NDLI: Sacrificial conversion of layered rare-earth hydroxide (LRH) nanosheets into $(Y_{1−x}Eu_{x})PO_{4}$ nanophosphors and investigation of photoluminescence

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Wang, Zhihao Li, Xiaodong Sun, Xudong Zhu, Qi Li, Ji-guang
Description	Author Affiliation: Wang Z ( Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education), School of Materials Science and Engineering, Northeastern University, Shenyang, Liaoning 110819, China. li.jiguang@nims.go.jp.); Li JG ( Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education), School of Materials Science and Engineering, Northeastern University, Shenyang, Liaoning 110819, China. li.jiguang@nims.go.jp and Advanced Materials Processing Unit, National Institute for Materials Science, Namiki 1-1,); Zhu Q ( Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education), School of Materials Science and Engineering, Northeastern University, Shenyang, Liaoning 110819, China. li.jiguang@nims.go.jp.); Li X ( Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education), School of Materials Science and Engineering, Northeastern University, Shenyang, Liaoning 110819, China. li.jiguang@nims.go.jp.); Sun X ( Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education), School of Materials Science and Engineering, Northeastern University, Shenyang, Liaoning 110819, China. li.jiguang@nims.go.jp.)
Abstract	Ultra-thin nanosheets (2–6 nm) of the $(Y_{1−x}Eu_{x})_{2}(OH)_{5}NO_{3}·nH_{2}O$ layered rare-earth hydroxide (LRH), directly crystallized without exfoliation were employed for the first time as a sacrificial precursor to synthesize $(Y_{1−x}Eu_{x})PO_{4}$ orthophosphate red phosphors via nano-conversion, and anion exchange of both the hydroxyls and $NO_{3}^{−}$ in the LRH with the phosphate ions from diammonium hydrogen phosphate $((NH_{4})_{2}HPO_{4})$ is discussed. Detailed characterization of the materials was performed by the combined techniques of XRD, FTIR, TG/DSC, FE-SEM, HR-TEM, and photoluminescence spectroscopy. The $(Y_{1−x}Eu_{x})PO_{4}$ phosphors, with crystallite sizes of up to ∼20 nm, were found to exhibit stronger $^{5}D_{0}$ → $^{7}F_{2}$ (621 nm) than $^{5}D_{0}$ → $^{7}F_{1}$ (595 nm) emissions under charge transfer excitation (236 nm) owing to the nano-size effect. The optimal $Eu^{3+}$ content was determined to be ∼10 at% (x = 0.10), and concentration quenching of luminescence was analyzed to result from exchange interactions. The effects of the $Eu^{3+}$ content and annealing temperature on the structural features and luminescence properties of the $(Y_{1−x}Eu_{x})PO_{4}$ nanophosphors were discussed in detail, including emission intensity, the asymmetry factor of luminescence, fluorescence lifetime, and CIE chromaticity coordinates.
ISSN	14779226
Issue Number	12
Journal	Dalton Trans.
Volume Number	45
e-ISSN	13645447
Language	English
Publisher	Royal Society of Chemistry
Publisher Date	2016-03-28
Publisher Place	Great Britain (UK)
Access Restriction	Subscribed
Subject Keyword	Chemistry
Content Type	Text
Resource Type	Article
Subject	Inorganic Chemistry

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