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    Crystal phase transition in LixNa1-xGdF4 solid solution nanocrystals - Tuning of optical properties

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    Type
    Article
    Authors
    Bański, Mateusz
    Afzaal, Mohammad
    Cha, Dong Kyu
    Wang, X.
    Tan, Hua
    Misiewicz, Jan J.
    Podhorodecki, Artur P.
    KAUST Department
    Advanced Nanofabrication, Imaging and Characterization Core Lab
    Analytical Chemistry Core Lab
    Analytical Core Lab
    Computational Bioscience Research Center (CBRC)
    Imaging and Characterization Core Lab
    Solids
    Date
    2014-09-29
    Permanent link to this record
    http://hdl.handle.net/10754/563258
    
    Metadata
    Show full item record
    Abstract
    The influence of precursor composition on the crystallization of LixNa1-xGdF4 is investigated and discussed. Nanocrystals are prepared from the thermal decomposition of trifluoroacetates in the presence of trioctylphosphine oxide to provide control over particle size. A crystal phase transition from hexagonal to cubic and to tetragonal is observed by increasing lithium trifluoroacetate (Li-TFA) in the solution. Controlling the composition of LixNa1-xGdF4 nanocrystals results in modified crystal field symmetry and emission properties from doped europium (Eu3+) ions. We report that for lithium (Li+) substitution <15%, the hexagonal crystal field is preferred, while the Eu3+ emission is already tuned, whereas at higher Li+ substitution, a phase change takes place and the number of crystalline matrix defects increases which is reflected in the optical properties of Eu3+. From Eu3+ emission properties, the optimum Li+ content is determined to be ∼6.2% in the prepared LixNa1-xGdF4 nanocrystals.
    Citation
    Banski, M., Afzaal, M., Cha, D., Wang, X., Tan, H., Misiewicz, J., & Podhorodecki, A. (2014). Crystal phase transition in LixNa1−xGdF4solid solution nanocrystals – tuning of optical properties. J. Mater. Chem. C, 2(46), 9911–9917. doi:10.1039/c4tc01539h
    Sponsors
    The authors would like to thank the National Centre for Research and Development for their financial support under the LIDER project no. 014/L-2/10. MB would like to acknowledge The Iuventus Plus program (no. IP2011 001271) and Foundation for Polish Science (FNP) "Start" program for the financial support. MA wishes to acknowledge NSTIP strategic technologies program number (12-ENE3204-04) for the financial support.
    Publisher
    Royal Society of Chemistry (RSC)
    Journal
    J. Mater. Chem. C
    DOI
    10.1039/c4tc01539h
    ae974a485f413a2113503eed53cd6c53
    10.1039/c4tc01539h
    Scopus Count
    Collections
    Articles; Analytical Chemistry Core Lab; Imaging and Characterization Core Lab; Computational Bioscience Research Center (CBRC)

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