in BaAl2O4:Eu2+ is the spectacular increase of the spectral radiance at 425 nm by e-beam exposure at 200 keV and low temperature. A preliminary model is presented that explains the results. The PL from BaAl2O4:Eu2+ quenched at the rather low temperature of 140°C; this observation is explained in terms of thermal ionization of the Eu2+ ion.-
dc.description.sponsorshipEngineering and Physical Sciences Research Council (CONVERTED (JeS no. TS/1003053/1), FAB3D, PRISM (EP/N508974/1), PURPOSE (TP11/MFE/6/1/AA129F; EP-SRC TS/G000271/1)); TECHNOLOGY STRATEGY BOARD (CONVERT).-
dc.format.extent1962 - 1980-
dc.publisherOptical Society of Americaen_US
dc.rights© Copyright 2020 The Author(s). Published by The Optical Society under the terms of the Creative Commons Attribution 4.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.-
dc.titlePhotoluminescence and cathodoluminescence of BaAl2O4:Eu2+ and undoped BaAl2O4: evidence for F-centresen_US
dc.relation.isPartOfOptical Materials Express-
dc.rights.holderThe Author(s)-
Appears in Collections:Wolfson Centre for Sustainable Materials Development and Processing
Dept of Mechanical and Aerospace Engineering Research Papers

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