Open AccessParticle size dependence of the dynamic photophysical properties of NaYF_4:Yb, Er nanocrystals
Author(s) -
Shuang Fang Lim,
William S. Ryu,
Robert H. Austin
Publication year - 2010
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.18.002309
Subject(s) - nanocrystal , materials science , particle size , luminescence , surface area to volume ratio , hexagonal crystal system , nanotechnology , optics , optoelectronics , chemistry , crystallography , physics , thermodynamics
The effects of the nanocrystal size on the emission spectra and decay rates of upconverting hexagonal NaYF(4):Yb,Er nanocrystals are investigated. The influence of nanocrystal size is represented in terms of the surface area/volume ratio (SA/Vol). Our results show that a small nanocrystal size, or large SA/Vol ratio increases the decay rate, in particular, the green luminescence decay rate varies linearly with the SA/Vol ratio.