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Issue 13, 2018
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Facile synthesis of monodisperse SrAl2O4:Eu2+ cage-like microspheres with an excellent luminescence quantum yield

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Abstract

Commercial LED phosphors are usually prepared by a conventional solid-state reaction method and a subsequent ball milling process, which often results in non-uniform size distributions, irregular shape and impurity contamination of the phosphors. In this work, the SrAl2O4:Eu2+ cage-like microspheres with a uniform size distribution and excellent photoluminescence (PL) quantum yield (QY) are prepared by an epoxide-driven sol–gel route and subsequent heat treatment in a reducing atmosphere. This unique cage-like microstructure not only makes better use of the excited light but also significantly increases the PL quenching concentration of the Eu2+ ions. The optimum internal QY of the SrAl2O4:Eu2+ cage-like microspheres is measured to be up to 94.94%, much higher than the highest internal QY (55%) of the SrAl2O4:Eu2+ phosphors reported so far. The approach may be readily applied to prepare other lanthanide ions doped cage-like microspheres, implying a new route for preparing highly efficient PL phosphors with regular shape and uniform particle size.

Graphical abstract: Facile synthesis of monodisperse SrAl2O4:Eu2+ cage-like microspheres with an excellent luminescence quantum yield

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Publication details

The article was received on 15 Nov 2017, accepted on 18 Feb 2018 and first published on 22 Feb 2018


Article type: Paper
DOI: 10.1039/C7TC05203K
Citation: J. Mater. Chem. C, 2018,6, 3346-3351
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    Facile synthesis of monodisperse SrAl2O4:Eu2+ cage-like microspheres with an excellent luminescence quantum yield

    J. Wan, Y. Zhang, Y. Wang, R. Ma, Y. Wu, X. Qiao and X. Fan, J. Mater. Chem. C, 2018, 6, 3346
    DOI: 10.1039/C7TC05203K

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