Spatially and Spectrally Resolved Cathodoluminescence of Hot-Filament Chemical-Vapor-Deposited Diamond Particles
NATIONAL INST OF STANDARDS AND TECHNOLOGY GAITHERSBURG MD CERAMICS DIV
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Spectrally resolved cathodoluminescence CL image and spatially resolved CL spectra were obtained from two specimens grown by hot-filament chemical vapor deposition. Each specimen consisted of a large number of unconnected diamond particles with cubo-octahedral and pseudo-five-fold twinned growth habits. The growth temperature was nominally 600 C for one specimen and 750 deg C for the other. In the 1.5-3.5 eV range, the spectra are composed of four defect and impurity related bands there are three bands with zero-phonon lines at 1.68 eV, 2.156 eV, and 2.325 eV, and one broad band centered at 2.85 eV. A weak peak at 5.27 eV, due to exciton recombination, was also observed. Spectrally resolved images of the two most intense CL bands, at 2.156 eV and 2. 85 eV, were obtained for several particles.
- Atomic and Molecular Physics and Spectroscopy