Defect Centers In Diamond Research Articles

Persistent spectral hole burning of colour centres in diamond

Four zero-phonon lines of defect centres in diamond (GR1 (741 nm), N-V (637 nm), H4 (496 nm) and N3 (415 nm)) have been shown to exhibit persistent spectral hole burning. The phenomenon appears to be a rather general one in diamond and should prove very powerful for elucidation of the nature of defect centres. As an example, preliminary results for the N-V centre suggest a previously undetected splitting of the excited state.

Photoluminescence associated with the 1.673, 1.944 and 2.498 eV centres in diamond

Measurements are reported of photoluminescence from three defect centres in diamond which have characteristic absorption and emission lines at 1.673 eV, 1.944 eV and 2.498 eV respectively. When excited with plane polarized light the emission from the 1.673 eV centre was found to be unpolarized in agreement with a centre possessing tetrahedral symmetry. Analysis of the polarization of emission of the other centres suggests that the symmetry of the 1.944 eV centre is either monoclinic I or trigonal, and that of the 2.498 eV centre is monoclinic I. A comparison of the absorption and excitation spectra indicates that the lines at 2.887 eV and 2.954 eV and a broad absorption extending from 2.8 eV to higher energies are all associated with the 1.673 eV defect.