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dc.contributor.authorZhang, X.
dc.contributor.authorZhao, Z.
dc.contributor.authorZhang, X.
dc.contributor.authorCordes, D.B.
dc.contributor.authorWeeks, B.
dc.contributor.authorQiu, B.
dc.contributor.authorMadanan, K.
dc.contributor.authorSardar, D.
dc.contributor.authorChaudhuri, J.
dc.date.accessioned2015-09-08T23:11:16Z
dc.date.available2015-09-08T23:11:16Z
dc.date.issued2015-02
dc.identifier.citationZhang , X , Zhao , Z , Zhang , X , Cordes , D B , Weeks , B , Qiu , B , Madanan , K , Sardar , D & Chaudhuri , J 2015 , ' Magnetic and optical properties of NaGdF 4 :Nd 3+ , Yb 3+ , Tm 3+ nanocrystals with upconversion/downconversion luminescence from visible to the near-infrared second window ' , Nano Research , vol. 8 , no. 2 , pp. 636-648 . https://doi.org/10.1007/s12274-014-0548-2en
dc.identifier.issn1998-0124
dc.identifier.otherPURE: 173633770
dc.identifier.otherPURE UUID: 8b7bcd02-3417-4d78-a14c-ee06db5d4241
dc.identifier.otherScopus: 84923328853
dc.identifier.otherWOS: 000349956600025
dc.identifier.otherORCID: /0000-0002-5366-9168/work/28024013
dc.identifier.urihttp://hdl.handle.net/10023/7423
dc.descriptionThe authors acknowledge the support of the National Science Foundation (NSF) Grant #MRI0922898 for the TEM work. We also thank the support from the Anhui Provincial Natural Science Foundation of China (1308085QA06) and the National Science Foundation Partnership for Research and Education in Materials (NSF-PREM) grant (No. DMR-0934218).en
dc.description.abstractWe have designed and synthesized NaGdF4:Nd3+, Yb3+, Tm3+ magnetic nanophosphors with combined dual-mode downconversion (DC) and upconversion (UC) photoluminescence upon 800 nm excitation. Hexagonal-phase NaGdF4:Nd3+, Yb3+, Tm3+ nanocrystals (NCs) with an average size of 21 nm were synthesized using a solvothermal approach. Nd3+, Yb3+, Tm3+ triple-doped NaGdF4 NCs exhibit a broad range of photoluminescence peaks covering a near infrared first/second window (860–900, 1,000, and 1,060 nm), and visible emission including blue (475 nm), green (520 and 542 nm) and yellow (587 nm) after excitation at 800 nm. A mechanism involving circulation of energy over Gd3+ sublattices as bridge ions and final trapping by the initial activator ions (Nd3+) has been proposed. Penetration depth studies indicate that NIR emission is easily detected even at a large tissue thickness of 10 mm. These paramagnetic nanophosphors demonstrate a large magnetization value of 1.88 emu/g at 20 kOe and longitudinal relaxivity value of 1.2537 mM−1·S−1 as a T 1-weighted magnetic resonance imaging contrast agent. These NaGdF4:Nd3+, Yb3+, Tm3+ NCs are promising for applications in biological and magnetic resonance imaging.
dc.format.extent13
dc.language.isoeng
dc.relation.ispartofNano Researchen
dc.rights© Tsinghua University Press and Springer-Verlag Berlin Heidelberg 2014. The final publication is available at Springer via http://dx.doi.org/10.1007/s12274-014-0548-2en
dc.subjectNear-infrared seconden
dc.subjectWindowen
dc.subjectPhotoluminescenceen
dc.subjectEnergy transferen
dc.subjectNanocrystalsen
dc.subjectQD Chemistryen
dc.subjectNDASen
dc.subject.lccQDen
dc.titleMagnetic and optical properties of NaGdF4:Nd3+, Yb3+, Tm3+ nanocrystals with upconversion/downconversion luminescence from visible to the near-infrared second windowen
dc.typeJournal articleen
dc.description.versionPostprinten
dc.contributor.institutionUniversity of St Andrews. School of Chemistryen
dc.contributor.institutionUniversity of St Andrews. EaSTCHEMen
dc.identifier.doihttps://doi.org/10.1007/s12274-014-0548-2
dc.description.statusPeer revieweden
dc.date.embargoedUntil2015-09-09


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