2022年9月1日 · In this paper, NaErF 4:40%Tm@NaYF 4, a high efficient red UCNPs with R/G ratio (6.86), is first utilized as an optical thermometer, accomplished through the fluorescence …

2020年9月4日 · In order to enhance the green emission intensities used for temperature sensing applications, in this study a β-NaYF 4:Er 3+,Yb 3+ nanoparticles coated with NaYF 4 shell layer are presented....

2020年12月1日 · It is demonstrated that PAA ligand played an important role in guiding the direct growth of NaGdF 4:Ce 3+,Eu 3+ shell onto the surface of NaYF 4:Yb 3+,Tm 3+ parent microtubes.

2023年2月1日 · In this paper, water-soluble NaYF 4:Yb 3+ /Tm 3+ @NaYF 4@β-CD upconversion nanoparticles were successfully prepared by the solvothermal method. The physical phase and morphology were analyzed by XRD and TEM, which showed that the material is well crystallized and has uniform particle size.

2024年1月10日 · 本文选择六方相β-NaYF4:Yb,Tm和六方相Cs4PbBr6构建UPNCs/MHPs核壳结构。 它们晶体结构的相似性促进了Cs4PbBr6在β-NaYF4纳米晶体表面的异质外延生长，从而形成了高质量的β-NaYF4:Yb,Tm/Cs4PbBr6核/壳纳米晶。

The phase evolution of as-prepared NaYF4:Yb,Er upconversion nanoparticles (UCNPs) with a metastable cubic structure is studied based on in situ heating experiments via transmission electron...

NaYF 4, which is the emblematic compound for up-conversion, is known to exist in two different polymorphs: cubic -NaYF 4 and hexagonal -NaYF 4. The impact of the host crystal on optical properties is directly evidenced by the poor emission properties of the -NaYF 4 as compared to the -NaYF 4 [12].

Transmission electron microscopy (TEM) results show that all prepared nanocrystals are well-crystallized with a hexagonal phase and have a desirable size distribution. The particle size increases after shell coating as shown in TEM images; however, it changes a little for samples with different sensitizer contents in the shell.

通过 TEM 、 SEM 、 XRD 、 FTIR 、光纤光谱和 Zeta电位 等表征手段提出了多巴胺修饰NaYF4∶Yb，Er的作用机理，多巴胺通过与UCNPs表面的CTAB间的静电吸附作用粘附在UCNPs表面。

2022年3月8日 · NaYF 4 is one of the most widely used host lattices for UCNPs and is generally considered to yield the most efficient inorganic upconverting crystalline materials 7 with commonly assumed...