10.1021/jp305882j.s001
Xiaojie Xue
Xiaojie
Xue
Zhongchao Duan
Zhongchao
Duan
Takenobu Suzuki
Takenobu
Suzuki
Rajanish
N. Tiwari
Rajanish
N.
Tiwari
Masamichi Yoshimura
Masamichi
Yoshimura
Yasutake Ohishi
Yasutake
Ohishi
Luminescence Properties of α‑NaYF<sub>4</sub>:Nd<sup>3+</sup> Nanocrystals Dispersed
in Liquid: Local Field Effect Investigation
American Chemical Society
2012
sample
field correction factor
emission quantum efficiency
803 nm laser
nanocrystal
solvent
18 nm
particle size decreases
cavity model
NaYF
quantum efficiencies
colloid
2012-10-25 00:00:00
Journal contribution
https://acs.figshare.com/articles/journal_contribution/Luminescence_Properties_of_NaYF_sub_4_sub_Nd_sup_3_sup_Nanocrystals_Dispersed_in_Liquid_Local_Field_Effect_Investigation/2474620
Pure α-NaYF<sub>4</sub>:Nd<sup>3+</sup> nanocrystals
of various sizes from 6 to 18 nm were successfully synthesized by
a solvothermal method. By controlling the doping concentration of
Nd<sup>3+</sup> ions, α-NaYF<sub>4</sub> nanocrystals with different
quantum efficiencies were prepared. The monodispersed oleate-capped
nanocrystals were dispersed in several nonpolar solvents to obtain
stable colloids. Under the excitation by an 803 nm laser, luminescent
decay curves of the colloids were measured. The relationship between
the emission lifetimes of samples and the effective refractive indices
of solvents was studied. The local field correction factor for the
samples of 18 nm with different quantum efficiencies is expressed
by the real cavity model which indicates the local field effect is
independent of the emission quantum efficiency. When the particle
size decreases to 6 nm, the preferred model alters from the real cavity
model to the virtual cavity model which might be derived from changing
of polarizability density.