Long Chen,Yang Wu,Heyong Huo,Bin Tang,Yuhua Fu,Xiujie Hu,Chenghua Sun,Shuyun Zhou
Rare-earth phosphor materials have been investigated for several decades due to their high X-ray absorption coefficient and emission efficiency, but these materials tend to reveal lower resolution and packing density when fabricated in bulk. In this work, we investigated the BaFBr:Eu2+ micro/submicro/nano-crystal phosphor material prepared using a precipitation method, and we demonstrate the dependence of the optical properties of these phosphors on the annealing temperature and Eu2+ concentration. The optimum preparation conditions were determined to be an annealing temperature of 600 °C for 2 h and an Eu2+ doping concentration of 0.1 mol%, achieving a quantum yield of 53.19%. Furthermore, the average lifetime is 669 ns. In comparison with typical bulk phosphors, the shape and size distribution of the crystallites, which is about 100 nm on average, may improve the resolution and enhance the fluorescence performance. The results of this study thus offer a new strategy for the development of highly efficient storage phosphors.
Qinghua Liang,Yao Shi,Wangjing Ma,Zhi Li,Xinmin Yang
Uniform square-like BaFBr:Eu2+ microplates were successfully fabricated via a simple water/oil emulsion method. Various characterization techniques such as X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), Raman spectroscopy, Scanning electron microscopy (SEM) and Transition electron microscopy (TEM) were employed to examine the phase, size, morphology, and structure of the products. It was found that the morphology and size of products were strongly dependent on the reaction parameters, such as the ratio of reactants, the reaction time and the reaction temperature. The length and thickness of these square-like BaFBr:Eu2+ microplates can be tuned by adjusting the reaction time and temperature. Well-dispersed cuboctahedron and corner cut cuboid-like BaFBr:Eu2+ particles were produced when the reaction temperature was increased above 60 °C. A possible formation mechanism of the products was discussed based on the time and temperature-dependent experimental results. The optical properties were characterized by photoluminescence (PL) spectroscopy as well as kinetic decay. Eu2+-doped dependent luminescent intensity was investigated in detail. The prepared BaFBr:Eu2+ phosphors are considered promising materials for fluorescent applications.
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