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dc.contributor.authorTsai, Yi-Ting
dc.contributor.authorChiang, Chang-Yang
dc.contributor.authorZhou, Wuzong
dc.contributor.authorLee, Jyh-Fu
dc.contributor.authorSheu, Hwo-Shuenn
dc.contributor.authorLiu, Ru-Shi
dc.date.accessioned2016-07-09T23:31:16Z
dc.date.available2016-07-09T23:31:16Z
dc.date.issued2015-07-22
dc.identifier.citationTsai , Y-T , Chiang , C-Y , Zhou , W , Lee , J-F , Sheu , H-S & Liu , R-S 2015 , ' Structural ordering and charge variation induced by cation substitution in (Sr,Ca)AlSiN 3 :Eu phosphor ' Journal of the American Chemical Society , vol. 137 , no. 28 , pp. 8936-8939 . DOI: 10.1021/jacs.5b06080en
dc.identifier.issn0002-7863
dc.identifier.otherPURE: 207296762
dc.identifier.otherPURE UUID: 07b4dbab-f3c4-4be3-bd9c-6c50f08ee305
dc.identifier.otherScopus: 84937719410
dc.identifier.urihttp://hdl.handle.net/10023/9103
dc.identifier.urihttp://pubs.acs.org/doi/suppl/10.1021/jacs.5b06080en
dc.descriptionThis work was supported by the Ministry of Science and Tech-nology of Taiwan (Contract No. MOST 101-2113-M-002-014-MY3) and Mitsubishi Chemical Group, Science and Technology Research Center Inc., Japan. We also appreciate to the discussion by Dr. Kyota Ueda and Mr. Fumitaka Yoshimura.en
dc.description.abstractNitride phosphors which are suitable for white light-emitting diode applications. In this study, the structure of phosphor has been modified through cation substitution to induce charge variation and a rearrangement of neighboring nitride clusters, and consequently enhance its luminescent behavior. Substitution of Ca2+ by Sr2+ cations expanded the lattice volume and the b-c plane, but shortened the distance between the layers along the a axis. Lattice distortion of the framework introduced high-coordination sites in the Sr/Eu centers and adequate space, thereby facilitating charge variation of activators under reduced atmosphere, as detected through X-ray absorption near-edge structure spectroscopy. As such, the photoluminescent intensity of the phosphors increased by more than 10% and a blue shift occurred. The microstructures of the samples were also analyzed using high-resolution transmission electron microscopy. Cation substitution induced a special change in the anion environment, as indicated in the solid-state Raman spectra. Moreover, a typical ordering variations in the SiN4 and AlN4 clusters are generated in the lattice. Meanwhile, neighbor sequence of (Si/Al)N4 around the divalent centers were observed through solid-state nuclear magnetic resonance spectroscopy. The modified ordering distribution resulted in a rigid structure and improved the thermal quenching behavior. Thermal stability has been enhanced by 10% at 473 K when x = 0.9 in SrxCa0.993-xAlSiN3:Eu2+0.007 compared with that at x = 0. This study promotes the research of neighbor sequence for selective tetrahedral sites such as Li, Mg, Al, Si coordinated by N atoms contact with cation sites.en
dc.language.isoeng
dc.relation.ispartofJournal of the American Chemical Societyen
dc.rightsCopyright © 2015 American Chemical Society. This document is the Accepted Manuscript version of a Published Work that appeared in final form in Journal of the American Chemical Society, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see http://pubs.acs.org/doi/full/10.1021/jacs.5b06080en
dc.subjectQD Chemistryen
dc.subjectNDASen
dc.subject.lccQDen
dc.titleStructural ordering and charge variation induced by cation substitution in (Sr,Ca)AlSiN3:Eu phosphoren
dc.typeJournal articleen
dc.description.versionPostprinten
dc.contributor.institutionUniversity of St Andrews. School of Chemistryen
dc.contributor.institutionUniversity of St Andrews. Centre for Higher Education Researchen
dc.contributor.institutionUniversity of St Andrews. EaSTCHEMen
dc.identifier.doihttps://doi.org/10.1021/jacs.5b06080
dc.description.statusPeer revieweden
dc.date.embargoedUntil10-07-20


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