Crystal structure, morphology and luminescent properties of rare earth ion-doped SrHPO₄ nanomaterials

王梦楠^1,2，田博士¹，岳丹^1,2，鲁伟³，于明丽¹，李春阳¹，李庆锋¹，王振领¹

1. The Key Laboratory of Rare Earth Functional Materials and Applications, Zhoukou Normal University2. The College of Chemistry and Molecular Engineering, Zhengzhou University3. Department of Applied Physics and University Research Facility in Materials Characterization and Device Fabrication, The Hong Kong Polytechnic University

摘 要：Undoped and rare earth ions（Eu3+, Ce3+, Tb3+） doped β-Sr HPO4 nanomaterials were successfully prepared by a facile hydrothermal method. The crystal structure, morphology and luminescent properties were characterized by X-ray powder diffraction（XRD）, scanning electron microscopy（SEM）, transmission electron microscopy（TEM）, photoluminescence（PL） spectra and luminescence decay curves. The results indicated that the undoped and rare earth ions doped Sr HPO4 nanomaterials（the doping concentration was not above 7%） were well crystallized, with the same crystal structure（β-Sr HPO4）. Nevertheless, the doping of rare earth ions could lead to the changing of morphology from nanoflakes to nanocrystals. Under the excitation of UV light, rare earth ions（Eu3+, Ce3+, Tb3+） doped β-Sr HPO4 nanocrystals exhibited the characteristic emission of Eu3+, Ce3+ and Tb3+ ions, respectively. The luminescence decay curves of β-Sr HPO4:Eu3+ and β-Sr HPO4:Ce3+,Tb3+ nanocrystals conformed to the double exponential fluorescence decay, and the average lifetimes were 1.14 and 4.12 ms, respectively. The luminescence decay curve of β-Sr HPO4:Ce3+ was fitted into a single exponential function, and the lifetime was about 0.78 ns.

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