Detection of bright trion states using the fine structure emission of single CdSe/ZnS colloidal quantum dots.
We report direct observation of the lowest two states of the band-edge exciton fine structure in the photoluminescence from single CdSe/ZnS core/shell nanocrystals at cryogenic temperatures. The temperature dependence of this spectral fingerprint reveals exciton spin relaxation rates as low as 10 micros(-1). The fine structure is also dependent on the nanocrystal charge state facilitating the identification of a bright negatively charged trion state with a quantum yield comparable to that of neutral emission.
Fernée
Mark J
MJ
Centre for Quantum Computer Technology, School of Physical Sciences, The University of Queensland, Queensland, Australia. fernee@physics.uq.edu.au
Littleton
Bradley N
BN
Rubinsztein-Dunlop
Halina
H