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Issue 41, 2015
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Hydrothermal synthesis and photoluminescence properties of Ca9Eu(PO4)7 nanophosphors

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Abstract

The red-emitting Ca9Eu(PO4)7 nanophosphors have been successfully synthesized by a facile hydrothermal method. X-ray diffraction (XRD), photoluminescence (PL) spectroscopy, GSAS structural refinement and scanning electron microscopy (SEM) were used to characterize the materials. Rietveld refinement of powder X-ray diffraction patterns of Ca9Eu(PO4)7 demonstrated that the structure of Ca9Eu(PO4)7 consisted of [PO4] tetrahedra. Ca/Eu atoms filled the space between the tetrahedral groups with Eu3+ ions distributed randomly on three individual Ca crystallographic sites. The major red emission peak located at 616 nm under 397 nm excitation attributed to the electric dipole transition 5D07F2 of Eu3+ was a parity forbidden f–f configuration transition, which would only occur when Eu3+ occupied lattice sites without inversion symmetry. Introducing Gd, La, and Y ions into samples made luminescence properties of Ca9Eu1−xLnx(PO4)7 (Ln = Gd, La, Y) phosphors decrease. pH value plays a key role in the formation of Ca9Eu(PO4)7 nanophosphor morphology. With increasing pH in the initial reaction solution, the morphology of samples changed from rod to sphere and their aspect ratio also decreased. Different morphologies have different photoluminescence properties, and samples prepared at pH 7 manifested better photoluminescence properties relative to other samples. This novel red-emitting phosphor could be applied in white light-emitting diodes.

Graphical abstract: Hydrothermal synthesis and photoluminescence properties of Ca9Eu(PO4)7 nanophosphors

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Publication details

The article was received on 03 Jul 2015, accepted on 04 Sep 2015 and first published on 04 Sep 2015


Article type: Paper
DOI: 10.1039/C5CE01289A
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CrystEngComm, 2015,17, 7888-7895

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    Hydrothermal synthesis and photoluminescence properties of Ca9Eu(PO4)7 nanophosphors

    J. Sun, X. Mi, L. Lei, X. Pan, S. Chen, Z. Wang, Z. Bai and X. Zhang, CrystEngComm, 2015, 17, 7888
    DOI: 10.1039/C5CE01289A

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