Electron–hole drops in synthetic diamond

Basic Properties of Diamond: Phonon Spectra, Thermal Properties, Band Structure

“…The decay time of the condensate, measured as ∼1 ps at 15 K, is significantly shorter than the lifetime (2.3 µs quoted above) of the free exciton, and is consistent with quenching by the Auger process [102]. In 13 C, luminescence from the electron-hole condensate is shifted by about 14 meV relative to 12 C, as expected from Equation (1.47) [103]. A thorough account of the electron-hole condensate is given by Sauer et al [104].…”

“…The electron-hole attraction lowers the available electronic energy relative to the 5.49 eV energy gap by an amount that depends on the concentration of the electrons and holes, and hence on the excitation power. Luminescence, which grows rapidly with excitation power, is then observed in the range 5.1 to 5.25 eV, involving the transverse-optic phonon [103]. The concentration of electrons and holes in the condensate depends on the excitation and temperature, but is of the order of 10 20 cm −3 [102,103].…”

“…Luminescence, which grows rapidly with excitation power, is then observed in the range 5.1 to 5.25 eV, involving the transverse-optic phonon [103]. The concentration of electrons and holes in the condensate depends on the excitation and temperature, but is of the order of 10 20 cm −3 [102,103]. The decay time of the condensate, measured as ∼1 ps at 15 K, is significantly shorter than the lifetime (2.3 µs quoted above) of the free exciton, and is consistent with quenching by the Auger process [102].…”

Excitonic emission and N‐ and B‐incorporation in homoepitaxial CVD‐grown diamond investigated by cathodoluminescence

“…Focusing the discussion only on the behaviour of three excitonic peaks, the FE TA peak is present only in the r6 region where the other peaks are not present. This is quite unexpected since the FE TA /FE TO ratio is around 5x10 -2 on the (001) surface [14,15]. On the contrary, in the r4 and r5 regions, the intensity of BE TO spectral feature is shown to have a comparable importance to that of the FE TO peak.…”

“…Moreover, two features related to the exciton emission can be commented: (i) the FE TO peaks are wider on the low wavelength (high energy) side, while they are almost symmetrical at low temperature for IIa crystals and diamond films [14][15][16]. This kind of highly non symmetrical shape is obtained for the FE TO from the Ib substrate [17].…”