Microscopic origin of the fast blue-green luminescence of chemically synthesized non-oxidized silicon quantum dots.
The microscopic origin of the bright nanosecond blue-green photoluminescence (PL), frequently reported for synthesized organically terminated Si quantum dots (Si-QDs), has not been fully resolved, hampering potential applications of this interesting material. Here a comprehensive study of the PL from alkyl-terminated Si-QDs of 2-3 nm size, prepared by wet chemical synthesis is reported. Results obtained on the ensemble and those from the single nano-object level are compared, and they provide conclusive evidence that efficient and tunable emission arises due to radiative recombination of electron-hole pairs confined in the Si-QDs. This understanding paves the way towards applications of chemical synthesis for the development of Si-QDs with tunable sizes and bandgaps.
Van der Waals-Zeeman Institute, University of Amsterdam, Science Park 904, Amsterdam, NL-1098 XH, The Netherlands. k.dohnalova@uva.nl
Kateřina
K
Dohnalová
Anna
A
Fučíková
Chinnaswamy P
CP
Umesh
Jana
J
Humpolíčková
Jos M J
JM
Paulusse
Jan
J
Valenta
Han
H
Zuilhof
Martin
M
Hof
Tom
T
Gregorkiewicz