Compositional and structural dependence of up-converting rare earth fluorides obtained through EDTA assisted hydro/solvothermal synthesis

The gadolinium effect on crystallization behavior and luminescence of β‐NaYF4:Yb,Er phase

“…This is due to existence of two independent cation sites for dopant ions accommodation which quadruples the number of possible Yb 3+ to Er 3+ energy‐transfer processes and increases the probability of efficient radiative decays . This fact is a challenge, because during the syntheses of nanoparticles through soft chemistry methods, cubic phase usually prevails . It was shown that the manner of NaYF 4 :RE synthesis, as well as the used precursors, influence the morphology and the crystal structure of the final product.…”

One-step synthesis of amino-functionalized up-converting NaYF4:Yb,Er nanoparticles forin vitrocell imaging

“…Therefore, green and red emissions were obtained simultaneously through two-photon UC processes. Furthermore, due to the enhanced non-radiative relaxation of 4 I 11/2 / 4 I 13/2 in nanocrystals 16,31 which proceeds to the direct population of 4 F 9/2 level emission of red/orange light (dened by CIE 0.59, 0.41) was observed by bare eyes at room temperature. Photostability of amino-functionalized up-converting NaYF 4 :Yb,Er nanoparticles emission was also traced during 1 h, Fig.…”

“…14 Under the guidance of the same concept we have shown that PEG, PVP and EDTA capped NaYF 4 :Yb,Er nano-and micro-particles could be easily obtained in a controlled manner through tuning of hydro/ solvothermal processing conditions. 15,16 In this study, amino-functionalized NaYF 4 :Yb,Er nanoparticles with a high degree of size uniformity and efficient upconversion were prepared through solvothermal treating of rare earth nitrates in the presence of chitosan (CS). Chitosan is a linear polysaccharide composed of randomly distributed b-linked D-glucosamine and N-acetyl-D-glucosamine.…”

NaYF4 Microstructure, beyond Their Well-Shaped Morphology

“…The impact of the host crystal on optical properties is directly evidenced by the poor emission properties of the α-NaYF 4 as compared to the β-NaYF 4 [12]. As revealed by a literature survey, the exact structure of the hexagonal β-NaYF 4 phase is not so clear [13,14,15,16,17] since three slightly different crystalline structures have been reported. The list of all samples discussed in this work and the experimental conditions for their synthesis is provided on Table 1.…”