Cargando…

Simultaneous morphology manipulation and upconversion luminescence enhancement of β-NaYF(4):Yb(3+)/Er(3+) microcrystals by simply tuning the KF dosage

A strategy has been adopted for simultaneous morphology manipulation and upconversion luminescence enhancement of β-NaYF(4):Yb(3+)/Er(3+) microcrystals by simply tuning the KF dosage. X-ray power diffraction (XRD), field emission scanning electron microscopy (FE-SEM), transmission electron microscop...

Descripción completa

Detalles Bibliográficos
Autores principales: Ding, Mingye, Chen, Daqin, Yin, Shilong, Ji, Zhenguo, Zhong, Jiasong, Ni, Yaru, Lu, Chunhua, Xu, Zhongzi
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group 2015
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4522666/
https://www.ncbi.nlm.nih.gov/pubmed/26235808
http://dx.doi.org/10.1038/srep12745
Descripción
Sumario:A strategy has been adopted for simultaneous morphology manipulation and upconversion luminescence enhancement of β-NaYF(4):Yb(3+)/Er(3+) microcrystals by simply tuning the KF dosage. X-ray power diffraction (XRD), field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and photoluminescence spectra (PL) were used to characterize the samples. The influence of molar ratio of KF to Y(3+) on the crystal phase and morphology has been systematically investigated and discussed. 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 the different crystal faces. The possible formation mechanism has been proposed on the basis of a series of time-dependent experiments. More importantly, the upconversion luminescence of β-NaYF(4):Yb(3+)/Er(3+) was greatly enhanced by increasing the molar ratio of KF to RE(3+) (RE = Y, Yb, Er), which is attributed to the distortion of local crystal field symmetry around lanthanide ions through K(+) ions doping. This synthetic methodology is expected to provide a new strategy for simultaneous morphology control and remarkable upconversion luminescence enhancement of yttrium fluorides, which may be applicable for other rare earth fluorides.