Hydrothermal Synthesis and Luminescence Properties of Monodisperse Spherical CaF2 and CaF2:Ln3+ (Ln = Eu, Tb, Ce/Tb) Microcrystals
International Journal of Materials Science and Applications
Volume 5, Issue 2, March 2016, Pages: 54-60
Received: Apr. 8, 2016; Published: Apr. 9, 2016
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Xiaohong Yang, School of Chemistry and Chemical Engineering, Southwest University, Chongqing, China
Jingjing Cao, School of Chemistry and Chemical Engineering, Southwest University, Chongqing, China
Shanshan Hu, School of Chemistry and Chemical Engineering, Southwest University, Chongqing, China
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Spherical CaF2 and CaF2:Ln3+ (Ln = Eu, Tb, Ce/Tb) with tunable particle size (about 2.5 µm) have been synthesized by one-step facile and effective hydrothermal method. The spherical structure was highly uniform and well-dispersed. It was found that reaction time, pH value, and reaction temperature have important effects on the controlled synthesis of spherical CaF2. The samples were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM) and scanning electron microscopy (SEM), photo-luminescence (PL) and luminescence decay curve. Under UV excitation, the CaF2:Eu3+ showed the red emission (5D07FJ = 0, 1, 2, 3) and the CaF2:Tb3+ presented the green emission (5D47FJ = 6, 5, 4, 3), respectively. Furthermore, Ce3+/Tb3+ co-doped CaF2 showed efficient energy transfer from Ce3+ to Tb3+, which presented strong green photo-luminescence of Tb3+. Due to excellent luminescent properties, the obtained samples can be used in many fields, such as light display systems, optoelectronic devices and biological imaging.
CaF2, Hydrothermal Synthesis, Ce→Tb Energy Transfer, Spherical, Luminescence Properties
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Xiaohong Yang, Jingjing Cao, Shanshan Hu, Hydrothermal Synthesis and Luminescence Properties of Monodisperse Spherical CaF2 and CaF2:Ln3+ (Ln = Eu, Tb, Ce/Tb) Microcrystals, International Journal of Materials Science and Applications. Vol. 5, No. 2, 2016, pp. 54-60. doi: 10.11648/j.ijmsa.20160502.14
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