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DC Field | Value | Language |
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dc.contributor.author | Den Engelsen, D | - |
dc.contributor.author | Harris, PG | - |
dc.contributor.author | Ireland, TG | - |
dc.contributor.author | Fern, G | - |
dc.contributor.author | Silver, J | - |
dc.date.accessioned | 2016-02-22T12:17:51Z | - |
dc.date.available | 2015-05-12 | - |
dc.date.available | 2016-02-22T12:17:51Z | - |
dc.date.issued | 2015 | - |
dc.identifier.citation | ECS Journal of Solid State Science and Technology, 4 (7): pp. R105 - R113, (2015) | en_US |
dc.identifier.issn | 2162-8769 | - |
dc.identifier.issn | 2162-8777 | - |
dc.identifier.uri | http://jss.ecsdl.org/content/4/7/R105.abstract | - |
dc.identifier.uri | http://bura.brunel.ac.uk/handle/2438/12156 | - |
dc.description.abstract | Herein the preparation and cathodoluminescence of nanoparticles of cubic Y<inf>2</inf>O<inf>3</inf>:Tb<sup>3+</sup> having Tb<sup>3+</sup> concentration varying between 0.1 and 10 Mol% are described. The cathodoluminescence spectra were recorded with a high resolution spectrometer, which enabled the identification of Tb<sup>3+</sup> lines with C<inf>2</inf> and S<inf>6</inf> symmetry: the lines at 542.8 nm and 544.4 nm were designated as 5D4→7F5 (C2) and 5D4→7F5 (S6) respectively. The critical distance for energy transfer from Tb<sup>3+</sup> ions at S6 lattice sites to Tb<sup>3+</sup> ions at C<inf>2</inf> lattice sites was found to be >1.7 nm. At the greater distances which prevail at low Tb<sup>3+</sup> concentration, this energy transfer virtually stops. From cathodoluminescence spectra recorded in a scanning transmission electron microscope it was concluded that this energy transfer also did not take place if the temperature was reduced below 102 K. The efficiency of the cathodoluminescence of 1% Y<inf>2</inf>O<inf>3</inf>:Tb<sup>3+</sup> was 6 lm/w at a beam voltage of 15 kV. The decay time of the 5D4→7F5 (C<inf>2</inf>) transition was substantially shorter than that of the 5D4→7F5 (S6) transition at low Tb<sup>3+</sup> concentrations. The decay behavior of the cathodoluminescence images in a field emission scanning electron microscope has been explained in terms of phosphor saturation. | en_US |
dc.description.sponsorship | We are grateful to the EPSRC and the Technology Strategy Board (TSB) for funding the PURPOSE (TP11/MFE/6/I/AA129F; EPSRCTS/G000271/1) and CONVERTED (JeS no. TS/1003053/1) programs. We are also grateful to the TSB for funding the CONVERT program. | en_US |
dc.format.extent | R105 - R113 | - |
dc.language.iso | en | en_US |
dc.publisher | The Electrochemical Society | en_US |
dc.subject | Cathodoluminescence | en_US |
dc.subject | Decay | en_US |
dc.subject | Energy transfer | en_US |
dc.subject | Luminous efficacy | en_US |
dc.subject | Saturation | en_US |
dc.title | Symmetry-related transitions in the spectrum of nanosized Cubic Y2O3: Tb3+ | en_US |
dc.type | Article | en_US |
dc.identifier.doi | http://dx.doi.org/10.1149/2.0251507jss | - |
dc.relation.isPartOf | ECS Journal of Solid State Science and Technology | - |
pubs.issue | 7 | - |
pubs.publication-status | Published | - |
pubs.publication-status | Published | - |
pubs.volume | 4 | - |
Appears in Collections: | Wolfson Centre for Sustainable Materials Development and Processing |
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Fulltext.pdf | 1.71 MB | Adobe PDF | View/Open |
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