2011 - Europe Direct Iasi

R.27.
Title
EUROINVENT 2011
New colloidal synthesis route of high quality CdSe
fluorescent quantum dots with tunable emission in the
visible spectrum
Authors Cornel S.Stan, Laura Chirilă, Ion Roșca
Institution
Description
“Gheorghe Asachi” Technical University of Iasi,
Faculty of Chemical Engineering and Environmental
Protection, Faculty of Textile, Leather and Industrial
Management
A new colloidal synthesis route was investigated in order
to obtain fluorescent cadmium selenide quantum dots with
more than 40% quantum yields and size tunable emission
in the visible spectrum. Long chain aliphatic
monocarboxylic acids are used in the first stage for the
preparation of the cadmium precursor and then as capping
ligands of the synthesized quantum dots. The method
eliminates the use of a heat transfer fluid and could be
easily scaled up for large quantities production, due its
main advantages: reduction both in number and quantity
of the required precursors, low cost and moderate toxicity
raw materials, important energy savings by lower
temperature requirements on a synthesis cycle and higher
efficiency of the entire process, simplified separation and
purification procedures of the synthesized CdSe QD’s.
The size of the synthesized CdSe NC’s is situated in 3-10
nm range and could be easily controlled by changing some
of the synthesis parameters. The absorption spectrum is
situated in near UV (370 – 400 nm range) and the
fluorescence emission with low FWHM (full width of half
maximum) is situated in the entire visible spectrum,
depending on the size of the nanocrystals. The new
synthesis method was extensively tested at laboratory
scale with very good results.
Innovative Researches
153