CdSe/AsS core-shell quantum dots: preparation and two-photon fluorescence.
Arsenic(II) sulfide (AsS)-coated CdSe core-shell nanocrystals can be prepared by a cluster-complex deposition approach under mild conditions. At 60 degrees C, growth of an AsS shell onto a CdSe nanocrystal can be realized through the crystallization of a cluster complex of AsS/butylamine in a mixed solvent of isopropanol/chloroform. The new, type I core-shell nanocrystal exhibits markedly enhanced one-photon fluorescence as well two-photon upconversion fluorescence. The nanocrystals can be used for infrared-excited upconversion cellular labeling.
Wang
Junzhong
J
Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543, Singapore.
Lin
Ming
M
Yan
Yongli
Y
Wang
Zhe
Z
Ho
Paul C
PC
Loh
Kian Ping
KP