2021年1月5日 · NaYF 4 shells with tunable morphologies including long-rod, short-rod, and quasi-sphere are grown on identical NaYbF 4 core nanoparticles by controlled injection of acetate or trifluoroacetate precursors. Mechanistic investigations reveal that anisotropic interfacial strain accounts for the preferential growth of shell layers along the c -axis.

A comprehensive strategy has been developed to construct nano-sized homogeneous and heterogeneous core/shell structures of NaYF4 host. Synthesis conditions of cubic phase/α-NaYF4 and hexagonal phase/β-NaYF4 are discussed.

Hexagonal-phase core−shell-structured NaYF 4:Yb,Tm@β-NaYF 4:Yb,Er and β-NaYF 4:Yb,Tm@β-NaYF 4:Yb,Er@β-NaYF 4:Yb,Tm nanocrystals were synthesized by a seeded growth approach. β-NaYF 4:Yb,Tm nanocrystals with 20 nm diameter were used as seed crystals to induce the growth of β-NaYF 4:Yb,Er and then β-NaYF 4:Yb,Tm crystals, resulting in …

2020年1月1日 · In this mini review, we have discussed fundamental concepts of NaYF4 host for UC emission. The NaYF4 host has been selected due to its low phonon energy and composition stability. We have also demonstrated that the introduction of core shell and plasmonic nanostructure which has a critical effect on UCL.

2020年9月4日 · The results showed that the synthesized NaYF 4:Er 3+,Yb 3+ @NaYF 4 core–shell nanoparticles have roughly spherical shape, pure hexagonal β phase with core size of about 35 ± 5 nm and shell...

2018年7月11日 · Phase-pure hexagonal lanthanide-doped NaYF 4 nanocrystals possess enhanced luminescence properties due to their low phonon energy and chemical stability compared to their cubic phase counterpart.

2023年2月1日 · Since the maximum absolute sensitivity, maximum relative sensitivity and minimum temperature resolution are determined to be 0.1179 K-1, 2.19 %K −1 and 0.00019 K, respectively, NaYF 4: Yb 3+ /Tm 3+ @NaYF 4@β-CD upconversion nanoparticles are expected to be widely used in the biomedical field due to their feasibility, reliability, non-toxicity an...

Upconversion core/shell nanocrystals with different mean sizes ranging from 15 to 45 nm were prepared via a modified synthesis procedure based on anhydrous rare-earth acetates.

2024年4月13日 · In this study, we conducted the synthesis of core@shell nanoparticles composed of NaYF 4:Ho 3+ /Yb 3+ at the core and NaGdF 4 at the shell and examined their potential as contrast agents for SSOCT and PTOCT imaging.

2021年1月20日 · This study presents a controlled synthesis of NaYbF 4 @NaYF 4 core-shell upconversion nanoparticles using the hot-injection technique. NaYF 4 shells with tunable morphologies including long-rod, short-rod, and quasi-sphere are grown on identical NaYbF 4 core nanoparticles by controlled injection of acetate or trifluoroacetate precursors. Mechanistic investigations reveal that anisotropic ...