Journal
CHEMICAL SCIENCE
Volume 3, Issue 6, Pages 2028-2034Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c2sc00561a
Keywords
-
Categories
Funding
- NSF-MRSEC [DMR-0117795]
- Harrison Spectroscopy Laboratory
- MIT-Harvard NIH Center for Cancer Nanotechnology Excellence [1U54-CA119349]
- Army Research Office [W911NF-06-1-0101]
- National Science Foundation
Ask authors/readers for more resources
We report single-particle photoluminescence (PL) intermittency (blinking) with high on-time fractions in colloidal CdSe quantum dots (QD) with conformal CdS shells of 1.4 nm thickness, equivalent to approximately 4 CdS monolayers. All QDs observed displayed on-time fractions >60% with the majority >80%. The high on-time fraction blinking is accompanied by fluorescence quantum yields (QY) close to unity (up to 98% in an absolute QY measurement) when dispersed in organic solvents and a monoexponential ensemble photoluminescence (PL) decay lifetime. The CdS shell is formed in high synthetic yield using a modified selective ion layer adsorption and reaction (SILAR) technique that employs a silylated sulfur precursor. The CdS shell provides sufficient chemical and electronic passivation of the QD excited state to permit water solubilization with greater than 60% QY via ligand exchange with an imidazole-bearing hydrophilic polymer.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available