TY - JOUR
T1 - Synthesis and upconversion luminescence of uniform β-NaYF 4:Yb 3+/Tm 3+ hexagonal nanoplates
AU - Tian, Qijun
AU - Liu, Ning
AU - Qin, Guanshi
AU - Zheng, Kezhi
AU - Zhang, Daisheng
AU - Qin, Weiping
PY - 2011
Y1 - 2011
N2 - Yb 3+ and Tm 3+-codoped hexagonal-phase NaYF 4 powders were prepared by a facile hydrothermal method. The results of X-ray powder diffraction (XRD) and scanning electron microscopy (SEM) showed that the as-prepared powders were well crystallized nanoplates with high sizeuniformity. Under the excitation from a 980 nm laser diode, upconversion (UC) emissions centered at ∼291 nm ( 1I 6 → 3H 6), ∼346 nm ( 1I 6 → 3F 4), ∼361 nm ( 1D 2 → 3H),∼451 nm ( 1D 2 → 3F 4),∼474 nm ( 1G 4→ 3H 4),∼644 nm ( 1G 4→ 3F 4), and ∼799 nm ( 3H 4→ 3H 6) were observed in the sample. Furthermore, the intensity dependence of UC emissions on excitation power was measured. The results indicated that populating the 1I 6, 1D 2, 1G 4, and 3Prof. 4 states were five-photon, four-photon, three-photon, and two-photon UC processes, respectively.
AB - Yb 3+ and Tm 3+-codoped hexagonal-phase NaYF 4 powders were prepared by a facile hydrothermal method. The results of X-ray powder diffraction (XRD) and scanning electron microscopy (SEM) showed that the as-prepared powders were well crystallized nanoplates with high sizeuniformity. Under the excitation from a 980 nm laser diode, upconversion (UC) emissions centered at ∼291 nm ( 1I 6 → 3H 6), ∼346 nm ( 1I 6 → 3F 4), ∼361 nm ( 1D 2 → 3H),∼451 nm ( 1D 2 → 3F 4),∼474 nm ( 1G 4→ 3H 4),∼644 nm ( 1G 4→ 3F 4), and ∼799 nm ( 3H 4→ 3H 6) were observed in the sample. Furthermore, the intensity dependence of UC emissions on excitation power was measured. The results indicated that populating the 1I 6, 1D 2, 1G 4, and 3Prof. 4 states were five-photon, four-photon, three-photon, and two-photon UC processes, respectively.
KW - Hexagonal NaYF
KW - Nanoplates
KW - Rare Earth Ions
KW - Upconversion Luminescence
UR - http://www.scopus.com/inward/record.url?scp=84863119749&partnerID=8YFLogxK
U2 - 10.1166/jnn.2011.5249
DO - 10.1166/jnn.2011.5249
M3 - Article
AN - SCOPUS:84863119749
SN - 1533-4880
VL - 11
SP - 9576
EP - 9579
JO - Journal of Nanoscience and Nanotechnology
JF - Journal of Nanoscience and Nanotechnology
IS - 11
ER -