| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 5378466 | Chemical Physics Letters | 2017 | 6 Pages |
â¢The crystal structure of KLa9(GeO4)6O2 and KLa8.37Eu0.63(GeO4)6O2 is reported.â¢The electronic structure of the compounds has been resolved using DFT calculations.â¢The luminescence properties of KLa8.37Eu0.63(GeO4)6O2 have been studied.
New KLa9(GeO4)6O2 and KLa8.37Eu0.63(GeO4)6O2 germanates with the apatite structure type (space group P63/m, ZÂ =Â 1) have been synthesized by the sol-gel method using ethylenediaminetetraacetic acid as a precursor and characterized by powder X-ray diffraction, scanning electron microscopy and diffuse reflectance spectroscopy. Density functional theory calculations reveal that KLa9(GeO4)6O2 is a direct bandgap material, and near-UV excitation leads to the electronic transitions from the O2p- orbitals to the Lad- and K4s- states. Photoluminescence measurements of the Eu3+-doped sample indicate emission in the visible spectral range corresponding to the characteristic transitions from the excited 5D0 and 5D1 levels in europium ion.
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