TY - JOUR
T1 - Synthesis of monodisperse NaYF 4:Yb, Tm@SiO 2 nanoparticles with intense ultraviolet upconversion luminescence
AU - Shi, Feng
AU - Zhai, Xuesong
AU - Zheng, Kezhi
AU - Zhao, Dan
AU - Qin, Weiping
PY - 2011
Y1 - 2011
N2 - In this paper, the NaYF 4:Yb, Tm upconversion (UC) nanoparticles (NPs) were synthesized using a solvothermal approach, and the core-shell structured NaYF 4:Yb, Tm@SiO 2 NPs, coated with a thin layer of SiO 2 on the surface of the NaYF 4:Yb, Tm NPs, were prepared by a typical Stöber method. X-ray diffraction (XRD), transmission electron microscopy (TEM), and luminescence spectroscopy were applied to characterize these samples. The obtained core-shell structured NaYF 4:Yb, Tm@SiO 2 NPs exhibited a perfect spherical morphology with narrow size distribution and smooth surfaces. Under 980 nm excitation, NaYF 4:Yb, Tm and NaYF 4:Yb, Tm@SiO 2 samples showed intense ultraviolet UC luminescence, which originated from the 1D 2 → 3H 6, 1I 6 → 3F 4 transitions of Tm 3+. These NPs have great potential for applications as fluorescent labels, imaging probes, optical storage, photodynamic therapy (PDT) in deep tissue, and solid-state lasers.
AB - In this paper, the NaYF 4:Yb, Tm upconversion (UC) nanoparticles (NPs) were synthesized using a solvothermal approach, and the core-shell structured NaYF 4:Yb, Tm@SiO 2 NPs, coated with a thin layer of SiO 2 on the surface of the NaYF 4:Yb, Tm NPs, were prepared by a typical Stöber method. X-ray diffraction (XRD), transmission electron microscopy (TEM), and luminescence spectroscopy were applied to characterize these samples. The obtained core-shell structured NaYF 4:Yb, Tm@SiO 2 NPs exhibited a perfect spherical morphology with narrow size distribution and smooth surfaces. Under 980 nm excitation, NaYF 4:Yb, Tm and NaYF 4:Yb, Tm@SiO 2 samples showed intense ultraviolet UC luminescence, which originated from the 1D 2 → 3H 6, 1I 6 → 3F 4 transitions of Tm 3+. These NPs have great potential for applications as fluorescent labels, imaging probes, optical storage, photodynamic therapy (PDT) in deep tissue, and solid-state lasers.
KW - Luminescence
KW - NaYF
KW - Nanoparticles
KW - Upconversion
UR - http://www.scopus.com/inward/record.url?scp=84857169575&partnerID=8YFLogxK
U2 - 10.1166/jnn.2011.5248
DO - 10.1166/jnn.2011.5248
M3 - Article
AN - SCOPUS:84857169575
SN - 1533-4880
VL - 11
SP - 9912
EP - 9915
JO - Journal of Nanoscience and Nanotechnology
JF - Journal of Nanoscience and Nanotechnology
IS - 11
ER -