β-NaYF 4 and β-NaYF 4 :Eu 3+ Microstructures: Morphology Control and Tunable Luminescence Properties
2009; American Chemical Society; Volume: 113; Issue: 6 Linguagem: Inglês
10.1021/jp8101628
ISSN1932-7455
AutoresChunxia Li, Cuimiao Zhang, Zhiyao Hou, Lili Wang, Zewei Quan, Hongzhou Lian, Jun Lin,
Tópico(s)Perovskite Materials and Applications
Resumoβ-NaYF4 hexagonal microprisms and microrods with different aspect ratios have been prepared via a simple hydrothermal route. X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and photoluminescence (PL) spectra as well as kinetic decays were used to characterize the samples. The influences of reaction temperature and the molar ratio of NaF to Y3+ on the crystal phases and shapes of final products have been studied in detail. The aspect ratios of products increase gradually with the increase of reaction temperature and NaF/Y3+ molar ratio. The growth mechanisms of crystals prepared under the different conditions are presented systematically. More importantly, the systematical investigation on the luminescence properties of β-NaYF4:xEu3+ (x = 0.5, 1, 2, 3, 5, and 10 mol %) with hexagonally microprismatic morphology shows the characteristic emissions of Eu3+ (5DJ−7FJ′, J, J′ = 0, 1, 2, 3). Under the excitation of single wavelength light of 397 nm, the luminescence colors of the corresponding products can be tuned feasibly from bluish white to yellow to red by changing the doping concentration of Eu3+. This merit of multicolor emissions in the visible region endows this kind of materials with potential application in the field of light display systems, lasers, and optoelectronic devices.
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