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dc.contributor.authorWako, Ali Halake
dc.contributor.authorDejenea, F. B.
dc.contributor.authorSwart, H. C.
dc.date.accessioned2016-10-18T11:10:44Z
dc.date.available2016-10-18T11:10:44Z
dc.date.issued2016-03
dc.identifier.citationLuminescence 2016; 31: 1313–1320en_US
dc.identifier.urihttp://hdl.handle.net/123456789/977
dc.descriptionThis research was jointly funded by the South African Research Chairs Initiative of the Department of Science and Technology, the National Research Foundation of South Africa and University of the Free State Cluster Fund.en_US
dc.description.abstractABSTRACT: The structural and optical properties of commercially obtained Y3Al5O12:Ce3+ phosphor were investigated by replacing Al3+ with Ga3+ and Y3+ with Gd3+ in the Y3Al5O12:Ce3+ structure to form Y3(Al,Ga)5O12:Ce3+ and (Y,Gd)3Al5O12:Ce3+. X-Ray diffraction (XRD) results showed slight 2-theta peak shifts to lower angles when Ga3+ was used and to higher angles when Gd3+ was used, with respect to peaks from Y3Al5O12:Ce3+ and JCPDS card no. 73–1370. This could be attributed to induced crystal-field effects due to the different ionic sizes of Ga3+ and Gd3+ compared with Al3+ and Y3+. The photoluminescence (PL) spectra showed broad excitation from 350 to 550 nm with a maximum at 472 nm, and broad emission bands from 500 to 650 nm, centred at 578 nmfor Y3Al5O12:Ce3+ arising fromthe 5d→4f transition of Ce3+. PL revealed a blue shift for Ga3+ substitution and a red shift for Gd3+ substitution. UV–Vis showed two absorption peaks at 357 and 457 nm for Y3Al5O12:Ce3+, with peaks shifting to 432 nm for Ga3+ and 460 nm for Gd3+ substitutions. Changes in the trap levels or in the depth and number of traps due to Ce3+ were analysed using thermoluminescence (TL) spectroscopy. This revealed the existence of shallow and deep traps. It was observed that Ga3+ substitution contributes to the shallowest traps at 74 °C and fewer deep traps at 163 °C, followed by Gd3+ with shallow traps at 87 °C and deep traps at 146 °C. Copyright © 2016 John Wiley & Sons, Ltd.en_US
dc.language.isoenen_US
dc.publisherJohn Wiley & Sonsen_US
dc.subjectY3(Al,Ga)5O12:Ce3+en_US
dc.subject(Y,Gd)3Al5O12:Ce3+ substitutionen_US
dc.subjectthermoluminescenceen_US
dc.subjecttrap depthsen_US
dc.titleEffect of Ga3+ and Gd3+ ions substitution on the structural and optical properties of Ce3+-doped yttrium aluminium garnet phosphor nanopowdersen_US
dc.typeArticleen_US


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