Spin-polarizable excitonic luminescence in colloidal Mn2+-doped CdSe quantum dots.
The photoluminescence of colloidal Mn2+-doped CdSe nanocrystals has been studied as a function of nanocrystal diameter. These nanocrystals are shown to be unique among colloidal doped semiconductor nanocrystals reported to date in that quantum confinement allows tuning of the CdSe bandgap energy across the Mn2+ excited-state energies. At small diameters, the nanocrystal photoluminescence is dominated by Mn 2+ emission. At large diameters, CdSe excitonic photoluminescence dominates. The latter scenario has allowed spin-polarized excitonic photoluminescence to be observed in colloidal doped semiconductor nanocrystals for the first time.
Beaulac
Rémi
R
Department of Chemistry, University of Washington, Seattle, WA 98195, USA.
Archer
Paul I
PI
Liu
Xinyu
X
Lee
Sanghoon
S
Salley
G Mackay
GM
Dobrowolska
Margaret
M
Furdyna
Jacek K
JK
Gamelin
Daniel R
DR