128 research outputs found
Photothermal Absorption Spectroscopy of Individual Semiconductor Nanocrystals
Photothermal heterodyne detection is used to record the first
room-temperature absorption spectra of single CdSe/ZnS semiconductor
nanocrystals. These spectra are recorded in the high cw excitation regime, and
the observed bands are assigned to transitions involving biexciton and trion
states. Comparison with the single nanocrystals photoluminescence spectra leads
to the measurement of spectral Stokes shifts free from ensemble averaging
Enhanced Performance of Quantum Dot-Based Light-Emitting Diodes with Gold Nanoparticle-Doped Hole Injection Layer
Effect of correlation and dielectric confinement on 1S1/2(e)nS3/2(h)Excitons in CdTe/CdSe and CdSe/CdTe Type-II quantum dots
Controlled reduction of graphene oxide is an alternative and promising method to tune the electronic and optically active energy gap of this two-dimensional material in the energy range of the visible light spectrum. By means of ab initio calculations, based on hybrid density functional theory, that combine the Hartree–Fock method with the generalized gradient approximation (GGA), we investigated the electronic, optical, and radiative recombination properties of partially reduced graphene oxide, modelled as small islands of pristine graphene formed in an infinite sheet of graphene oxide. We predict that tuning of optically active gaps, in the wide range from ∼6.5 eV to ∼0.25 eV, followed by the electron radiative transition times in the range from ns to μs, can be effected by controlling the level of oxidization
Semiconductor Nanocrystal Quantum Dot Synthesis Approaches Towards Large-Scale Industrial Production for Energy Applications
Investigations of local currents in a semiconductor by single-molecule spectroscopy
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