The effects of nitrogen and boron doping on the optical emission and diameters of single-walled carbon nanotubes
Carbon 44:13 (2006) 2752-2757
Abstract:
Using TEM, absorption and photoluminescence-excitation spectroscopy we have shown that nitrogen and nitrogen/boron doping of single-walled carbon nanotubes produce significant changes in both the optical properties and the diameter distribution of nanotubes produced by the arc-discharge method. Smaller diameter tubes are preferentially formed in the presence of boron. In addition the presence of nitrogen is found to significantly affect the emission properties of the nanotube ensemble, causing a shift in the dominant emission to lower energies, possibly due to changes in the bundling structure of the nanotubes in solution, but only very small changes are observed in the emission energies for individual nanotubes. © 2006 Elsevier Ltd. All rights reserved.PL, magneto-PL and PLE of the trimetallic nitride template fullerene Er3N@C-80
PHYS STATUS SOLIDI B 243:13 (2006) 3037-3041
Abstract:
Er3N@C,, exhibits sharp optical emission lines in the near-infrared attributed to fluorescence from the Er3+ ion. Here we demonstrate that high magnetic fields cause this spectrum to split, corresponding to transitions from the lowest field-split Kramers doublet of the I-4(13/2) manifold to the four lowest field-split levels of the I-4(15/2) manifold. The internal structure of these fullerenes can be spatially aligned with a preferred orientation under high magnetic field; the effect of alignment is to reduce the broadening associated with the isotropic spatial averaging characteristic of powder or frozen-solution spectra. Using a tunable 1.5 mu m laser, we directly observe non-cage-mediated optical interactions with the Er3+ ion. This spectroscopic method provides the opportunity to map the energy level structure of the incarcerated ion and to coherently control its quantum state. These qualities suggest that rare-earth endohedral fullerenes have characteristics that could be employed as a readout pathway for fullerene-based quantum information processing.The effects of nitrogen and boron doping on the optical emission and diameters of single-walled carbon nanotubes
Carbon Elsevier BV 44:13 (2006) 2752-2757
Direct optical excitation of a fullerene-incarcerated metal ion
Chemical Physics Letters 428:4-6 (2006) 303-306
Abstract:
The endohedral fullerene Er3N@C80 shows characteristic 1.5 μm photoluminescence at cryogenic temperatures associated with radiative relaxation from the crystal-field split Er3+ 4I13/2 manifold to the 4I15/2 manifold. Previous observations of this luminescence were carried out by photoexcitation of the fullerene cage states leading to relaxation via the ionic states. We present direct non-cage-mediated optical interaction with the erbium ion. We have used this interaction to complete a photoluminescence-excitation map of the Er3+ 4I13/2 manifold. This ability to interact directly with the states of an incarcerated ion suggests the possibility of coherently manipulating fullerene qubit states with light. © 2006 Elsevier B.V. All rights reserved.Surface investigation of a cubic AIN buffer layer and GaN grown on Si (111) and Si (100) as revealed by atomic force microscopy
Journal of the Korean Physical Society 49:3 (2006) 1092-1096