Spin-Polarizable Excitonic Luminescence in Colloidal Mn(2+)-Doped CdSe Quantum Dots.
March 16th, 2008 | by admin |Spin-Polarizable Excitonic Luminescence in Colloidal Mn(2+)-Doped CdSe Quantum Dots.
The photoluminescence of colloidal Mn (2+)-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 Mn (2+) 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 R, Archer PI, Liu X, Lee S, Salley GM, Dobrowolska M, Furdyna JK, Gamelin DR.
Department of Chemistry, University of Washington, Seattle, Washington 98195, Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556, and Department of Physics, Korea University, Seoul 136-701, Republic of Korea.