Luminescent Characteristics of Needle-Like Single Crystal Diamondsстатья
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Дата последнего поиска статьи во внешних источниках: 26 февраля 2018 г.
Аннотация:Luminescent properties of needle-like single crystal diamonds are investigated
in a wide range of wavelength. The luminescent spectra with zero
phonon lines centered at 389, 442, 468, 534, 563, 575, and 738nm are
detected using excitation by photons and electrons. Obtained photo- and
cathodo-luminescent (PL and CL) spectra indicate presence in the singlecrystal
diamond needles of nitrogen- and silicon-vacancy centers as well as
substitutional or/and interstitials related to these atomic impurities. The
dependencies of PL intensities of the 575 and 738nm lines (related,
correspondingly, to nitrogen- and silicon-vacancy centers) on excitation
wavelength are determined. Time-resolved measurements are performed for
the 575nm PL line. The luminescence decay behavior for this line
demonstrates the presence of recombination processes with characteristic
times of about 28 ns (on 200 ns time scale) and 2.8 ns (on 20 ns time scale).