2007年9月1日 · X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM), and …

2009年1月20日 · β-NaYF 4 hexagonal microprisms and microrods with different aspect ratios have been prepared via a simple hydrothermal route. X-ray diffraction (XRD), scanning …

2015年4月1日 · The composition and phase purity of the samples were first examined by XRD. Fig. 1 shows XRD patterns of the products synthesized by using NaF as fluoride source and …

2017年1月20日 · To determine the size, shape, and crystallinity of both the NaYF 4 NCs and NaYF 4 @SiO 2 NCs, we used different characterization methods such as transmission …

In this paper, Nd3+-Yb3+-Er3+-doped β-NaYF4 nanocrystals with different Nd3+ concentrations are synthesized, and the luminescence properties of the upconversion nanoparticles (UCNPs) …

1 天前 · A new method of synthesis for NaYF4 is reported. The method involves highly exothermic solid-state metathesis reaction between metal chlorides and NaF. The synthesis is very fast …

Figure 1 shows the XRD patterns of these samples obtained at different molar ratio of KF/Y 3+ as well as standard data of pure hexagonal NaYF 4 phase for comparison. As shown, all crystals...

Plot 1 (JCPDS card No. 28-1192) of the NaYF4 β-phase (hexagonal). 2 – NaYF4 β-phase (hexagonal) freshly made powder baked at 500°C for 1 h; 3 – the same ball milled powder, …

2015年8月3日 · It is found that the molar ratio of KF to Y 3+ can strongly control the morphology of the as-synthesized β-NaYF 4 samples because of the different capping effect of F − ions on …

通过分解稀土的三氟乙酸盐，制备了NaYF4:Eu纳米晶.并通过改变温度合成了具有不同形貌和不同晶型的纳米晶，研究了纳米晶的表面有机配体和纳米晶的晶型对发光性能的影响.