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DC Field | Value | Language |
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dc.contributor.author | Pasberg, N | - |
dc.contributor.author | den Engelsen, D | - |
dc.contributor.author | Fern, GR | - |
dc.contributor.author | Harris, PG | - |
dc.contributor.author | Ireland, TG | - |
dc.contributor.author | Silver, J | - |
dc.date.accessioned | 2017-07-13T11:48:25Z | - |
dc.date.available | 2017-07-13T11:48:25Z | - |
dc.date.issued | 2017-05-19 | - |
dc.identifier.citation | Pasberg, N., den Engelsen, D., Fern, G.R., Harris, P.G., Ireland, T.G. and Silver, J. (2017) 'Structure and luminescence analyses of simultaneously synthesised (Lu1−xGdx)2O2S:Tb3+ and (Lu1−xGdx)2O3:Tb3+', Dalton Transactions, 46(24), pp. 7693-7707. doi: 10.1039/C7DT00862G. | en_US |
dc.identifier.issn | 1477-9226 | - |
dc.identifier.uri | https://bura.brunel.ac.uk/handle/2438/14911 | - |
dc.description.abstract | Copyright © 2017 The Author(s). Herein we describe the synthesis and luminescence of nanosized (Lu1−y–xGdx)2O2S:Tby and (Lu1−y–xGdx)2O3:Tby phosphors with y = 0.1 mol% Tb3+ and y = 2 mol% Tb3+ and x ranging between 0 and 1. The concentration of Gd3+ (x) was varied in steps of 0.1 (molar ratio Gd3+). The samples at 0.1 < x < 0.7 contained a mixture of (Lu1−xGdx)2O3:Tb3+ and (Lu1−xGdx)2O2S:Tb3+, while the samples at x = 0 contained only Lu2O3:Tb3+. At 0.1 < x < 0.7 Lu2O2S:Tb3+ and Gd2O2S:Tb3+ did not form a solid solution, but rather crystallised into two slightly different hexagonal structures. This behaviour has been explained in terms of segregation of Lu and Gd between the oxide and oxysulfide phases: the oxide phase is more Lu-rich whereas the second oxysulfide phase is more Gd-rich. The photoluminescence spectra of the phosphors with 0.1 mol% Tb3+ showed a modest colour change of the fluorescence light from cyan to green when x was increased from 0 to 1, whereas the samples of the series with 2 mol% Tb3+ yielded essentially green light. From this analysis it was concluded that the colour change of (Lu1−xGdx)2O2S:0.1%Tb3+ is caused by increasing energy transfer of the 5D3-level of Tb3+ to the charge transfer band of (Lu1−xGdx)2O2S:Tb3+ upon increasing x. Since the samples with 100% Lu consisted of pure cubic Lu2O3:Tb3+, we had the opportunity to also study the symmetry-related PL of this compound. From this study we concluded that the C2–C3i doublet of the Tb3+ 5D4 → 7F5 transition behaves in the same way as the corresponding doublet in cubic Y2O3:Tb3+. | en_US |
dc.description.sponsorship | We are grateful to the EPSRC and Technology Strategy Board (TSB) for funding the PURPOSE (TP11/MFE/6/1/AA129F; EP-SRC TS/G000271/1) and CONVERTED (JeS no. TS/1003053/ 1), PRISM (EP/N508974/1) and FAB3D programs. We are finally grateful to the TSB for funding the CONVERT program. | en_US |
dc.format.medium | Print-Electronic | - |
dc.language.iso | en | en_US |
dc.publisher | Royal Society of Chemistry | en_US |
dc.rights | Copyright © 2017 The Author(s). Open Access Article. Published on 19 May 2017. This article is Open Access. Licensed under a Creative Commons Attribution 3.0 Unported Licence. | - |
dc.rights.uri | https://creativecommons.org/licenses/by/3.0/ | - |
dc.title | Structure and luminescence analyses of simultaneously synthesised (Lu1-xGdx)2O2S:Tb(3+) and (Lu1-xGdx)2O3:Tb(3+) | en_US |
dc.type | Article | en_US |
dc.identifier.doi | https://doi.org/10.1039/c7dt00862g | - |
dc.relation.isPartOf | Dalton transactions (Cambridge, England : 2003) | - |
pubs.publication-status | Published | - |
dc.identifier.eissn | 1477-9234 | - |
dc.rights.holder | The Author(s) | - |
Appears in Collections: | Wolfson Centre for Sustainable Materials Development and Processing |
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