Time- and polarization-resolved optical spectroscopy of colloidal CdSe nanocrystal quantum dots in high magnetic fields

Article Abstract:

The spin polarization of excitons in colloidal CdSe nanocrystal quantum dots (NQDs) is studied via polarization analysis of the static and time-resolved photoluminescence (PL). Time resolved studies show that magnetic field induced mixing of dark and bright exciton states leads to markedly reduced exciton lifetimes, quite similar to the effects of thermal excitation from dark to bright exciton states due to increased temperature.

Analysis, Optical spectrometers, Polarization (Light)

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Dynamics within the exciton fine structure of colloidal CdSe quantum dots

Article Abstract:

The evidence for an interaction between the quantum dot exciton fine structure states F= plusmn1 is obtained by measuring the dynamics of transition among those states, exciton spin relaxation or flipping. The results for colloidal Cdse quantum dots revealed strong size dependence for the exciton spin relaxation, consistent with its origin being attributed to a long-range contribution to the electron-hole exchange interaction.

All Other Miscellaneous Chemical Product and Preparation Manufacturing, Chemical preparations, not elsewhere classified, Colloids, Colloids & Related Products, Exciton theory, Excitons, Atomic properties

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Unraveling internal structures of highly luminescent PbSe nanocrystallites using variable-energy synchrotron radiation photoelectron spectroscopy

Article Abstract:

The internal structure of PbSe nanocrystals is deduced using synchrotron X-ray photoemission spectroscopy for three different sizes of nanocrystals. The photoemission data reveals the layered structure of PbSe nanocrystals with the crystalline PbSe core surrounded by a nonstoichiometric [Pb.sub.1-x]Se shell, finally passivated by a capping agent in the outermost layer.

Lead compounds, Photoelectron spectroscopy

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